Python Developer

Python Developer – Trading SystemsLocation: London, UK (Hybrid)Salary: Up to £120,000 + Bonus + Excellent BenefitsWe'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 teamsDesirable 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.