4 days ago
London, United KingdomSenior
Responsibilities
- Own Ledger Store through design, implementation, testing, deployment, and production operation.
- Build and scale a replicated double-entry ledger that provides exactly-once transfers and consistent state across replicas.
- Balance correctness, latency, throughput, and operational complexity in technical designs.
- Establish observability and alerting, participate in on-call and incident response, and address root causes.
- Deliver traceable, tested changes supported by measured results.
- Use AI-assisted development, MCP servers, and agent workflows where they improve engineering or operational outcomes.
- Mentor colleagues and write design notes, reviews, and operational documentation.
Requirements
- Production experience building and operating a distributed or durable system.
- Ability to reason about concurrency, consistency, idempotency, and failure modes.
- Understanding of how memory management, allocation, copying, and concurrency affect runtime performance.
- Strong programming depth and ability to learn the tools required by the problem; Rust experience is welcome.
- Experience debugging critical systems and participating in on-call or incident response.
- Ability to evaluate alternatives, explain trade-offs, and communicate complex systems clearly.
- Thoughtful use of AI with responsibility for the quality and safety of the resulting work.
- Valuable experience includes financial ledgers, payments, core banking, low-latency or high-throughput systems, deterministic simulation, fuzzing, property-based testing, multi-cloud, hybrid or on-premises deployments, capacity planning, deployment safety, disaster recovery, and security or compliance in regulated environments.
About FIS
FIS builds financial technology for banks, merchants, and capital-markets firms, including core banking platforms, payment processing, fraud/risk tools, and investment/treasury systems. It sells enterprise software, cloud services, and outsourced processing via long-term contracts and transaction-based fees. Founded in 1968 and headquartered in Jacksonville, Florida, FIS is a Fortune 500 public company trading on the NYSE (FIS) with customers worldwide.