Lead Risk Software Engineer LDN in City of Westminster

Senior Python Developer – Risk & Pn L (Rates LOB)

We are seeking an experienced Senior Python Developer to join our Athena Rates development team to work on our Risk and Pn L framework for the Rates line of business.

In this role you will architect, design, develop, and integrate sophisticated solutions that support trading desks and back‑office functions across rates products.

Responsibilities

• Build and maintain robust software solutions for rates trading activities.
• Collaborate closely with quantitative analysts, traders, and risk managers to integrate systems across front‑office, middle‑office, and back‑office processing.
• Develop scalable, high‑performance code that handles large volumes of market data and complex financial calculations, including risk metrics, Pn L attribution frameworks, and data pipelines that connect trading systems with downstream consumers.
• Participate in architectural decisions, code reviews, and technical design sessions, contributing expertise to shape the evolving automated platform.
• Translate business needs into technical solutions, explain technical constraints to both technical and non‑technical stakeholders, and gather requirements from business users across multiple teams.
• Prepare and maintain legacy applications when required.

Qualifications

• Minimum five years of hands‑on Python development experience.
• Strong preference for candidates with a financial services background.
• Solid understanding of software engineering principles, including object‑oriented design, testing methodologies, and version control practices.
• Demonstrated ability to write clean, maintainable code and work effectively within large, complex codebases.
• Strong verbal and written communication skills with an ability to articulate technical concepts to both technical and non‑technical stakeholders.
• Proficiency with relational and No SQL databases; experience with distributed systems and real‑time data processing.
• Knowledge of modern development practices including CI/CD pipelines and containerization.
• Experience with rates products such as swaps, securities, options, and repo; familiarity with risk methodologies and Pn L calculation frameworks.
• Exposure to quantitative finance concepts and market risk measures.
• Understanding of regulatory reporting requirements in financial services.
• Preferred Qualifications
• Prior experience with other financial risk stack platforms such as Sec DB, Quartz, or Athena.
• Experience using agentic AI tools for software development, testing, and analysis.
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