Sr Principal, Software Engineer

Position Type :

Full time

Type Of Hire :

Experienced (relevant combo of work and education)

ROLE SUMMARY

Sits within a newly acquired startup building an AI-enabled, autonomous banking platform for Tier-1 financial institutions within the banking group. The Systems Engineer builds mission-critical services that record and move value with strong correctness guarantees — owning transaction processing, performance, and reliability layers that banks depend on for hundreds of millions of transactions daily. Deep Go and/or Rust expertise required, with full end-to-end ownership from code to production....

KEY RESPONSIBILITIES

Systems Engineering

– Core Financial Systems: Build mission-critical services that record and move value with strong correctness guarantees.

– Transaction Processing: Implement safe, reliable transaction flows that behave predictably under retries and partial failures.

– Performance: Profile and optimise hot paths to keep p95/p99 latency predictable and throughput scalable.

– Reliability & Observability: Improve metrics, tracing, logging, alerting, and incident readiness for production systems.

– AI-Native Dev Experience: Use and improve AI-assisted workflows for debugging, operations, and developer productivity

Build & Operations

– Build and operate production systems end to end: design ® ship ® run.

– Enforce invariants and safety via testing, reviews, and disciplined change management.

– Debug distributed and system-level issues: concurrency, performance, data consistency.

– Drive operational excellence: SLOs, on-call, postmortems, automation.

– Collaborate cross-functionally to turn requirements into simple, safe primitives and APIs.

REQUIRED EXPERIENCE & CAPABILITIES

Technical Expertise

– Strong systems engineering experience in Go and/or Rust.

– Distributed systems fundamentals: consistency, fault tolerance, failure modes.

– Performance and concurrency expertise: profiling, tail latency, debugging

Cloud & Reliability

– Operational maturity: observability, incident response, and production ownership

Operating Style

– Security-minded and quality-focused with strong auditability and traceability instincts.

– Ownership mindset with the ability to make architectural decisions under uncertainty.

– AI-native engineer: integrates LLMs and agentic workflows into daily engineering practice.

IMPACT & SCOPE

– Direct impact on core banking platforms used by Tier-1 global institutions

– High autonomy and accountability within a small, senior team

– Work shipped directly to production environments at enterprise scale

WHY THIS ROLE

This role offers the autonomy, ownership, and technical depth of a startup, combined with the scale, stability, and long-term impact of

FIS. Engineers in this role shape foundational banking infrastructure while operating with clear accountability, enterprise resources,

and real-world production responsibility.

Privacy Statement

FIS is committed to protecting the privacy and security of all personal information that we process in order to provide services to our clients. For specific information on how FIS protects personal information online, please see the Online Privacy Notice.

Sourcing Model

Recruitment at FIS works primarily on a direct sourcing model; a relatively small portion of our hiring is through recruitment agencies. FIS does not accept resumes from recruitment agencies which are not on the preferred supplier list and is not responsible for any related fees for resumes submitted to job postings, our employees, or any other part of our company.

#pridepass