> Markdown version of [/jobs/ext/1376391-senior-c-net-developer-risk-securities-lending](https://www.wearedevelopers.com/jobs/ext/1376391-senior-c-net-developer-risk-securities-lending). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # senior c# / .net developer | risk & securities lending. - **Company:** Randstad UK - **Location:** London, UK - **Experience:** Expert - **Salary:** £130,000.0 - £143,000.0 - **Contract:** Temporary contract - **Skills:** .NET Framework, Application Programming Interfaces (APIs), Algorithmic Trading, Amazon Web Services, Application Performance Management, Microsoft Azure, Big Data, C Sharp (Programming Language), Cloud Computing, Code Review, JSON, Enterprise Messaging Systems, Microsoft SQL Server, Object-Oriented Software Development, Commercial Software, Systems Development Life Cycle, SQL Databases, .NET Core, Calculation of Risk Weighted Assets, Integration Tests, Apache Kafka, Restful APIs - **Published:** July 22, 2026 - **Apply:** https://www.randstad.co.uk/jobs/senior-c-net-developer-risk-securities-lending_london_47186687/ ## About the Role * Deep, hands-on experience with C# and .NET (including .NET Core). * Exceptional Object-Oriented Programming (OOP) skills and architectural design principles. * Proven track record in designing and implementing REST/JSON APIs. * Solid SQL database experience (e.g., SQL Server). * Strong grasp of application performance, scalability, unit/integration testing, and CI/CD pipelines. Essential Domain Knowledge: * A proven background working within Financial Services technology. * Strong domain knowledge in at least one of the following: Risk Management, Securities Lending, Prime Brokerage, or Collateral/Margin/Financing platforms. Highly Beneficial / Nice-to-Have: * Exposure to risk and regulatory methodologies (RWA, CCAR, Basel III / IV). * Understanding of credit risk, counterparty exposure, or capital calculations. * 10+ years of commercial software engineering experience. * Experience with Cloud platforms (Azure/AWS) and messaging technologies (e.g., Kafka). * Familiarity with front-to-back trading systems and Agile/Scrum delivery., * You possess a strong analytical and problem-solving mindset. * You are highly comfortable navigating complex, highly regulated enterprise environments. * You can communicate complex technical concepts clearly to non-technical stakeholders. * You are proactive, detail-oriented, and hyper-focused on reliable delivery. ## Description Are you a seasoned C# engineer with a deep understanding of financial markets? We are seeking an experienced Senior C# / .NET Developer to join a high-performing technology team supporting critical Risk Management and Securities Lending platforms. In this 6-month hybrid contract, you will play a pivotal role in designing, building, and supporting high-performance systems used for complex risk calculations and trading/financing workflows. Working closely with quants, risk managers, and the Front Office, you will deliver scalable, robust solutions in a fast-paced, regulated environment., * System Development: Design, build, and maintain high-performance C# / .NET applications supporting Risk and Securities Lending workflows. * API Integration: Build and consume RESTful APIs to seamlessly connect complex upstream and downstream financial systems. * Data & Throughput: Handle large datasets and high-throughput systems, contributing to vital exposure calculations, limits, and reporting. * Best Practices: Write scalable, testable, and maintainable object-oriented code, participating in architectural discussions and code reviews. * Cross-Functional Collaboration: Partner with Risk, Front Office, Operations, Compliance, and Product Owners to translate business needs into technical reality. * Production Support: Assist with incident analysis, remediation, and the ongoing support of live systems. ## Related Videos - [Tips and Tricks for Working with JSON](https://www.wearedevelopers.com/videos/1229-tips-and-tricks-for-working-with-json) - [Alibaba Big Data and Machine Learning Technology](https://www.wearedevelopers.com/videos/37-alibaba-big-data-and-machine-learning-technology) - [Functions Triggers using Azure Event Grids in Azure Blob Storage](https://www.wearedevelopers.com/videos/47-functions-triggers-using-azure-event-grids-in-azure-blob-storage) - [Microservices architecture as a key element in building trading systems for global finance markets](https://www.wearedevelopers.com/videos/1196-microservices-architecture-as-a-key-element-in-building-trading-systems-for-global-finance-markets) - [Building resilient .NET applications for the modern age](https://www.wearedevelopers.com/videos/1551-building-resilient-net-applications-for-the-modern-age) - [Introducing JSON Structure](https://www.wearedevelopers.com/videos/100219-introducing-json-structure) ## Related Articles - [Software Engineer Salary London](https://www.wearedevelopers.com/magazine/252-software-engineer-salary-london) - [Why Upskilling And Reskilling is Important For Developers](https://www.wearedevelopers.com/magazine/428-why-upskilling-and-reskilling-is-important-for-developers) - [Data Analyst Salary in the UK](https://www.wearedevelopers.com/magazine/278-data-analyst-salary-in-the-uk) - [Is Software Engineering Over-Saturated?](https://www.wearedevelopers.com/magazine/418-is-software-engineering-over-saturated) - [Best Companies to work for in London: Top 25 Companies in 2023](https://www.wearedevelopers.com/magazine/187-best-companies-to-work-for-in-london-top-25-companies-in-2023) - [Data Engineer Salary UK](https://www.wearedevelopers.com/magazine/253-data-engineer-salary-uk)