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Senior Quantitative Developer - Rates / Equities £675pd Inside IR35 12 month project 3 days on site emagine is a high-end professional services consultancy and solutions firm specialising in providing business and technology services to the financial services sector. We power progress, solve challenges, and deliver real results through tailored high-end consulting services and solutions. We have created a culture of openness and integrity by building genuine and strong relationships and partnerships, enabling us to be uncompromising in our dedication to delivering the optimal service for our clients. Our commitment is not just towards our clients — we aim to foster a positive and equitable working environment with our consultants and colleagues, which stems from our core values: Confident, Dedicated, Responsible, Genuine. We are seeking a highly skilled Senior Quant Developer to lead a major spreadsheet-retirement initiative, transforming legacy Excel-based analytics into robust, production-grade Python components. This is a hands-on technical leadership role, owning the full lifecycle of analysis, redesign, development, and integration into a modern analytics framework. Key Responsibilities Lead the decommissioning of ~10 complex, end-of-life spreadsheets with significant operational and modelling risk. Analyse, reverse-engineer, and simplify legacy Excel logic, formulas, macros, and hidden workflows. Rebuild analytics as clean, maintainable, and scalable Python solutions. Integrate new components into existing proprietary analytics libraries and data frameworks. Apply strong engineering standards, including automated testing, documentation, and reliability practices. Translate embedded SQL-style logic into well-structured, producti