Senior Full Stack Developer

Salary: £95,000 - 95,000 per year Requirements: • Deep practical experience designing, building and supporting production software using C# and .NET. • Strong full-stack capability across React, TypeScript, SQL Server and HTTP APIs. • Strong knowledge of object-oriented design, relational data modelling, and automated unit, integration and front-end testing. • Experience delivering complex changes using Git-based source control, code review, Azure DevOps and CI/CD pipelines. • Ability to design services, APIs and integrations, and reason about distributed, event-driven and real-time behaviour. • Strong capability in observability, diagnostics, incident investigation and failure-mode analysis. • Demonstrated ability to resolve ambiguity, make significant technical decisions and lead complex work without formal authority. • Understanding of security, performance, resilience, operability, data integrity and long-term maintainability. • Ability to mentor engineers and coordinate contributors across complex delivery. • Ability to explain commercial, operational and technical trade-offs to Product, QA, Support and engineering stakeholders. • Desirable: Experience delivering or operating trading platforms, financial-services systems or other regulated, business-critical software. • Desirable: Substantial experience with real-time, high-availability, low-latency or event-driven systems. • Desirable: Strong practical experience with RabbitMQ, SignalR, Azure services or Entity Framework. • Desirable: Experience with complex front-end workflows, market or reference data, observability and production incident leadership. Responsibilities: • Lead technically complex features, projects and services, turning ambiguous business problems into reliable technical outcomes across our real-time, business-critical trading platforms. • Provide independent technical leadership within the relevant domain, resolve ambiguity, make significant design decisions and coordinate contributors, escalating decisions with material product-wide, regulatory, security or architectural consequences. • Deliver owned work from clarification and design through implementation, testing, release and production operation. • Design and implement maintainable changes across C#/.NET services, React and TypeScript interfaces, HTTP APIs, integrations and SQL Server databases. • Apply proportionate engineering design and document material decisions, assumptions and trade-offs. • Write and maintain appropriate unit, integration, API and front-end automated tests. • Use Git, Azure DevOps, build pipelines and CI/CD processes safely and consistently. • Diagnose application, integration and data issues using logs, monitoring, debugging and data analysis. • Improve monitoring, alerting, runbooks, documentation and operational readiness. • Work with Product and Business Analysis to clarify outcomes, priorities and acceptance criteria; work with QA to define suitable coverage and Support to investigate production issues. • Participate in design discussions, provide clear and constructive code-review feedback, and communicate progress, dependencies, risks and blockers early. • Identify technical debt, reliability risks and proportionate improvements to tools and practices. • Use approved AI-assisted engineering tools responsibly and remain accountable for the results. • Mentor and guide engineers contributing to complex work, and lead complex changes from discovery and technical analysis through production operation. Technologies: • AI • API • Azure • C# • CI/CD • DevOps • Git • HTTP • Support • RabbitMQ • React • SQL • Security • SignalR • TypeScript • ASP.NET • Cloud • Fullstack More: We are a thriving Financial Services business offering the opportunity to solve difficult technical challenges across distributed, event-driven and real-time derivatives and structured-products trading systems. In this Senior Full Stack Developer role, you will work hands-on with C#/.NET, React, TypeScript, SQL Server, APIs and integrations, with a focus on security, resilience, performance, operability and long-term maintainability. You will act as a trusted technical adviser to Product and QA and work with Support on significant operational issues. Our trading systems primarily use C# and .NET, TypeScript and React, SQL Server and Entity Framework, HTTP APIs and integrations, RabbitMQ, SignalR, Azure DevOps and Azure services. last updated 41 week of 2026