Senior Python Developer - Trading & Risk Platforms - Up to £700 per day Inside IR35

Hybrid in Central London Inside IR35 - Up to £700 per day We are seeking Senior Python Developers with proven experience building trading and risk systems within investment banking. You will develop backend services, data processing solutions and risk-focused applications supporting trade lifecycle, risk calculations and reporting. Key Responsibilities • Develop and enhance Python applications for trading and risk platforms • Build data pipelines and automation for trade, risk and reconciliation workflows • Process large financial datasets supporting PnL, risk and regulatory reporting • Contribute to architecture, scalability and system design decisions • Partner with quants, traders and risk teams to deliver technical solutions • Develop and integrate REST APIs and backend services • Maintain high code quality through testing, reviews and best practices • Mentor junior developers where required Required Skills • Strong Core Python development experience • Experience with enterprise trading and risk platforms (e.g. Quartz, SecDB, Athena, Kanon, Beacon or similar) • Strong SQL and large-scale data handling expertise • Pandas and NumPy for data processing and analytics • REST API development using Flask, FastAPI or Django • Strong understanding of performance optimisation and scalable systems • Unix/Linux and shell scripting experience Domain Experience • Investment Banking or Capital Markets background • Experience across Market Risk, CCR, PnL, Trade Lifecycle and Reconciliations • Knowledge of derivatives, swaps, futures, options and fixed-income products Desirable • PySpark or distributed data processing • Exposure to quantitative models and pricing systems • Global banking environment experience • 9–15 years' relevant experience Please note: Candidates without trading, risk or capital markets experience will not be considered.