Senior C# / .NET Developer Risk and Securities Lending Duration: 6 Months Contract Location: London (Hybrid) Work mode: Hybrid If you''re a Senior .NET Engineer who thrives on understanding why a system is being built-not just how to code it-this one''s for you. A top-tier financial firm in London is looking for a rounded backend engineer to build high-throughput engines for live Risk calculations and Securities Lending workflows.We''re moving away from post-trade compliance and static reporting tools. Instead, you''ll be right in the thick of active risk mechanics: engineering real-time limit engines, dynamic exposure calculations, and live financing workflows. You''ll work closely with Quants, Risk Managers, and Front Office teams, turning quantitative models into production-ready software.Mandatory Criteria Direct Financial Services Background: Experience in Investment Banking, Hedge Funds, Asset Management, or Capital Markets FinTech. (Generic enterprise/web software backgrounds won''t fit here.) Core Functional Exposure: Hands-on domain depth in Credit, Market, or Counterparty Risk, Securities Lending, Prime Brokerage, or Collateral/Margin platforms. Calculation and Framework Mechanics: Working knowledge of RWA, Basel III/IV, CCAR, counterparty limit monitoring, or live exposure calculations. Core Tech Stack: Expert-level C# / .NET (.NET Core), scalable API design, and solid OOP/architectural principles. Data and High Performance: Strong SQL skills, experience handling ..... full job details .....