Senior Frontend Engineer

🕒 July 28

🇬🇧 United Kingdom – Remote

⏰ Full Time

🟠 Senior

💻 Frontend Engineer / Web Developer

👻 Ghost score 27%

What it means: how likely this posting is sitting open without active hiring.How to read it: 60% or higher means we think this is a ghost. Lower scores are less of a worry.How we score it: age, reposts, open roles vs team size, how fast jobs close, and whether pay is listed.Fine print: an estimate from public data, not a judgment of the company. Real jobs can score high, so treat it as a hint, not a fact.

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Reactive Markets

WebsiteLinkedInAll Job Openings

11 - 50 employees

Founded 2019

💳 Fintech

🤝 B2B

💸 Finance

Fintech • B2B • Finance

Reactive Markets is a financial infrastructure company that provides ultra-low-latency connectivity and execution for institutional trading across FX, equities and other asset classes. Its network connects clients to 35+ liquidity providers with deterministic sub-50 microsecond end-to-end latency, accessible via a single API, UI, or integrations with EMS/OMS/pricing engines. The platform is engineered for bilateral trading, systematic and manual strategies, and offers real-time latency reporting, analytics, global deployment (New York, London, Singapore), and FCA-regulated services for professional market participants.

📋 Description

• Build the trading platform our clients use every day • Own complex, ambiguous, performance-critical work end-to-end • Lead through code, craft, and mentoring • Design, build, test, deploy, and support in production • Investigate and fix issues as part of the team

🎯 Requirements

• Strong full-stack engineering ability with deep TypeScript / JavaScript (ES6+) (5+ years) • Solid experience with React and reactive state management (RX, MobX, or similar) • Real working ability in Rust • Strong grasp of distributed systems, API design, and real-time data (REST, WebSockets, network protocols such as TCP/UDP and binary protocols) • Comfortable reasoning about architecture and making defensible technical trade-offs • Python for scripting, automation, and tooling is a bonus • Git and Linux fundamentals • Experience in financial services or trading technology is a plus but not essential.

🏖️ Benefits

• up to 30 days leave + bank holidays • private health insurance • pension • life insurance • dental/optical cashback • cycle to work • socials and offsites