JavaScript Engineers | Build the Future of Global Payments (Tech For Good) | Full Stack | £150K + Equity | Node.js / TypeScript / React.js | 5 Days Per Week London

I am looking for an exceptional engineer to take ownership of a mission-critical payments platform, powering real-time money movement for high-value clients around the world.

This isn’t a sandbox. This is live infrastructure. Every line of code you write will move real money, for real businesses, in real time.

You’ll sit at the heart of a fast-scaling payments ecosystem, designing and operating systems that bridge fragmented financial networks and make them feel seamless.

Real Impact, Instantly

Your work won’t sit behind feature flags for months. You’ll ship fast, go live quickly, and see your systems handle meaningful transaction volume from day one.

Solve the Hard Stuff

You’ll be working with complex, inconsistent external systems — turning unreliable APIs into rock-solid infrastructure. Expect edge cases, ambiguity, and problems that don’t have obvious answers.

Full Ownership

From integration to production performance, you own the outcome. You’ll design, build, monitor, and continuously improve systems end-to-end.

Scale That Matters

Help lay the foundation for cross-border financial infrastructure across rapidly growing markets — starting with key regions and expanding far beyond.

What You’ll Be Doing

• Designing and building robust backend services that power high-volume transaction flows
• Integrating with multiple third-party payment systems and making them reliable
• Investigating and resolving live transaction issues under real-world conditions
• Creating monitoring, alerting, and failover systems that prevent problems before they escalate
• Shipping new integrations at pace while maintaining system stability
• Improving the developer experience for clients using your APIs

What You Bring

• Experience building or working on payment systems, fintech products, or transaction-heavy platforms
• Strong backend engineering skills, with the ability to operate across the full stack when needed
• Confidence working in fast-moving environments where priorities shift and systems are live
• A mindset focused on resilience — you think in terms of failure modes, not just happy paths
• Ability to debug under pressure and communicate clearly with both technical and non-technical stakeholders
• A bias for action — you ship, iterate, and improve continuously

Problems You’ll Tackle

• Making unreliable external systems behave like dependable infrastructure
• Detecting and resolving issues before customers ever notice them
• Scaling systems without constant rewrites
• Balancing speed with long-term reliability
• Designing APIs that developers actually enjoy using

What You Get

• Up to £150K + meaningful equity
• Access to a major global tech hub (with international opportunities)
• Work on systems with real global reach
• Regular team gatherings, off-sites, and a genuinely social culture