Senior C# Developer - Investment Banking (6 Month Contract) Location: London (Hybrid) Contract: 6 months (initial) Day Rate: Competitive (Via Umbrella) Overview We are seeking an experienced Senior C# Developer to join a high-performing PnL Explain development team within a leading investment bank. The role focuses on building and enhancing a large-scale Risk & PnL data warehouse platform alongside a front-office web-based reporting and sign-off application. This is an excellent opportunity to work on business-critical systems within a fast-paced front-office environment. Key Responsibilities Participate across the full Agile Scrum lifecycle, including: Collaborating with stakeholders to define and refine user stories Developing high-quality, well-structured code with appropriate unit testing Contributing to code reviews and ensuring quality prior to production release Providing 3rd line support for production systems Take ownership of key deliverables and projects across multiple applications Design, build, and maintain robust and scalable solutions within a data-heavy environment Contribute to the development and continuous improvement of DevOps pipelines, including CI/CD and artefact management Drive improvements in engineering processes, introducing modern best practices for coding, testing, and release management Refactor and optimise existing codebases to enhance performance, scalability, and maintainability Mentor and support junior developers, promoting best practices and technical excellence across the team Key Skills & Experience Extensive experience in software engineering, with a proven track record delivering complex, enterprise-scale systems Expert-level knowledge of C# / .NET Framework, including multi-threading and design patterns Strong experience with SQL Server and T-SQL development Exposure to ClickHouse or similar high-performance database technologies Experience with front-end technologies such as Angular, or desktop UI development using WinForms Solid understanding of Agile methodologies and DevOps practices Strong communication skills, with the ability to collaborate effectively with both technical and non-technical stakeholders Excellent analytical and problem-solving abilities Desirable Experience working within Investment Banking / Front Office environments Knowledge of Risk, PnL, or reporting systems Exposure to large-scale data platforms or data warehousing solutions Why Apply? Opportunity to work on front-office, business-critical systems Exposure to large-scale data engineering and reporting platforms Collaborative, high-performing engineering culture Strong likelihood of contract extension Guidant, Carbon60, Lorien & SRG - The Impellam Group Portfolio are acting as an Employment Business in relation to this vacancy.