Software Engineer | C#, SQL, Legacy Refactoring | Systematic Hedge Fund
Rate: £650-750 per day
IR35: Outside
Duration: 12 months
Location: 3 days in the office per week in Moorgate/Liverpool Street
We’re working with a high-performing, systematic hedge fund based in the City to help them hire a Senior Software Engineer to take ownership of a core Portfolio Management platform during a major platform migration and refactor initiative.
This is a unique opportunity to own and evolve a mission-critical application in a lean, engineering-led environment where quality matters and your input will directly shape the platform’s future.
Environnent & Culture:
- 3 days a week in-office (typically Mon/Wed/Fri) - ESSENTIAL
- Based in a central London WeWork office with access to a nearby front-office floor
- Very lean team, just 16 people globally, 8 of whom are in technology
- Fast decision-making, lots of autonomy, and very high standards
- Expect collaborative discussion and plenty of technical back-and-forth
Tech Stack:
- C# / .NET (currently on 4.6.1, migration planned)
- SQL Server (Any RDBMS experience is ok)
- Python (nice to have)
- Docker (nice to have some containerisation appreciation)
- CI/CD, monitoring, observability (nice to have)
- Experience in XP or lean development (nice to have)
The Role:
- You’ll be the lead engineer on their Portfolio Management application, refactoring the existing codebase, helping move it to a new server environment, and improving how logic sits between the app and the database.
- The application is mature but under-tested, so the focus is on precision refactoring, incremental improvement, and maintaining behavioural integrity during change.
- You'll work closely with senior platform owners, quant developers, a DevOps engineer, and trading analysts across the front and middle office.
About You:
- 10 years’ experience as a hands-on software engineer
- Strong C#/.NET and SQL background, ideally in data-centric or financial systems
- Solid experience refactoring legacy applications without full test coverage
- Testing: You must be a meticulous Tester in TDD. Excellent at writing characterisation tests to lock down behaviour before improving
- You must have a passion for refactoring to improve code quality and for automated testing at all levels: unit, integration & acceptance.
- You take pride in annotated, clean commits and structured workflows
- Having a ‘DevOps mindset’ and getting the importance of culture
If you enjoy carefully improving legacy code, owning your application, and collaborating closely with a brilliant (and refreshingly small) trading and quant team, this one’s for you.
Apply ASAP for an immediate interview!
Software Engineer | C#, SQL, Legacy Refactoring | Systematic Hedge Fund
