Senior Python Developer - Trading & Risk Systems

CRISIL Limited; City of Westminster; On-site; GBP 75,000 - 110,000; Full time

Job summary

CRISIL Limited in London, United Kingdom is seeking an experienced Sr Python Developer for trading and risk platforms. The role focuses on backend Python development, data processing, and risk calculations to support trade workflows and reporting.

You will build data pipelines, work with large financial datasets, and contribute to system design and scalability while collaborating with quants, traders and risk teams.

Qualifications

• 6-10 years of Core Python development experience.
• Strong SQL skills with large datasets.
• Experience with Pandas/NumPy for data processing.
• REST APIs and backend services (Flask / FastAPI / Django).
• Knowledge of data structures and performance optimization.
• Experience with large-scale data processing and optimization.
• Unix/Linux environments and shell scripting.
• Domain experience in Investment Banking / Capital Markets.
• Hands-on exposure to Market Risk / CCR / PnL / Trade lifecycle / Reconciliation.
• Understanding of derivatives (swaps, futures, options) and bonds.

Responsibilities

• Develop and enhance Python-based applications for trading and risk use cases.
• Build data processing pipelines and automation scripts for trade, risk and reconciliation workflows.
• Work with large financial datasets to support PnL, risk and reporting requirements.
• Contribute to system design, architecture and scalability decisions.
• Collaborate with quants, traders and risk teams to translate business requirements into technical solutions.
• Develop and integrate REST APIs and backend services.
• Contribute to CI/CD pipelines and deployment processes.
• Support production systems (L2/L3) including debugging and performance optimization.
• Write and maintain unit and integration tests; ensure high code quality.
• Participate in code reviews and mentor junior developers.

Tools

Flask

FastAPI

Django

Job description

CRISIL Limited in London, United Kingdom is seeking an experienced Sr Python Developer for trading and risk platforms. The role focuses on backend Python development, data processing, and risk calculations to support trade workflows and reporting.

You will build data pipelines, work with large financial datasets, and contribute to system design and scalability while collaborating with quants, traders and risk teams.