Senior Frontend Engineer Remote (UK-based) | Full-Time
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Reactive Markets is the 2026 OTC Trading Platform of the Year ( ). Our network handles over $50 billion in daily trading volumes across FX, Equities, and Cryptocurrency, connecting 40+ of the world’s leading liquidity providers.We build trading systems that operate at the edge of what’s technically possible — where nanoseconds matter and a dropped message costs real money. Our engineering team is small, senior, and deeply invested in the craft of building cutting edge, reliable, high-performance systems.
We’re looking for a senior full-stack engineer to build the trading platform our clients use every day. Despite the “frontend” name, this is not a UI-only role — our Frontend team works across the whole application stack in TypeScript and Rust, from the trader-facing interfaces down to the services behind them. It’s distinct from our Backend team, who own the low-latency C++/Go trading engine.You’ll own complex, ambiguous, performance-critical work end-to-end — designed, built, tested, deployed, and supported in production. Occasional hours outside the normal working day are required for production releases, scheduled maintenance windows, and Level 3 support during critical incidents. Complex full-stack features in TypeScript and Rust — from trader-facing interfaces to the application services behind themReal-time market-data presentation and high-throughput, low-latency application code across FX, Equities, and CryptocurrencyReact and reactive state management (RX, MobX, or similar) for demanding, data-dense trading interfacesDistributed systems and real-time data over REST, WebSockets, and network protocolsObservability and monitoring — dashboards, alerting, and metrics that make frontend behaviour visibleStrong full-stack engineering ability with deep TypeScript / JavaScript (ES6+) (5+ years)Solid experience with React and reactive state management (RX, MobX, or similar)If your Rust is still developing, a strong track record of picking up new languages to depth quickly is essentialStrong grasp of distributed systems, API design, and real-time data (REST, WebSockets, network protocols such as TCP/UDP and binary protocols)Python for scripting, automation, and tooling is a bonusGit and Linux fundamentalsExperience in financial services or trading technology is a plus but not essentialYou ship. Senior here means trusted, not just experiencedClear, proactive communication — especially when things go wrong — is essentialYou embrace AI tooling. We use AI tools (Claude, Gemini) to amplify our engineering capability — from code review and debugging to incident investigation and documentation. Real problems — trading systems where performance is measured in microseconds, not user clicksCompetitive package — up to 30 days leave + bank holidays, private health insurance, pension, life insurance, dental/optical cashback, cycle to work, socials and offsitesRemote-friendly — work from home with flexibility. Growth — career progression to senior roles, performance specialisation, or technical leadership. We believe in transparency, honest feedback, and writing things down. We frame AI as empowering people — removing toil, amplifying capability, enabling higher-value work.Stage 1: Initial Conversation with Talent AcquisitionVideo call, ~30-45 minutesVideo call, ~60 minutesVideo call, interactive session, ~60 minutesWhat to expect in each stage will be explained by Talent Acquisition if you’re invited to interview. Please apply directly via this job posting — all applications, including those submitted via LinkedIn, are managed through our applicant tracking system, so you’ll always land in the same place regardless of where you found this role. xwwtmva
We welcome applications from all qualified candidates regardless of age, disability, gender reassignment, marriage or civil partnership, pregnancy or maternity, race, religion or belief, sex, or sexual orientation.Data Protection: By applying, you consent to Reactive Markets processing your personal data for recruitment purposes, in line with our .
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