Referment
Senior Software Engineer (B0F9795)
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Referment is working with a regulated payments business to hire a Senior Software Engineer focused on modernising established systems. The challenge is to make complex C# and SQL logic easier to understand and maintain while keeping revenue-critical services running safely.
You will work across legacy and modern.NET, extracting business rules into tested components and improving the services around them. This is a role for someone who enjoys understanding why an existing system behaves as it does before changing it, rather than starting with a wholesale rewrite.
The Role
- Trace business rules through C#, JavaScript and SQL stored procedures, then separate them into components that can be tested independently.
- Build services with clear dependency management, access controls and logging so their behaviour can be understood in production.
- Investigate problems across APIs, data processing and messaging, including failures caused by the way systems interact.
- Compare new calculations with existing outcomes in shadow mode before allowing changes to affect live processing.
- Refactor SQL Server logic carefully, preserving the correctness of client-money handling.
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What We're Looking For
- Senior hands-on experience with .NET 6+ and .NET Framework 4.8, including MVC5, WebAPI 2 and Entity Framework 6.
- Deep SQL Server experience and confidence reading and safely changing complex stored procedures.
- Working JavaScript or TypeScript knowledge and the ability to follow behaviour across application and database code.
- A measured approach to modernisation, using tests and comparison of outputs to demonstrate that changes are safe.
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Useful Additional Experience
- Experience with AWS Lambda, SQS, SNS or RDS would help. This could suit a senior.NET engineer who finds satisfaction in untangling established systems and improving them incrementally, with correctness taking priority over a particular architectural fashion.
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