Python Developer

Python Developer – Trading Systems Location: London, UK (Hybrid) Salary: Up to £140,000 + Bonus + Excellent Benefits We're partnering with a leading global financial technology firm seeking a talented Python Developer to join its Middle Office Engineering team. This is a fantastic opportunity to work on high-performance trading infrastructure, building the systems that power trade reconciliation, back-testing frameworks and real-time trading monitoring. You'll collaborate closely with infrastructure, quantitative research and treasury teams, solving complex engineering challenges in a low-latency, data-intensive environment. What you'll be doing • Develop robust, production-quality Python applications for business-critical trading systems • Build tools and services that process large volumes of financial data • Improve software performance, scalability and throughput • Design and implement new features across trade reconciliation, monitoring and analytics platforms • Collaborate with infrastructure and quantitative research teams to deliver high-quality engineering solutions • Contribute to automated testing and continuous improvement of the development lifecycle. What we're looking for • Strong commercial Python development experience • Excellent knowledge of NumPy, Pandas and SQL • Experience writing automated tests for Python applications • Ability to design clean, maintainable and well-documented software • Comfortable working independently while collaborating within highly technical teams Desirable experience includes: • Test-driven development using pytest • Airflow or similar workflow orchestration tools • Polars • CI pipelines (Jenkins or similar) • WebSocket or TCP/IP networking • pybind/nanobind • Degree in Computer Science, Mathematics or a related STEM discipline. What's on offer • Base salary up to £120,000 • Annual bonus • Comprehensive benefits package • Work on high-performance, business-critical trading systems • Modern engineering culture with strong testing practices and collaborative development • Excellent opportunities for technical growth within a world-class engineering environment.