Full Stack Software Engineer

Full Stack Software Engineer — Node.js - React.js - JavaScript - London. A leading equities brokerage is rebuilding its core trading platform end-to-end — front and back — and needs an engineer who understands that a system handling billions of dollars in daily flow is not a standard web application. This is a hands-on role embedded in a high-calibre engineering team whose work is used by front-office traders across London, Chicago, and Hong Kong in real time. You will work across the full stack — building the React interfaces traders rely on and the Node.js services that power them — solving performance, data throughput, and UX challenges that most engineers never encounter, working directly with the trading desk. What the Full Stack Software Engineer will be doing: Design and build high-performance React UIs for real-time equities data — low latency, high data throughput, browser-rendering optimisationDesign and build the Node.js services and APIs that feed those interfaces, handling high-volume, real-time market dataDevelop and maintain JavaScript libraries and services tailored for demanding financial data display and processingCollaborate closely with front-office stakeholders and other engineers to translate trading workflows into robust, intuitive, end-to-end solutionsOwn the quality and architecture of both frontend and backend codebases — with genuine influence over technical directionWork within a distributed team across three global offices, with day-to-day presence in London Requirements for the Full Stack Software Engineer: 4+ years of commercial full stack engineering experience, with a strong JavaScript foundation across the stack.React expertise — you write clean, performant component architecture and know when not to use the framework.Solid, hands-on Node.js experience — building and running real backend services, not just tooling or scripting.Proven ability building robust, high-volume applications (frontend and backend) under real-world performance constraints.Exposure to financial services, trading systems, or similarly demanding real-time data environments is a genuine advantage — not a requirement, but it will set you apart.Strong communicator comfortable working across engineering, product, and trading desk stakeholders Benefits package includes: Bonus up to 25% Private medical insurance Life insurance Pension scheme 25 days holiday Structured career development Wellness benefits including gym membership x3 days in the office per week If you have full stack engineering experience in a high-performance or data-intensive environment and want to work on software that genuinely matters to the people using it, we'd like to hear from you.