numi
Software Engineer
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Build a payments platform from a blank page
numi is partnering with a major UK payments business that is being carved out of a tier 1 bank to become a standalone technology company. It already handles a huge share of UK card payments every day. Now it is rebuilding the technology behind them, from scratch.
This is not a legacy banking role. The old mainframe and batch estate stays behind. In its place: a cloud-native, event-driven platform, built by a permanent engineering team that will grow to 100–200 engineers. The people who join now will shape how that team works.
The engineering
• Kotlin for ~90% of the back end, Rust where it's time-critical and must be provably correct • TypeScript, React and React Native on the front end • AWS, Kubernetes, Istio, NATS and Databricks • Event-driven and real-time: no batch jobs, async wherever possible • Continuous delivery: 46 engineers averaged ~60 deploys a day ahead of the first production releases • The aim is that every engineer ships to production on day one
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What you'll do
• Design, build and run production services, end to end • Shape technical decisions, architecture and engineering standards • Work in cross-functional, outcome-aligned teams that choose their own ways of working • Help build the culture of a brand-new engineering organisation
Hiring is open across the full ladder, from Associate to Principal. You don't need to pick a level: it's calibrated with you through the process.
What they're looking for
• Distributed systems experience in a cloud-native, event-driven, continuously delivered environment • Kotlin or strong JVM experience (an interest in Rust is a bonus) • You've built something from zero: a product, platform, team or capability • Comfortable with ambiguity and making progress on imperfect information • Low ego: confident enough to hold an opinion, humble enough to change it
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Payments experience is not required. The environment you've worked in matters more than the logo on your CV.
The process
Fourteen days from first conversation to offer: a call with numi, a remote interview, a take-home exercise (AI tools welcome, as long as you can explain every line), then an in-person final.
Salary: £60,000 – £120,000+ depending on level. London, hybrid (2–3 days in office).
Please note: visa sponsorship is not available.
Interested? Apply here.
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