Senior Software Engineer

Senior Software Engineer (C#/.NET)

Ready to make your application Please do read through the description at least once before clicking on Apply.

Remote-first (UK) | Up to £100k + benefits | Permanent

We're supporting a fast-growing fintech fx platform that builds institutional-grade trading and risk-management systems used by global corporates and investment managers. Their engineering teams are scaling out the core trading backbone, a .NET-based microservices environment powering billions in transaction volume.

You'll join a small, high-impact engineering group responsible for modernising and extending their event-driven trading architecture - working across 40+ services, solving complex asynchronous communication challenges, and driving clean software design.

What you'll do

• Design and build distributed microservices in C#/.NET Core
• Contribute to architecture and design decisions around messaging, scaling, and reliability
• Develop across the stack (backend-leaning; React used on newer UIs)
• Maintain and modernise legacy .NET codebases into cloud-native solutions
• Apply DDD, async patterns, and testing best practices
• Collaborate with platform, QA, and AWS-based teams on cross-system integrations

Tech snapshot

C# / .NET Core | SQL Server | RabbitMQ / Azure Service Bus | React | Azure + AWS | DDD | Microservices | Async / Multithreading

What they're looking for

• 5+ years in C#/.NET software engineering
• Experience with asynchronous, event-driven microservice architectures
• Confident with queues, concurrency, and threading concepts
• SQL Server expertise
• Cloud exposure (Azure or AWS)
• Understanding of modern engineering principles (testing, CI/CD, design patterns)
• Finance or trading experience is a plus

Why join

• Work on critical, high-volume trading systems where design truly matters
• Remote-first flexibility with optional London office access
• Supportive, collaborative team that values learning and pragmatic engineering
• Competitive package, healthcare, wellness budget, EV scheme, and 30-day holiday progression

Interested?

Apply now or reach out for a confidential chat about how this role could fit your experience.