At Klaviyo, we value the unique backgrounds, experiences and perspectives each Klaviyo (we call ourselves Klaviyos) brings to our workplace each and every day. We believe everyone deserves a fair shot at success and appreciate the experiences each person brings beyond the traditional job requirements. Lead Software AI Engineer: We believe the future of software lies not in productivity tools for human users but in software that can run and optimize itself based on outcome or reward metrics. We've built the infrastructure and application that serve as the interface between businesses and consumers. We now have over 167,000 customers, billions of consumer profiles, and hundreds of billions of customer messages and follow-on conversion data. As a Lead Software AI Engineer at Klaviyo, you'll set technical direction and drive the design of scalable backend systems and AI-powered user experiences that form the foundation of our AI product strategy. You'll work closely with product managers, machine learning engineers, and data scientists while mentoring engineers and shaping architectural decisions. How You Will Make a Difference Lead the design and development of backend systems that enable scalable AI solutions for 167K+ customers. Architect robust, reliable, and scalable data pipelines that train and serve AI/ML models at scale. Drive the integration of LLMs into production systems, powering AI agents that create and execute real-time customer experiences. Establish best practices for model evaluation, monitoring, and performance across generative and agentic AI use cases. Mentor and guide engineers, fostering a culture of technical excellence, ownership, and customer-centric product thinking. Partner with cross-functional leaders to influence AI product strategy and deliver high-impact solutions. Who You Are 7-10 years of professional software engineering experience, with a strong focus on backend systems and distributed architectures. Recent, hands-on experience with AI/ML and LLMs, including fine-tuning, evaluation, and production deployment. Proven ability to design and scale distributed systems that support AI-driven applications and agent capabilities. Proficient in Python and modern backend frameworks (FastAPI, Django preferred). Skilled with big data tools (Apache Spark, Hadoop) and distributed task queues (Kafka, Celery, SQS, RabbitMQ, Redis). Experienced in architecting APIs and cloud-native solutions (AWS, Kubernetes, CI/CD pipelines). Demonstrated technical leadership - mentoring engineers, shaping architecture, and raising the bar for engineering practices. Thrives in a fast-paced, startup-like environment with high autonomy and ownership. Curious, adaptable, and motivated to stay on the cutting edge of AI/ML research and apply it to real-world business challenges. Nice to Have Experience training and deploying reinforcement learning systems. Prior experience leading cross-functional initiatives involving data science, ML engineering, and product. Klaviyo is committed to a policy of equal opportunity and non-discrimination. We do not discriminate on the basis of race, ethnicity, citizenship, national origin, color, religion or religious creed, age, sex (including pregnancy), gender identity, sexual orientation, physical or mental disability, veteran or active military status, marital status, criminal record, genetics, retaliation, sexual harassment or any other characteristic protected by applicable law.
04/02/2026
Full time
At Klaviyo, we value the unique backgrounds, experiences and perspectives each Klaviyo (we call ourselves Klaviyos) brings to our workplace each and every day. We believe everyone deserves a fair shot at success and appreciate the experiences each person brings beyond the traditional job requirements. Lead Software AI Engineer: We believe the future of software lies not in productivity tools for human users but in software that can run and optimize itself based on outcome or reward metrics. We've built the infrastructure and application that serve as the interface between businesses and consumers. We now have over 167,000 customers, billions of consumer profiles, and hundreds of billions of customer messages and follow-on conversion data. As a Lead Software AI Engineer at Klaviyo, you'll set technical direction and drive the design of scalable backend systems and AI-powered user experiences that form the foundation of our AI product strategy. You'll work closely with product managers, machine learning engineers, and data scientists while mentoring engineers and shaping architectural decisions. How You Will Make a Difference Lead the design and development of backend systems that enable scalable AI solutions for 167K+ customers. Architect robust, reliable, and scalable data pipelines that train and serve AI/ML models at scale. Drive the integration of LLMs into production systems, powering AI agents that create and execute real-time customer experiences. Establish best practices for model evaluation, monitoring, and performance across generative and agentic AI use cases. Mentor and guide engineers, fostering a culture of technical excellence, ownership, and customer-centric product thinking. Partner with cross-functional leaders to influence AI product strategy and deliver high-impact solutions. Who You Are 7-10 years of professional software engineering experience, with a strong focus on backend systems and distributed architectures. Recent, hands-on experience with AI/ML and LLMs, including fine-tuning, evaluation, and production deployment. Proven ability to design and scale distributed systems that support AI-driven applications and agent capabilities. Proficient in Python and modern backend frameworks (FastAPI, Django preferred). Skilled with big data tools (Apache Spark, Hadoop) and distributed task queues (Kafka, Celery, SQS, RabbitMQ, Redis). Experienced in architecting APIs and cloud-native solutions (AWS, Kubernetes, CI/CD pipelines). Demonstrated technical leadership - mentoring engineers, shaping architecture, and raising the bar for engineering practices. Thrives in a fast-paced, startup-like environment with high autonomy and ownership. Curious, adaptable, and motivated to stay on the cutting edge of AI/ML research and apply it to real-world business challenges. Nice to Have Experience training and deploying reinforcement learning systems. Prior experience leading cross-functional initiatives involving data science, ML engineering, and product. Klaviyo is committed to a policy of equal opportunity and non-discrimination. We do not discriminate on the basis of race, ethnicity, citizenship, national origin, color, religion or religious creed, age, sex (including pregnancy), gender identity, sexual orientation, physical or mental disability, veteran or active military status, marital status, criminal record, genetics, retaliation, sexual harassment or any other characteristic protected by applicable law.
Senior Security Engineer, Cloud Infrastructure Join to apply for the Senior Security Engineer, Cloud Infrastructure role at Klaviyo We're Klaviyo (pronounced clay-vee oh). We empower creators to own their destiny by making first party data accessible and actionable like never before. We see limitless potential for the technology we're developing to nurture personalized experiences in ecommerce and beyond. To reach our goals, we need our own crew of remarkable creators-ambitious and collaborative teammates who stay focused on our north star: delighting our customers. If you're ready to do the best work of your career, where you'll be welcomed as your whole self from day one and supported with generous benefits, we hope you'll join us. As a Senior Security Engineer, you'll be a vital part of the Infrastructure Security Team, focusing on strengthening the security posture across Klaviyo's entire technology environment. Unlike roles with a narrowly defined specialty, this position offers the opportunity to demonstrate your unique expertise-whether that's in cloud security, identity and access management, data protection, secure systems design, or other security domains. Your work will involve evaluating and hardening our infrastructure, collaborating with cross functional teams, and leveraging AI to build scalable solutions to address emerging threats. We are looking for someone who is excited to bring their specialized skills to the team, shaping Klaviyo's security practices and helping us continue to raise the bar. How You Will Make a Difference Secure Klaviyo's infrastructure by designing, implementing, and maintaining scalable security controls across cloud, on prem, and hybrid environments Evaluate and improve security configurations and policies across a range of technologies, using your domain expertise to reduce risk and enable secure by default architectures Collaborate with engineering and IT teams to embed security practices across the development and deployment lifecycle Lead threat modeling, risk assessments, and architecture reviews in areas aligned with your specialty Develop automated solutions and infrastructure as code to drive consistent and reproducible security outcomes Stay ahead of the latest threats and advocate for innovative security solutions aligned with business needs Help define security standards and best practices at Klaviyo, championing their adoption across teams Who You Are Have 3+ years of experience in infrastructure or security engineering roles, with deep knowledge in one or more security focus areas (e.g., cloud security, IAM, endpoint security, data protection, detection engineering, compliance) Comfortable navigating ambiguity and defining priorities in a broad scoped role Experienced working in modern cloud environments such as AWS, GCP, or Azure Familiar with infrastructure as code tools such as Terraform, CloudFormation, or Pulumi Proficient in secure systems design, threat modeling, and vulnerability management AI Agentic development and prompt engineering, MCP (AWS Bedrock, OpenAI, Anthropic) Able to clearly articulate complex security topics to technical and non technical stakeholders Passionate about security, eager to learn from others and share your expertise Nice to have - certifications (e.g., CISSP, CKS, GCP/AWS Security certs) or equivalent practical experience Seniority level Mid Senior level Employment type Full time Job function Information Technology and Engineering Industries: Marketing Services and Data Infrastructure and Analytics Base pay range $152,000.00/yr - $228,000.00/yr This range is provided by Klaviyo. Your actual pay will be based on your skills and experience - talk with your recruiter to learn more. Referrals increase your chances of interviewing at Klaviyo by 2x
04/02/2026
Full time
Senior Security Engineer, Cloud Infrastructure Join to apply for the Senior Security Engineer, Cloud Infrastructure role at Klaviyo We're Klaviyo (pronounced clay-vee oh). We empower creators to own their destiny by making first party data accessible and actionable like never before. We see limitless potential for the technology we're developing to nurture personalized experiences in ecommerce and beyond. To reach our goals, we need our own crew of remarkable creators-ambitious and collaborative teammates who stay focused on our north star: delighting our customers. If you're ready to do the best work of your career, where you'll be welcomed as your whole self from day one and supported with generous benefits, we hope you'll join us. As a Senior Security Engineer, you'll be a vital part of the Infrastructure Security Team, focusing on strengthening the security posture across Klaviyo's entire technology environment. Unlike roles with a narrowly defined specialty, this position offers the opportunity to demonstrate your unique expertise-whether that's in cloud security, identity and access management, data protection, secure systems design, or other security domains. Your work will involve evaluating and hardening our infrastructure, collaborating with cross functional teams, and leveraging AI to build scalable solutions to address emerging threats. We are looking for someone who is excited to bring their specialized skills to the team, shaping Klaviyo's security practices and helping us continue to raise the bar. How You Will Make a Difference Secure Klaviyo's infrastructure by designing, implementing, and maintaining scalable security controls across cloud, on prem, and hybrid environments Evaluate and improve security configurations and policies across a range of technologies, using your domain expertise to reduce risk and enable secure by default architectures Collaborate with engineering and IT teams to embed security practices across the development and deployment lifecycle Lead threat modeling, risk assessments, and architecture reviews in areas aligned with your specialty Develop automated solutions and infrastructure as code to drive consistent and reproducible security outcomes Stay ahead of the latest threats and advocate for innovative security solutions aligned with business needs Help define security standards and best practices at Klaviyo, championing their adoption across teams Who You Are Have 3+ years of experience in infrastructure or security engineering roles, with deep knowledge in one or more security focus areas (e.g., cloud security, IAM, endpoint security, data protection, detection engineering, compliance) Comfortable navigating ambiguity and defining priorities in a broad scoped role Experienced working in modern cloud environments such as AWS, GCP, or Azure Familiar with infrastructure as code tools such as Terraform, CloudFormation, or Pulumi Proficient in secure systems design, threat modeling, and vulnerability management AI Agentic development and prompt engineering, MCP (AWS Bedrock, OpenAI, Anthropic) Able to clearly articulate complex security topics to technical and non technical stakeholders Passionate about security, eager to learn from others and share your expertise Nice to have - certifications (e.g., CISSP, CKS, GCP/AWS Security certs) or equivalent practical experience Seniority level Mid Senior level Employment type Full time Job function Information Technology and Engineering Industries: Marketing Services and Data Infrastructure and Analytics Base pay range $152,000.00/yr - $228,000.00/yr This range is provided by Klaviyo. Your actual pay will be based on your skills and experience - talk with your recruiter to learn more. Referrals increase your chances of interviewing at Klaviyo by 2x
A leading technology company in Boston is seeking a Senior Platform Engineer. The role focuses on developing asynchronous processing systems using Python, AWS, and Kubernetes. Responsibilities include mentoring other engineers and designing scalable systems. Ideal candidates will have substantial experience with distributed systems and cloud environments. The position offers competitive compensation and a supportive work culture.
04/02/2026
Full time
A leading technology company in Boston is seeking a Senior Platform Engineer. The role focuses on developing asynchronous processing systems using Python, AWS, and Kubernetes. Responsibilities include mentoring other engineers and designing scalable systems. Ideal candidates will have substantial experience with distributed systems and cloud environments. The position offers competitive compensation and a supportive work culture.
A leading marketing technology company in Boston, seeks a Senior Software Engineer to lead product initiatives and enhance offerings through innovative software solutions. The role demands 7+ years of software engineering expertise, a strong command of front-end and back-end technologies, and the ability to mentor team members. Ideal candidates will embrace AI tools and contribute to building smarter systems. Join in shaping the company's future through experimentation, creativity, and excellence.
04/02/2026
Full time
A leading marketing technology company in Boston, seeks a Senior Software Engineer to lead product initiatives and enhance offerings through innovative software solutions. The role demands 7+ years of software engineering expertise, a strong command of front-end and back-end technologies, and the ability to mentor team members. Ideal candidates will embrace AI tools and contribute to building smarter systems. Join in shaping the company's future through experimentation, creativity, and excellence.
Senior Software Engineer - New Product at Klaviyo 4 days ago - Be among the first 25 applicants At Klaviyo, we value the unique backgrounds, experiences, and perspectives each Klaviyo (we call ourselves Klaviyos) brings to our workplace each and every day. We believe everyone deserves a fair shot at success and appreciate the experiences each person brings beyond the traditional job requirements. If you're a close but not exact match with the description, we hope you'll still consider applying. Want to learn more about life at Klaviyo? Visit to see how we empower creators to own their own destiny. About the Role Our team is looking for a Senior Full Stack Engineer to lead key initiatives that will enhance our product offerings and support our company's growth. In this role, you'll play a crucial part in shaping outcomes by developing innovative end-to-end solutions using both front end and back end technologies. You'll optimize existing products and create new solutions that redefine what's possible for our customers. As a Senior Engineer, you'll tackle complex challenges, develop multiple solutions, and evaluate business and technical trade-offs to determine the best path forward. You'll also act as a leader and mentor, and drive key technology decisions. Additionally, you'll be responsible for deploying well designed, thoroughly tested solutions that ensure reliability and performance. The New Products team drives Klaviyo's most ambitious innovations-creating and scaling the company's boldest new bets. As a nimble group with a flat structure and fast moving culture, we prioritize simplicity, speed, and impact. Every team member is expected to take radical ownership-rolling up their sleeves, collaborating across disciplines, and pushing beyond traditional role boundaries to make things happen. Success in this role means delivering exceptional work that sets the standard for velocity and results company wide, while helping shape Klaviyo's future through experimentation, creativity, and executional excellence. What We're Looking For A proven track record of building high quality products and systems, with pride in writing clean, high quality code. 7+ years of experience in a software engineering role. Strong experience developing end to end software solutions or extensive experience with both front end and back end technologies. Experience leading projects and being accountable for their outcomes. Experience mentoring team members or driving initiatives that help the team learn new skills. Experience conducting code reviews and running a robust testing cycle. Experience working in agile, fast paced environments. You've already experimented with AI in work or personal projects, and you're excited to dive in and learn fast. You're hungry to responsibly explore new AI tools and workflows, finding ways to make your work smarter and more efficient. Transform workflows by putting AI at the center, building smarter systems and ways of working from the ground up. Nice to Have Skills with Python and related technologies Skills with React and related technologies Experience developing digital marketing or customer data software solutions. Experience with machine learning. Experience building cloud native solutions, ideally with AWS. Base Pay Range For US Locations $152,000-$228,000 USD Equal Opportunity Statement Klaviyo is committed to a policy of equal opportunity and non discrimination. We do not discriminate on the basis of race, ethnicity, citizenship, national origin, color, religion or religious creed, age, sex (including pregnancy), gender identity, sexual orientation, physical or mental disability, veteran or active military status, marital status, criminal record, genetics, retaliation, sexual harassment or any other characteristic protected by applicable law.
04/02/2026
Full time
Senior Software Engineer - New Product at Klaviyo 4 days ago - Be among the first 25 applicants At Klaviyo, we value the unique backgrounds, experiences, and perspectives each Klaviyo (we call ourselves Klaviyos) brings to our workplace each and every day. We believe everyone deserves a fair shot at success and appreciate the experiences each person brings beyond the traditional job requirements. If you're a close but not exact match with the description, we hope you'll still consider applying. Want to learn more about life at Klaviyo? Visit to see how we empower creators to own their own destiny. About the Role Our team is looking for a Senior Full Stack Engineer to lead key initiatives that will enhance our product offerings and support our company's growth. In this role, you'll play a crucial part in shaping outcomes by developing innovative end-to-end solutions using both front end and back end technologies. You'll optimize existing products and create new solutions that redefine what's possible for our customers. As a Senior Engineer, you'll tackle complex challenges, develop multiple solutions, and evaluate business and technical trade-offs to determine the best path forward. You'll also act as a leader and mentor, and drive key technology decisions. Additionally, you'll be responsible for deploying well designed, thoroughly tested solutions that ensure reliability and performance. The New Products team drives Klaviyo's most ambitious innovations-creating and scaling the company's boldest new bets. As a nimble group with a flat structure and fast moving culture, we prioritize simplicity, speed, and impact. Every team member is expected to take radical ownership-rolling up their sleeves, collaborating across disciplines, and pushing beyond traditional role boundaries to make things happen. Success in this role means delivering exceptional work that sets the standard for velocity and results company wide, while helping shape Klaviyo's future through experimentation, creativity, and executional excellence. What We're Looking For A proven track record of building high quality products and systems, with pride in writing clean, high quality code. 7+ years of experience in a software engineering role. Strong experience developing end to end software solutions or extensive experience with both front end and back end technologies. Experience leading projects and being accountable for their outcomes. Experience mentoring team members or driving initiatives that help the team learn new skills. Experience conducting code reviews and running a robust testing cycle. Experience working in agile, fast paced environments. You've already experimented with AI in work or personal projects, and you're excited to dive in and learn fast. You're hungry to responsibly explore new AI tools and workflows, finding ways to make your work smarter and more efficient. Transform workflows by putting AI at the center, building smarter systems and ways of working from the ground up. Nice to Have Skills with Python and related technologies Skills with React and related technologies Experience developing digital marketing or customer data software solutions. Experience with machine learning. Experience building cloud native solutions, ideally with AWS. Base Pay Range For US Locations $152,000-$228,000 USD Equal Opportunity Statement Klaviyo is committed to a policy of equal opportunity and non discrimination. We do not discriminate on the basis of race, ethnicity, citizenship, national origin, color, religion or religious creed, age, sex (including pregnancy), gender identity, sexual orientation, physical or mental disability, veteran or active military status, marital status, criminal record, genetics, retaliation, sexual harassment or any other characteristic protected by applicable law.
A leading AI and Analytics company is looking for a Senior Software Engineer in Boston to lead the design and implementation of scalable data pipelines powering their analytics features. As part of a cross-functional team, you will enhance workflows utilizing AI while mentoring other engineers in data best practices. Ideal candidates have 6+ years in software engineering, proficient in SQL and Python, and are experienced with data platforms. Join us to make a significant impact in a collaborative environment.
04/02/2026
Full time
A leading AI and Analytics company is looking for a Senior Software Engineer in Boston to lead the design and implementation of scalable data pipelines powering their analytics features. As part of a cross-functional team, you will enhance workflows utilizing AI while mentoring other engineers in data best practices. Ideal candidates have 6+ years in software engineering, proficient in SQL and Python, and are experienced with data platforms. Join us to make a significant impact in a collaborative environment.
As a Senior / Lead Security Engineer, you'll be a vital part of the Infrastructure Security Team, focusing on strengthening the security posture across Klaviyo's entire technology environment, developing security architectures and repeatable patterns and mentoring colleagues and junior security engineers. Unlike roles with a narrowly defined specialty, this position offers the opportunity to demonstrate your unique expertise-whether that's in cloud security, identity and access management, data protection, secure systems design, or other security domains. Your work will involve evaluating and hardening our infrastructure, collaborating with cross-functional teams, and leveraging AI to build scalable solutions to address emerging threats. We are looking for someone who is excited to bring their specialized skills to the team, shaping Klaviyo's security practices and helping us continue to raise the bar. How You Will Make a Difference Secure Klaviyo's infrastructure by designing, implementing, and maintaining scalable security controls across cloud, on-prem, and hybrid environments Evaluate and improve security configurations and policies across a range of technologies, using your domain expertise to reduce risk and enable secure-by-default architectures Collaborate with engineering and IT teams to embed security practices and develop repeatable security patterns across the development and deployment lifecycle Lead threat modeling, risk assessments, and architecture reviews in areas aligned with your specialty Develop automated solutions and infrastructure-as-code to drive consistent and reproducible security outcomes Stay ahead of the latest threats and advocate for innovative security solutions aligned with business needs Help define security standards and best practices at Klaviyo, championing their adoption across teams Who You Are Have 5+ years of experience in infrastructure or security engineering roles, with deep knowledge in one or more security focus areas (e.g., cloud security, IAM, endpoint security, data protection, detection engineering, compliance) Comfortable navigating ambiguity and defining priorities in a broad-scoped role Experienced working in modern cloud environments such as AWS, GCP, or Azure Familiar with infrastructure-as-code tools such as Terraform, CloudFormation, or Pulumi Proficient in secure systems design, threat modeling, and vulnerability management AI Agentic development and prompt engineering, MCP (AWS Bedrock, OpenAI, Anthropic) Able to clearly articulate complex security topics to technical and non-technical stakeholders Passionate about security, eager to learn from others and share your expertise Nice to have - certifications (e.g., CISSP, CKS, GCP/AWS Security certs) or equivalent practical experience At Klaviyo, we value the unique backgrounds, experiences and perspectives each Klaviyos brings to our workplace each and every day. We believe everyone deserves a fair shot at success and appreciate the experiences each person brings beyond the traditional job requirements. If you're a close but not exact match with the description, we hope you'll still consider applying. Want to learn more about life at Klaviyo? Visit to see how we empower creators to own their own destiny.
04/02/2026
Full time
As a Senior / Lead Security Engineer, you'll be a vital part of the Infrastructure Security Team, focusing on strengthening the security posture across Klaviyo's entire technology environment, developing security architectures and repeatable patterns and mentoring colleagues and junior security engineers. Unlike roles with a narrowly defined specialty, this position offers the opportunity to demonstrate your unique expertise-whether that's in cloud security, identity and access management, data protection, secure systems design, or other security domains. Your work will involve evaluating and hardening our infrastructure, collaborating with cross-functional teams, and leveraging AI to build scalable solutions to address emerging threats. We are looking for someone who is excited to bring their specialized skills to the team, shaping Klaviyo's security practices and helping us continue to raise the bar. How You Will Make a Difference Secure Klaviyo's infrastructure by designing, implementing, and maintaining scalable security controls across cloud, on-prem, and hybrid environments Evaluate and improve security configurations and policies across a range of technologies, using your domain expertise to reduce risk and enable secure-by-default architectures Collaborate with engineering and IT teams to embed security practices and develop repeatable security patterns across the development and deployment lifecycle Lead threat modeling, risk assessments, and architecture reviews in areas aligned with your specialty Develop automated solutions and infrastructure-as-code to drive consistent and reproducible security outcomes Stay ahead of the latest threats and advocate for innovative security solutions aligned with business needs Help define security standards and best practices at Klaviyo, championing their adoption across teams Who You Are Have 5+ years of experience in infrastructure or security engineering roles, with deep knowledge in one or more security focus areas (e.g., cloud security, IAM, endpoint security, data protection, detection engineering, compliance) Comfortable navigating ambiguity and defining priorities in a broad-scoped role Experienced working in modern cloud environments such as AWS, GCP, or Azure Familiar with infrastructure-as-code tools such as Terraform, CloudFormation, or Pulumi Proficient in secure systems design, threat modeling, and vulnerability management AI Agentic development and prompt engineering, MCP (AWS Bedrock, OpenAI, Anthropic) Able to clearly articulate complex security topics to technical and non-technical stakeholders Passionate about security, eager to learn from others and share your expertise Nice to have - certifications (e.g., CISSP, CKS, GCP/AWS Security certs) or equivalent practical experience At Klaviyo, we value the unique backgrounds, experiences and perspectives each Klaviyos brings to our workplace each and every day. We believe everyone deserves a fair shot at success and appreciate the experiences each person brings beyond the traditional job requirements. If you're a close but not exact match with the description, we hope you'll still consider applying. Want to learn more about life at Klaviyo? Visit to see how we empower creators to own their own destiny.
A tech-driven marketing platform in Boston is looking for a Lead Software AI Engineer to spearhead the development of scalable backend systems and AI-driven user experiences. This leadership role emphasizes collaboration with product managers and mentoring of engineers. The ideal candidate should have experience in AI/ML technologies, particularly with large language models, and a proven track record in tech leadership.
04/02/2026
Full time
A tech-driven marketing platform in Boston is looking for a Lead Software AI Engineer to spearhead the development of scalable backend systems and AI-driven user experiences. This leadership role emphasizes collaboration with product managers and mentoring of engineers. The ideal candidate should have experience in AI/ML technologies, particularly with large language models, and a proven track record in tech leadership.
A leading technology company is seeking a Senior / Lead Security Engineer to strengthen its security posture. The role involves designing security controls, evaluating security configurations, and leading risk assessments. Applicants should have over 5 years of experience in security engineering, particularly in cloud security and IAM. The position offers an opportunity to collaborate with cross-functional teams and shape security practices at the company. This role is ideal for passionate individuals eager to advance security solutions while navigating a dynamic environment.
04/02/2026
Full time
A leading technology company is seeking a Senior / Lead Security Engineer to strengthen its security posture. The role involves designing security controls, evaluating security configurations, and leading risk assessments. Applicants should have over 5 years of experience in security engineering, particularly in cloud security and IAM. The position offers an opportunity to collaborate with cross-functional teams and shape security practices at the company. This role is ideal for passionate individuals eager to advance security solutions while navigating a dynamic environment.
A leading email infrastructure company is seeking a Senior Backend Engineer to design and implement scalable email delivery systems. Candidates must have expertise in Go and experience with high-throughput distributed systems. In this role, you'll drive key components of the email pipeline, collaborate cross-functionally, and embrace AI to enhance workflows. The position offers a competitive salary range of $148,000 to $222,000, depending on skills and experience, alongside a comprehensive benefits package.
04/02/2026
Full time
A leading email infrastructure company is seeking a Senior Backend Engineer to design and implement scalable email delivery systems. Candidates must have expertise in Go and experience with high-throughput distributed systems. In this role, you'll drive key components of the email pipeline, collaborate cross-functionally, and embrace AI to enhance workflows. The position offers a competitive salary range of $148,000 to $222,000, depending on skills and experience, alongside a comprehensive benefits package.
At Klaviyo, we value the unique backgrounds, experiences and perspectives each Klaviyos brings to our workplace each and every day. We believe everyone deserves a fair shot at success and appreciate the experiences each person brings beyond the traditional job requirements. If you're a close but not exact match with the description, we hope you'll still consider applying. Want to learn more about life at Klaviyo? Visit to see how we empower creators to own their destiny. Why You Should Join The Email Platforms Team The Email Platforms team at Klaviyo is building the next generation of infrastructure to support reliable, scalable, and performant email delivery. Our mission is to help Klaviyo reach enterprise scale by evolving and owning our email sending pipeline end-to-end. We're investing heavily in our homegrown email delivery infrastructure, giving us greater control, performance, and reliability in how we deliver emails for some of the largest brands in the world. You'll join a high-impact, high-ownership team tackling technical challenges around high-throughput systems, distributed messaging, and service performance at scale. Our work directly impacts customer satisfaction and business success. If you're excited about email infrastructure, systems design, and high-scale backend development in Go, this is the role for you. How You Will Make a Difference Own and drive key components of the email pipeline architecture Design and implement scalable, high-throughput services in Go Develop systems that manage message queues and email delivery Help ensure our systems scale with customer growth, especially as we bring on larger enterprise accounts Collaborate cross-functionally to ensure the highest standards of performance, reliability, and deliverability Transform workflows by putting AI at the center, building smarter systems and ways of working from the ground up. Who You Are Senior-level backend engineer with strong systems design skills Proficient in Go (required). experience with Python is a plusExperienced working with high-throughput distributed systems Familiar with message queues (e.g., Pulsar, Kafka, RabbitMQ, SQS) Bonus: Experience with email infrastructure, MTAs, deliverability, or mailops Comfortable working independently on projects from design through production Able to thrive in a mostly remote team and deliver in a high-autonomy environment You've already experimented with AI in work or personal projects, and you're excited to dive in and learn fast. You're hungry to responsibly explore new AI tools and workflows, finding ways to make your work smarter and more efficient. Technologies We Use Languages: Go, Python Infrastructure: AWS, DynamoDB, Kubernetes, Terraform Frameworks Gin (Go), Django (Python) Messaging and Email Systems Messaging: Pulsar, Kafka, other message queues Email Systems: MTA's (GreenArrow), Proxy servers, email deliverability tools, monitoring tools We use Covey as part of our hiring and / or promotional process. For jobs or candidates in NYC, certain features may qualify it as an AEDT. As part of the evaluation process we provide Covey with job requirements and candidate submitted applications. We began using Covey Scout for Inbound on April 3, 2025. Please see the independent bias audit report covering our use of Covey here Massachusetts Applicants It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability. Our salary range reflects the cost of labor across various U.S. geographic markets. The range displayed below reflects the minimum and maximum target salaries for the position across all our US locations. The base salary offered for this position is determined by several factors, including the applicant's job-related skills, relevant experience, education or training, and work location. In addition to base salary, our total compensation package may include participation in the company's annual cash bonus plan, variable compensation (OTE) for sales and customer success roles, equity, sign on payments, and a comprehensive range of health, welfare, and wellbeing benefits based on eligibility. Your recruiter can provide more details about the specific salary/OTE range for your preferred location during the hiring process. Base Pay Range For US Locations: $148,000-$222,000 USD Get to Know Klaviyo We're Klaviyo (pronounced clay-vee oh). We empower creators to own their destiny by making first party data accessible and actionable like never before. We see limitless potential for the technology we're developing to nurture personalized experiences in ecommerce and beyond. To reach our goals, we need our own crew of remarkable creators-ambitious and collaborative teammates who stay focused on our north star: delighting our customers. If you're ready to do the best work of your career, where you'll be welcomed as your whole self from day one and supported with generous benefits, we hope you'll join us. AI fluency at Klaviyo includes responsible use of AI (including privacy, security, bias awareness, and human-in-the-loop). We provide accommodations as needed. By participating in Klaviyo's interview process, you acknowledge that you have read, understood, and will adhere to our Guidelines for using AI in the Klaviyo interview Process. For more information about how we process your personal data, see our Job Applicant Privacy Notice. Klaviyo is committed to a policy of equal opportunity and non-discrimination. We do not discriminate on the basis of race, ethnicity, citizenship, national origin, color, religion or religious creed, age, sex (including pregnancy), gender identity, sexual orientation, physical or mental disability, veteran or active military status, marital status, criminal record, genetics, retaliation, sexual harassment or any other characteristic protected by applicable law. IMPORTANT NOTICE: Our company takes the security and privacy of job applicants very seriously. We will never ask for payment, bank details, or personal financial information as part of the application process. All our legitimate job postings can be found on our official career site. Please be cautious of job offers that come from non-company email addresses instant messaging platforms, or unsolicited calls. By clicking "Submit Application" you consent to Klaviyo processing your Personal Data in accordance with our Job Applicant Privacy Notice. If you do not wish for Klaviyo to process your Personal Data, please do not submit an application. You can find our Job Applicant Privacy Notice here and here (FR).
04/02/2026
Full time
At Klaviyo, we value the unique backgrounds, experiences and perspectives each Klaviyos brings to our workplace each and every day. We believe everyone deserves a fair shot at success and appreciate the experiences each person brings beyond the traditional job requirements. If you're a close but not exact match with the description, we hope you'll still consider applying. Want to learn more about life at Klaviyo? Visit to see how we empower creators to own their destiny. Why You Should Join The Email Platforms Team The Email Platforms team at Klaviyo is building the next generation of infrastructure to support reliable, scalable, and performant email delivery. Our mission is to help Klaviyo reach enterprise scale by evolving and owning our email sending pipeline end-to-end. We're investing heavily in our homegrown email delivery infrastructure, giving us greater control, performance, and reliability in how we deliver emails for some of the largest brands in the world. You'll join a high-impact, high-ownership team tackling technical challenges around high-throughput systems, distributed messaging, and service performance at scale. Our work directly impacts customer satisfaction and business success. If you're excited about email infrastructure, systems design, and high-scale backend development in Go, this is the role for you. How You Will Make a Difference Own and drive key components of the email pipeline architecture Design and implement scalable, high-throughput services in Go Develop systems that manage message queues and email delivery Help ensure our systems scale with customer growth, especially as we bring on larger enterprise accounts Collaborate cross-functionally to ensure the highest standards of performance, reliability, and deliverability Transform workflows by putting AI at the center, building smarter systems and ways of working from the ground up. Who You Are Senior-level backend engineer with strong systems design skills Proficient in Go (required). experience with Python is a plusExperienced working with high-throughput distributed systems Familiar with message queues (e.g., Pulsar, Kafka, RabbitMQ, SQS) Bonus: Experience with email infrastructure, MTAs, deliverability, or mailops Comfortable working independently on projects from design through production Able to thrive in a mostly remote team and deliver in a high-autonomy environment You've already experimented with AI in work or personal projects, and you're excited to dive in and learn fast. You're hungry to responsibly explore new AI tools and workflows, finding ways to make your work smarter and more efficient. Technologies We Use Languages: Go, Python Infrastructure: AWS, DynamoDB, Kubernetes, Terraform Frameworks Gin (Go), Django (Python) Messaging and Email Systems Messaging: Pulsar, Kafka, other message queues Email Systems: MTA's (GreenArrow), Proxy servers, email deliverability tools, monitoring tools We use Covey as part of our hiring and / or promotional process. For jobs or candidates in NYC, certain features may qualify it as an AEDT. As part of the evaluation process we provide Covey with job requirements and candidate submitted applications. We began using Covey Scout for Inbound on April 3, 2025. Please see the independent bias audit report covering our use of Covey here Massachusetts Applicants It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability. Our salary range reflects the cost of labor across various U.S. geographic markets. The range displayed below reflects the minimum and maximum target salaries for the position across all our US locations. The base salary offered for this position is determined by several factors, including the applicant's job-related skills, relevant experience, education or training, and work location. In addition to base salary, our total compensation package may include participation in the company's annual cash bonus plan, variable compensation (OTE) for sales and customer success roles, equity, sign on payments, and a comprehensive range of health, welfare, and wellbeing benefits based on eligibility. Your recruiter can provide more details about the specific salary/OTE range for your preferred location during the hiring process. Base Pay Range For US Locations: $148,000-$222,000 USD Get to Know Klaviyo We're Klaviyo (pronounced clay-vee oh). We empower creators to own their destiny by making first party data accessible and actionable like never before. We see limitless potential for the technology we're developing to nurture personalized experiences in ecommerce and beyond. To reach our goals, we need our own crew of remarkable creators-ambitious and collaborative teammates who stay focused on our north star: delighting our customers. If you're ready to do the best work of your career, where you'll be welcomed as your whole self from day one and supported with generous benefits, we hope you'll join us. AI fluency at Klaviyo includes responsible use of AI (including privacy, security, bias awareness, and human-in-the-loop). We provide accommodations as needed. By participating in Klaviyo's interview process, you acknowledge that you have read, understood, and will adhere to our Guidelines for using AI in the Klaviyo interview Process. For more information about how we process your personal data, see our Job Applicant Privacy Notice. Klaviyo is committed to a policy of equal opportunity and non-discrimination. We do not discriminate on the basis of race, ethnicity, citizenship, national origin, color, religion or religious creed, age, sex (including pregnancy), gender identity, sexual orientation, physical or mental disability, veteran or active military status, marital status, criminal record, genetics, retaliation, sexual harassment or any other characteristic protected by applicable law. IMPORTANT NOTICE: Our company takes the security and privacy of job applicants very seriously. We will never ask for payment, bank details, or personal financial information as part of the application process. All our legitimate job postings can be found on our official career site. Please be cautious of job offers that come from non-company email addresses instant messaging platforms, or unsolicited calls. By clicking "Submit Application" you consent to Klaviyo processing your Personal Data in accordance with our Job Applicant Privacy Notice. If you do not wish for Klaviyo to process your Personal Data, please do not submit an application. You can find our Job Applicant Privacy Notice here and here (FR).