Quantitative Developer in City of London

Quantitative Developer – C# / Python

London | Full-time

The mission

Join a leading quantitative research and trading firm using heavy compute and modern engineering to tackle some of the hardest problems in systematic finance. You’ll sit close to the money, turning cutting‑edge research into production systems that run at scale in global markets.

The role

This is a hands‑on engineering role working side‑by‑side with quants. You’ll design, build and optimise trading, simulation and research systems in C# and Python, with huge emphasis on performance, reliability and clean architecture.

What you’ll do

• Build and evolve trading systems that run 24/6 with real capital at stake.
• Develop modelling and simulation frameworks that quants use to test and refine strategies.
• Improve research tooling and workflows so ideas move smoothly from prototype to production.
• Push performance and scalability in core services, unlocking new research and trading capabilities.
• Take end‑to‑end ownership of projects, from design through to deployment and iteration.

What you bring

• Strong software engineering fundamentals: algorithms, data structures, architecture.
• Commercial experience in C# and/or Python, ideally on complex, high‑performance systems.
• Interest in quantitative finance and how engineering accelerates research and trading.
• Comfort working closely with stakeholders, prioritising impact and communicating clearly.

Why you might care

• Work at the intersection of advanced research, serious engineering and real‑world markets.
• Industry‑leading compensation, deep technical culture, serious investment in tools, learning and long‑term career growth.