Senior Software Engineer (C#/.NET)
đź“Ť Remote-first (UK) | đź’° Up to ÂŁ100k + benefits | đź•“ 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.