Python Quant Developer (Contract) Excel to Enterprise Python Transformation | Hedge Fund | Inside IR35 | 3 Days Onsite A technology-driven hedge fund is seeking an experienced Python Quant Developer to join a major front-office transformation programme focused on rebuilding its quantitative modelling infrastructure. This is an initial 6-month contract (inside IR35) forming part of a 24-month strategic programme, with extensions highly likely. The role requires 3 days per week onsite. Role Overview You will lead the conversion of complex, legacy Excel/VBA-based financial models into a modern, enterprise-grade Python framework. The existing models span Rates and Equities (linear and derivatives) and are heavily embedded in front-office workflows. Many spreadsheets are complex and organically developed, requiring strong analytical ability to interpret, rationalise, and modernise. This is not a simple translation exercise — you will be expected to architect robust, scalable Python libraries that improve workflow efficiency, maintainability, and model governance. The fund operates in a cloud-based environment (Azure currently, though broader cloud experience is welcome) and the team is actively leveraging AI tools within development and research workflows. Candidates comfortable working alongside AI-assisted development processes will be highly valued. Key Responsibilities Analyse and interpret complex, legacy Excel/VBA financial models Convert spreadsheet logic into clean, maintainable, enterprise-grade Python code Architect and design a scalable Python analytics library to replace legacy systems Work closely with Rates and Equities teams to validate, enhance, and sign off models Face off directly with quants and traders to gather requirements and explain outputs Improve model workflows and proactively identify process enhancements Operate within a cloud-based infrastructure (Azure environment) Maintain high coding standards, documentation, and testing practices Report progress and business impact clearly to stakeholders Required Experience & Skills Strong Python development experience within a quantitative or front-office environment Proven experience rebuilding or industrialising financial models Solid understanding of: Rates products Equities Linear instruments Derivatives pricing concepts Excel VBA experience with the ability to interpret complex legacy spreadsheets Experience working directly with quants and/or traders Ability to architect frameworks — not just translate Excel into Python Familiarity with cloud environments (Azure preferred; AWS/GCP acceptable) Excellent communication skills and stakeholder management capability Nice to Have Experience on large-scale Excel-to-Python migration programmes Exposure to AI-assisted development workflows Experience building client-facing or enterprise analytics libraries Background in financial mathematics or quantitative modelling Contract Details Inside IR35 6-month initial contract 24-month transformation programme (extension highly likely) 3 days per week onsite