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 LondonRequirements 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 stakeholdersBenefits package includes:Bonus up to 25%Private medical insuranceLife insurancePension scheme25 days holidayStructured career developmentWellness benefits including gym membershipx3 days in the office per weekIf 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.