We're working exclusively with a fast-scaling, internationally established B2B SaaS business to find a Senior Full-Stack Engineer who wants to do more than just ship code; someone who wants to help shape a platform.

The Platform

This isn't a greenfield start-up with no traction, nor a legacy enterprise stuck in technical debt. It's something rarer: a mature, mission-critical SaaS platform mid-way through a significant cloud-native rebuild, with real customers, real revenue, and a serious engineering team that knows what it's doing.

The platform powers high-value, high-volume transactional operations globally; think live, real-time environments where reliability isn't a nice-to-have, it's the product. £50m+ transacted in 2026 alone. Clients operate across multiple sectors and international markets.

The Role

You'll work closely with the Lead Software Engineer and product leadership to extend and evolve the next-generation platform across:...