Job Description
Principal Software Engineer - C#/.NET Core & AWS AI-Enabled Platforms $200,000 - $240,000 + bonus & RSUs Hybrid (3-days in office)
I'm recruiting for a global leader in professional information and enterprise software, and they need a hands-on Principal Engineer to help modernise a major U.S. tax compliance platform.
The opportunity
This is a true Principal IC role: you'll own architecture and technical direction for large-scale production systems, shape decisions across multiple engineering teams, and stay close to the code. No ivory tower.
What you'll do
- Own architecture and system design for complex, high-scale platforms, balancing scalability, reliability, performance and security
- Build production software in C#/.NET Core on AWS, staying hands-on in design, delivery and problem-solving
- Lead the move from legacy applications to cloud-native architectures: microservices, APIs, distributed systems and containerised workloads
- Set technical direction and influence engineering decisions across teams
- Mentor through design reviews, code guidance and best practice
- Identify and deliver practical uses of AI/ML and Generative AI in production products
- Help shape the long-term technical roadmap and communicate trade-offs and risks
What you'll bring
- 10+ years in software engineering, with proven Principal-level (or equivalent senior IC) scope
- Strong, recent, hands-on C#/.NET Core experience
- Deep production AWS experience across services such as EC2, S3, ELB, Auto Scaling, RDS, Lambda, SQS and container services
- A track record of architecting and building large-scale distributed systems, microservices and highly available applications
- Experience modernising complex legacy systems into resilient, cloud-native solutions
- Strong grounding in architecture, OO design, algorithms, design patterns, API design and relational databases
- Excellent communication, able to influence across Product, Engineering, Security, QA, Data and Ops
- Degree in Computer Science or a related field, or equivalent experience