Senior Systems Engineer

You will build and operate mission-critical systems responsible for correctness, performance and reliability of high-volume banking transactions.

What you will be doing:

• Build transaction processing services with strong correctness guarantees
• Optimize p95/p99 latency and throughput of critical system hot paths
• Debug complex system-level and distributed failures
• Design and enforce invariants through testing and operational discipline
• Own observability, on-call readiness and incident response
• Use AI-assisted tools to improve debugging and operational efficiency

Do you have experience in Rust (programming language)?, * Strong system-level engineering experience in Go and/or Rust

• Deep understanding of distributed systems failure modes
• Performance and concurrency expertise
• Experience operating production systems at scale
• Security- and reliability-focused mindset

Added bonus if you have:

• Low-level performance profiling experience
• Financial transaction processing experience
• Experience designing safe APIs and primitives
• AI-driven debugging and observability tooling

What we offer you:

• A work environment built on collaboration, flexibility and respect
• Competitive salary and attractive range of benefits designed to help support your lifestyle and wellbeing
• Varied and challenging work to help you grow your technical skillset

At FIS, you'll work on some of the most complex and impactful challenges in modern banking, helping build next-generation, AI-enabled platforms used by financial institutions worldwide. We foster an environment that values ownership, autonomy, and end-to-end responsibility, where engineers are encouraged to take initiative, make meaningful technical decisions, and ship solutions directly into production. We believe in open, collaborative, and ownership-driven teams with a strong focus on real-world impact.