Software Engineer (London Area)

API Engineer – C#/Kubernetes – Trading Infrastructure (12-Month Contract, Inside IR35)(No Sponsorship Offered)

We’re hiring an experienced API engineer on a 12-month contract for a top-performing global hedge fund. If you live and breathe backend systems, know how to build battle-hardened APIs in C#, and can wield Kubernetes like a pro—this one’s for you.

You’ll be joining an elite engineering team at the core of the firm’s trading stack, delivering high-performance services that drive execution, data, and automation workflows across the business.

The Mission

This is a hands-on engineering role focused on designing, building, and deploying critical APIs that underpin a multi-strategy global trading platform. Think low-latency comms, resilient services, and cloud-native orchestration - all at scale! You’ll work shoulder-to-shoulder with quants, traders, and infra engineers to push the platform forward.

Expect to operate in a high-trust, high-impact environment where your code hits production fast and clean design matters.

What You’ll Be Doing

• Designing and developing RESTful APIs and internal services in modern C# (.NET Core/.NET 6+).
• Containerising and deploying workloads using Kubernetes across hybrid cloud/on-prem environments.
• Building performant, observable systems that can be monitored, scaled, and debugged under pressure.
• Collaborating with cross-functional teams to integrate services with trading systems, data pipelines, and control tooling.
• Automating builds, CI/CD workflows, and testing pipelines to maintain velocity and reliability.

What We’re Looking For

• Deep C#/.NET engineering experience - ideally with distributed systems, messaging, or low-latency APIs.
• Strong Kubernetes know-how (Helm, Operators, autoscaling, secrets, RBAC, etc.), preferably in production.
• Familiarity with containerization (Docker), service meshes, and microservices architecture.
• Background in financial services or trading tech is a big plus - but not a dealbreaker.
• Experience building robust, testable systems that run 24/7 in demanding environments.
• Clear communicator who can work independently, take ownership, and hit the ground running.
• Bachelor's/Master's Degree in Computer Science or Engineering from a top-tier/Russell Group university.

The Opportunity

• 12-month contract with high visibility and real impact.
• Up to £900/day , inside IR35 .
• Work alongside some of the best minds in systematic trading.
• Tight-knit, engineering-led culture with autonomy, pace, and purpose.