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RELOCATION ASSISTANCE: Relocation assistance may be available CLEARANCE REQUIRED FOR START: Yes CLEARANCE TYPE: Secret TRAVEL: Yes, 10% of the Time Description At Northrop Grumman, our employees have incredible opportunities to work on revolutionary systems that impact people's lives around the world today, and for generations to come. Our pioneering and inventive spirit has enabled us to be at the forefront of many technological advancements in our nation's history - from the first flight across the Atlantic Ocean, to stealth bombers, to landing on the moon. We look for people who have bold new ideas, courage and a pioneering spirit to join forces to invent the future, and have fun along the way. Our culture thrives on intellectual curiosity, cognitive diversity and bringing your whole self to work - and we have an insatiable drive to do what others think is impossible. Our employees are not only part of history, they're making history. We at Northrop Grumman Missions Systems in Woodland Hills, CA are seeking a skilled Systems Engineer with a strong understanding of requirements development, test case development, and verification and validation of those requirements. The ideal candidate should be proficient with requirements technical baseline management via IBM Rational DOORS, and act as the point of contact to the Chief Engineer and customer. Key Responsibilities: Work with a broad customer base to identify unique requirements, flow the requirements into design documentation, and work with a diverse team to build and test those requirements. Present to customers on the capabilities of current products, performance analyses, design information, and requirements verification methods. Generate, review, and manage multiple requirements sets that cover all aspects of both performance and nonperformance including mechanical interfaces, electrical interfaces, data requirements, environmental requirements, and reliability. Awareness and responsiveness to contract milestones and deliverables. Lead an Agile team to ensure the designs are sufficient to meet the system requirements. Work with various Agile teams to ensure all requirements are verified through inspection, analysis, demonstration, or test often by providing test and data reduction scripts. Provide test directions to ensure production tests and troubleshooting tests are executed correctly and resulting data conforms to requirements. This position may be filled as a Principal Systems Engineer or Senior Principal Systems Engineer Basic Qualifications - Principal Systems Engineer: Bachelor's of Science degree in STEM (Science, Technology, Engineering, Math) discipline with 5+ years of engineering experience; Master's Science degree in STEM (Science, Technology, Engineering, Math) discipline with 3+ years of engineering experience; PhD degree in STEM (Science, Technology, Engineering, Math) discipline with 1+ years of engineering experience Experience with IBM Rational DOORS Demonstrated success with: Technical baseline management Writing and updating DOORS requirements Decomposing and deriving requirements based on customer specifications Experience in System Engineering activities such as: Software requirements development Requirements development Test Case development Verification and Validation, i.e. experience running tests and documenting results Excellent written and oral communication skills including: Demonstrated experience presenting to internal and external stakeholders Demonstrated experience communicating technical information, e.g. requirements updates, test plans, integration test plans, etc. Demonstrated Experience supporting test investigations and debugging efforts Collaborating with cross-functional teams U.S. Citizenship is required Active/Current U.S. Government Secret clearance required at the time of application Ability to work onsite full-time at Woodland Hills, CA Basic Qualifications - Senior Principal Systems Engineer: Bachelor's of Science degree in STEM (Science, Technology, Engineering, Math) discipline with 8+ years of engineering experience; Master's Science degree in STEM (Science, Technology, Engineering, Math) discipline with 6+ years of engineering experience; PhD degree in STEM (Science, Technology, Engineering, Math) discipline with 4+ years of engineering experience Experience with IBM Rational DOORS Demonstrated success with: Technical baseline management Writing and updating DOORS requirements Decomposing and deriving requirements based on customer specifications Experience in System Engineering activities such as: Software requirements development Requirements development Test Case development Verification and Validation, i.e. experience running tests and documenting results Excellent written and oral communication skills including: Demonstrated experience presenting to internal and external stakeholders Demonstrated experience communicating technical information, e.g. requirements updates, test plans, integration test plans, etc. Demonstrated Experience supporting test investigations and debugging efforts Collaborating with cross-functional teams U.S. Citizenship is required Active/Current U.S. Government Secret clearance required at the time of application Ability to work onsite full-time at Woodland Hills, CA Preferred Qualifications: Experience with the following interfaces: MIL-STD-1553 Experience with ARINC-429 Experience with Ethernet Experience working in an Agile engineering team Experience with JIRA Systems Engineering experience on large, complex systems Lab and system integration experience Demonstrated experience with Model Based Systems Engineering and Cameo modeling (or equivalent) Experience with ClearQuest / ClearCase Primary Level Salary Range: $114,000.00 - $171,000.00 Secondary Level Salary Range: $142,200.00 - $213,400.00 The above salary range represents a general guideline; however, Northrop Grumman considers a number of factors when determining base salary offers such as the scope and responsibilities of the position and the candidate's experience, education, skills and current market conditions. Depending on the position, employees may be eligible for overtime, shift differential, and a discretionary bonus in addition to base pay. Annual bonuses are designed to reward individual contributions as well as allow employees to share in company results. Employees in Vice President or Director positions may be eligible for Long Term Incentives. In addition, Northrop Grumman provides a variety of benefits including health insurance coverage, life and disability insurance, savings plan, Company paid holidays and paid time off (PTO) for vacation and/or personal business. The application period for the job is estimated to be 20 days from the job posting date. However, this timeline may be shortened or extended depending on business needs and the availability of qualified candidates. Northrop Grumman is an Equal Opportunity Employer, making decisions without regard to race, color, religion, creed, sex, sexual orientation, gender identity, marital status, national origin, age, veteran status, disability, or any other protected class. For our complete EEO and pay transparency statement, please visit U.S. Citizenship is required for all positions with a government clearance and certain other restricted positions.

Our Purpose Mastercard powers economies and empowers people in 200+ countries and territories worldwide. Together with our customers, we're helping build a sustainable economy where everyone can prosper. We support a wide range of digital payments choices, making transactions secure, simple, smart and accessible. Our technology and innovation, partnerships and networks combine to deliver a unique set of products and services that help people, businesses and governments realize their greatest potential. Title and Summary Senior Site Reliability Engineer, Performance Engineering Senior Site Reliability Engineer, Performance Engineering Payment Optimization unifies multiple Mastercard capabilities to improve transaction success, reduce avoidable declines, and simplify issuer, acquirer, and merchant interactions across the payment lifecycle. The program centralizes account update orchestration and lifecycle management, leverages AI-driven optimization intelligence, and executes time-critical optimization actions while maintaining clear domain ownership and scalable boundaries. We build products for scale. The SRE & Performance Engineering team is looking for a strong, innovative engineer to help optimize and scale our suite of services. This role supports Automatic Billing Updater (ABU), which securely provides participating issuers' updated cardholder account information-such as account number and expiration date-to ABU-registered merchants. ABU helps reduce preventable card-not-present transaction declines by keeping credential-on-file and recurring payment information current throughout the issuer-cardholder relationship. In this role, you will apply your experience in API performance testing, automation, scripting, data setup, AI-assisted script generation, bottleneck discovery, performance tuning, and performance data analysis. You will contribute to capacity planning, platform resiliency, and automation practices that improve engineering velocity and operational quality. Role • Partner with site reliability engineers and performance engineers to test and tune ABU services before production release through automated test suites, system design consulting, bottleneck analysis, chaos testing, capacity planning, and launch reviews. • Build, manage, and maintain robust performance testing suites. • Measure and monitor availability, latency, throughput, performance, and overall system health; communicate test results and recommendations clearly. • Scale systems sustainably through automation and recommend changes that improve reliability, velocity, and performance. • Review production incidents, identify contributing factors, and drive solutions that reduce recurrence. • Manage project priorities, deadlines, and deliverables independently. • Approach work with an automation mindset and automate repeatable tasks wherever practical. • Apply deep technical expertise to coach and mentor technical talent. All About You • Use AI-assisted engineering tools to accelerate performance test script generation, test data preparation, log analysis, anomaly detection, and repetitive automation while validating outputs through sound engineering review. • Apply data-driven analysis, observability insights, and automation patterns to identify performance trends, isolate bottlenecks, and recommend measurable improvements to scalability and reliability. Education (preferred): Bachelor's degree in Computer Science, Computer Systems, Information Technology, or a related field, or equivalent practical experience. Minimum: • Advanced knowledge of web applications and distributed systems infrastructure. • Excellent verbal and written communication skills for audiences with varying levels of technical acumen. • Experience with performance bottleneck analysis and system design for scale. • Experience with Java Virtual Machine internals and garbage collection tuning. • Experience with one or more of the following: database internals, server or operating system internals, storage system internals, or performance scaling for related platforms. • Experience implementing automated performance regression test suites for low-latency, high-throughput financial applications. • Experience analyzing performance bottlenecks across application code, databases, cache layers, data stores, servers, networks, messaging queues, and streaming platforms. • Experience analyzing issues holistically, from edge components through application tiers and databases. • Experience working directly with internal customers, resolving issues and providing performance engineering leadership. • Working knowledge of AI-assisted development and analysis techniques, including prompt-driven script generation, automation workflow creation, test result summarization, and root cause analysis support. Preferred: • Experience with Java, Python, Scala, or other programming and scripting languages. • Experience with Bitbucket, Maven, Jenkins, Gatling, and BlazeMeter. • Experience migrating legacy on-premises testing suites to cloud-native stacks. • Experience migrating performance testing suites from LoadRunner to Gatling or BlazeMeter. • Strong software performance analysis, bottleneck identification, scaling, and automation experience. • Experience using AI-enabled tools or large language models to generate, refactor, explain, or optimize performance testing scripts, automation utilities, and troubleshooting workflows. • Experience applying AI-assisted analysis to performance metrics, logs, traces, dashboards, and incident data to identify patterns, summarize findings, and support faster remediation. • Familiarity with responsible AI practices, including validation of AI-generated outputs, protection of sensitive data, and alignment with enterprise security and compliance expectations. Skills/Abilities: • Displays initiative and ownership. • Detail-oriented and customer-focused. • Ability to multi-task and prioritize efforts. • Ability to learn new technologies quickly and apply them effectively. • Ability to leverage AI and automation tools responsibly to improve productivity, analysis quality, and consistency while maintaining sound engineering judgment. • Strong analytical mindset with the ability to translate performance data, AI-assisted insights, and operational signals into clear recommendations. • Ability to work effectively with team members across multiple geographies. • Excellent collaboration skills with cross-functional teams. • Ability to provide positive, professional support to internal and external business partners. Mastercard is a merit-based, inclusive, equal opportunity employer that considers applicants without regard to gender, gender identity, sexual orientation, race, ethnicity, disabled or veteran status, or any other characteristic protected by law. We hire the most qualified candidate for the role. In the US or Canada, if you require accommodations or assistance to complete the online application process or during the recruitment process, please contact and identify the type of accommodation or assistance you are requesting. Do not include any medical or health information in this email. The Reasonable Accommodations team will respond to your email promptly. Corporate Security Responsibility All activities involving access to Mastercard assets, information, and networks comes with an inherent risk to the organization and, therefore, it is expected that every person working for, or on behalf of, Mastercard is responsible for information security and must: Abide by Mastercard's security policies and practices; Ensure the confidentiality and integrity of the information being accessed; Report any suspected information security violation or breach, and Complete all periodic mandatory security trainings in accordance with Mastercard's guidelines. In line with Mastercard's total compensation philosophy and assuming that the job will be performed in the US, the successful candidate will be offered a competitive base salary and may be eligible for an annual bonus or commissions depending on the role. The base salary offered may vary depending on multiple factors, including but not limited to location, job-related knowledge, skills, and experience. Mastercard benefits for full time (and certain part time) employees generally include: insurance (including medical, prescription drug, dental, vision, disability, life insurance); flexible spending account and health savings account; paid leaves (including 16 weeks of new parent leave and up to 20 days of bereavement leave); 80 hours of Paid Sick and Safe Time, 25 days of vacation time and 5 personal days, pro-rated based on date of hire; 10 annual paid U.S. observed holidays; 401k with a best-in-class company match; deferred compensation for eligible roles; fitness reimbursement or on-site fitness facilities; eligibility for tuition reimbursement; and many more. Mastercard benefits for interns generally include: 56 hours of Paid Sick and Safe Time; jury duty leave; and on-site fitness facilities in some locations. Pay Ranges O'Fallon, Missouri: $96,000 - $163,000 USD

Our Purpose Mastercard powers economies and empowers people in 200+ countries and territories worldwide. Together with our customers, we're helping build a sustainable economy where everyone can prosper. We support a wide range of digital payments choices, making transactions secure, simple, smart and accessible. Our technology and innovation, partnerships and networks combine to deliver a unique set of products and services that help people, businesses and governments realize their greatest potential. Title and Summary Senior Site Reliability Engineer Who is Mastercard? At Mastercard technology, we work to connect and power an inclusive, digital economy that benefits everyone, everywhere, by making transactions safe, simple, smart, and accessible. Using secure data and networks, partnerships, and passion, our innovations and solutions help individuals, financial institutions, governments, and businesses realize their greatest potential. Our decency quotient, or DQ, drives our culture and everything we do inside and outside of our company. We cultivate a culture of inclusion for all employees that respects their individual strengths, views, and experiences. We believe that our differences enable us to be a better team - one that makes better decisions, drives innovation, and delivers better business results. Technology at Mastercard What we create today will define tomorrow. Revolutionary technologies that reshape the digital economy to be more connected and inclusive than ever before. Safer, faster, more sustainable. And we need the best people to do it. Technologists who are energized by the challenges of a truly global network. With the talent and vision to create the critical systems and products that power global commerce and connect people everywhere to the vital goods and services they need every day. Working at Mastercard means being part of a unique culture. Inclusive and diverse, a rich collaboration of ideas and perspectives. A place that celebrates your strengths, values your experiences, and offers you the flexibility to shape a career across disciplines and continents. And the opportunity to work alongside experts and leaders at every level of the business, improving what exists, and inventing what's next. About the Role The Business Operations team is seeking a highly motivated and experienced Senior Site Reliability Engineer (SRE) to join our team. You will play a critical role in ensuring the reliability, scalability, and performance of our applications, supporting essential services that power Mastercard's global operations. As a thought leader in your field, you will bring technical expertise, a passion for automation, and the ability to mentor. The role of the Business Operations Site Reliability Engineer is to be the production readiness steward for Mastercard products. As Business Operations SRE, we are responsible for ensuring that our platform is stable and healthy. We break down barriers to running our products by fostering developer run ownership and empowering developers to build resilient products. We support our developers during the application build phase in software run principles that include operational design, automation, capacity planning, and monitoring that leads to fault-tolerant, scalable products. We see the big picture and help create and enforce operations standards while facilitating an agile and learning culture. We support daily operations with a hyper focus on triage, root cause by understanding the business impact of our products and subsequently performing blameless post-mortems. The goal of every Business Operations team is to engage early in the development lifecycle to be more proactive and upfront in the development process, and to proactively manage production and change activities to maximize customer experience and increase the overall value of supported applications. Business Operations teams also focus on risk management by tying all our activities together with an overarching responsibility for compliance and risk mitigation across all our environments. Ultimately, the role of Business Operations is to align Product and Customer Focused priorities with Operational needs by providing continuous feedback throughout the lifecycle. As part of the Business Operations team, you will: • Independently execute key elements of projects/processes within the Site Reliability Engineering area by applying in-depth knowledge of their discipline and area best practices to effectively resolve problems and roadblocks as they occur. • Assist in evaluating operational requirements and developing technical solutions within existing frameworks. • Support automation and scripting efforts to improve operational workflows and incident response processes. • Troubleshoot and resolve routine and some complex system issues, escalating when necessary to maintain system health. • Contribute to documentation, knowledge sharing, and best practices to enhance team operational procedures. • Collaborate with development teams and stakeholders to ensure reliability solutions align with technical and business needs. • Participate in reviews and quality assurance activities to uphold system stability standards. • May contribute to solution development for new products/services and/or manage smaller project/initiatives as an experienced individual contributor with specialized knowledge within the Site Reliability Engineering area. Role qualifications: The ideal candidate will apply the following skills independently in routine and moderately complex situations, requiring occasional guidance typically only in unfamiliar or highly complex scenarios. They will demonstrate growing consistency and reliability in applying the skills. • Observability - Ability to use scripting and tooling to implement observability solutions, enabling the collection, analysis, and visualization of metrics, logs, and traces to support incident detection, diagnosis, and continuous service improvement. • Programming and Scripting - Ability to write and maintain code and scripts to automate tasks, build operational tools, and support monitoring, deployment, and incident response using languages such as Python, Go, Bash, or similar. • Systems and Network Administration - Ability to configure, operate, and troubleshoot Linux/Unix systems and network components, applying knowledge of networking concepts, protocols, security, and system reliability. • Cloud Computing and Infrastructure - Ability to design, deploy, and manage applications and infrastructure on cloud platforms (e.g., AWS, Azure, GCP), ensuring scalability, security, availability, and operational efficiency. • Reliability and Scalability - Ability to design and operate systems for high availability, fault tolerance, and disaster recovery, while ensuring systems can scale to meet current and future demand • DevOps Practices - Ability to apply DevOps principles and practices, including CI/CD pipelines, containerization, and orchestration, to enable faster, more reliable software delivery and operations. • Troubleshooting - Capability to systematically identify, diagnose, and resolve technical issues across systems, applications, and networks, using analytical methods and tools to restore functionality, minimize disruption, and ensure stable operations. • Capacity Planning and Performance Optimization - Ability to monitor resource utilization, forecast future capacity needs, and optimize system performance to support growth, scalability, and efficient infrastructure usage. • IT Service Management - Ability to apply IT service management principles to incident, problem, and change management, ensuring reliable service delivery, effective incident response, and continuous service improvement aligned to business needs. • Proactive Monitoring and Improvement (SRE Applications) - The ability to use application reliability signals to anticipate issues, identify risks, and drive preventative improvements that enhance application performance and availability. Mastercard is a merit-based, inclusive, equal opportunity employer that considers applicants without regard to gender, gender identity, sexual orientation, race, ethnicity, disabled or veteran status, or any other characteristic protected by law. We hire the most qualified candidate for the role. In the US or Canada, if you require accommodations or assistance to complete the online application process or during the recruitment process, please contact and identify the type of accommodation or assistance you are requesting. Do not include any medical or health information in this email. The Reasonable Accommodations team will respond to your email promptly. Corporate Security Responsibility All activities involving access to Mastercard assets, information, and networks comes with an inherent risk to the organization and, therefore, it is expected that every person working for, or on behalf of, Mastercard is responsible for information security and must: Abide by Mastercard's security policies and practices; Ensure the confidentiality and integrity of the information being accessed; Report any suspected information security violation or breach, and Complete all periodic mandatory security trainings in accordance with Mastercard's guidelines. In line with Mastercard's total compensation philosophy and assuming that the job will be performed in the US, the successful candidate will be offered a competitive base salary and may be eligible for an annual bonus or commissions depending on the role . click apply for full job details