Junior C# Developer Hedge Fund Job London area,England UK,Software Development

My client, a high-performing, data-driven hedge fund, is seeking a top-tier Graduate / Junior C# Developer to join their London-based technology team.

This is a rare opportunity to join a lean, high-calibre environment where technology sits at the core of the business. The team is directly aligned to the trading function, building systems that process market data, support analytics, and enable trading decisions across fixed income markets.

You will be working in a flat, agile team with real ownership from day one, contributing to a wide range of projects and actively participating in architectural discussions. The environment is fast-paced, with an iterative development cycle and weekly production releases, requiring engineers who are both pragmatic and delivery-focused.

Key Responsibilities will include:

Building and enhancing high-performance systems in C# supporting trading and analytics workflows
Developing tools for market data processing, trading infrastructure, and internal platforms
Working across the full development lifecycle: design, implementation, testing, and production support
Collaborating closely with traders, quants, and engineers to deliver robust, scalable solutions
Contributing to system architecture and design decisions from an early stage

The team regularly tackles complex engineering challenges, including:

State management and fault tolerance at scale
Concurrency and race conditions
Distributed compute and parallelisation
Horizontal scaling and sharding
Large-scale data processing

A successful candidate will:

Have an outstanding academic background (Computer Science, Maths, Physics or similar)
Demonstrate strong experience with C# / .NET
Possess a solid foundation in data structures, algorithms, and system design
Show evidence of technical curiosity and extracurricular projects
Be motivated to work in a high-performance, collaborative environment
Exposure to financial markets (bonds, swaps, rates, FX)
Experience with Python for data or quantitative work
Familiarity with Linux environments

You can expect:

A high-impact role working directly with the trading function
A flat structure with real ownership and responsibility
Exposure to complex, non-trivial engineering problems at scale
A fast-paced environment focused on continuous learning and improvement
Highly competitive compensation and bonus structure