Salary: £40,000 - 70,000 per year Requirements: Strong experience in C# and modern backend development Solid understanding of TypeScript and React Proficiency with PostgreSQL or similar relational databases Experience integrating with quant libraries, pricing engines, or other computational services Ability to operate effectively in a front-office or similarly fast-paced environment Comfortable working with incomplete requirements and driving clarity through discussion Strong communication skills and willingness to engage directly with Trading and Quants Ability to deliver both quick tactical fixes and well-designed strategic solutions Experience in FX, options, or other derivatives Familiarity with risk systems, valuation concepts, or market data Experience with distributed systems or real-time data processing Prior exposure to global teams and cross-time-zone collaboration Responsibilities: Deliver high-quality features and enhancements across UI, services, and pricing components Work closely with the Team Lead, Traders, Quants, and other developers to clarify requirements Break down ambiguous or high-level Jira tickets into actionable technical tasks Design pragmatic solutions that balance speed, robustness, and long-term maintainability Participate in code reviews, knowledge sharing, and architectural discussions Support production systems, including participation in the on-call rota Contribute to an inclusive, collaborative team culture Technologies: Backend C# Fullstack Support JIRA Network PostgreSQL Quant React TypeScript UX UI Design Security More: We are hiring an FX Developer - React C# Fullstack for our London, UK team on a contract basis. We operate within the trading environment as part of TEKsystems, a company within the Allegis Group network. This role sits in a fast-paced front-office setting where we collaborate closely with Traders, Quants, and developers to deliver robust solutions across UI, services, and pricing components. We also participate in code reviews, architectural discussions, production support, and an inclusive team culture. last updated 24 week of 2026