3x Front Office C# Developer (Quant, E-Trading and Commodities) Quant Day Rate: Up to £900 (Via Umbrella) E-Trading and Commodities Day Rate: Up to £750 (Via Umbrella) Working Arrangement: Hybrid (3 Days P/W Onsite Marylebone) Duration: 6 months (initial) A leading Global Markets business is expanding across three front-office technology teams and is seeking experienced C# Developers to join their Quant, E-Trading and Commodities groups. These roles sit close to the business, working directly with traders, quants and cross-functional partners to build high-performance systems that support pricing, execution, liquidity, balance sheet optimisation and the full trade life cycle See Below Roles: 1. Quant Engineer - Liquidity & Balance Sheet Optimisation This role sits within the Quantitative Research team, developing the analytics that compute and optimise liquidity and balance sheet metrics across all business lines. Key Responsibilities Design and enhance the internal C# analytics library for liquidity and balance sheet metrics. Build analytical tools for traders and business managers to monitor resource consumption. Participate in trading meetings and strategy discussions, providing insights and recommendations. Collaborate with Trading, Sales, IT, Market Risk and global Research teams. Core Skills Strong C# development skills with solid understanding of data structures and algorithms. Familiarity with liquidity, balance sheet or regulatory topics is advantageous. Strong communication skills and confidence engaging with front-office stakeholders. 2. E-Trading C# Developer - Electronic Trading (Pre-Trade) This role focuses on building and optimising low-latency, high-performance components that underpin electronic trading across multiple asset classes. Key Responsibilities Develop pricing, execution and workflow components for electronic trading. Work with high-volume, low-latency data, multithreading and concurrency. Deliver rapid enhancements in partnership with traders and quants. Contribute to microservices architecture and front-end components (React/Angular) Core Skills C#, SQL, multithreading, concurrency and high-performance system design. Experience with microservices architecture. Background in e-trading or pre-trade execution (any asset class). Understanding of trade orders and workflows. Nice to have: React or Angular (role is 70% backend / 30% frontend). 3. Commodities C# Developer - Commodities Derivatives Platform This role joins the London-based core development team supporting the full pre-trade to accounting chain for Commodities Derivatives. Key Responsibilities Design and develop core functionality for the Commodities Derivatives platform. Deliver enhancements across pricing, risk, regulatory and post-trade services. Ensure platform stability through robust testing and release control. Follow team standards for code review, deployment and architectural governance. Core Skills Strong C# and SQL Server experience. Experience with microservices, web technologies, Redis, Consul, Octopus or TeamCity is beneficial. Organised, delivery-focused and comfortable working autonomously. Reasonable Adjustments: Respect and equality are core values to us. We are proud of the diverse and inclusive community we have built, and we welcome applications from people of all backgrounds and perspectives. Our success is driven by our people, united by the spirit of partnership to deliver the best resourcing solutions for our clients. If you need any help or adjustments during the recruitment process for any reason, please let us know when you apply or talk to the recruiters directly so we can support you.