Shape the design system behind a unicorn AI-native SaaS platform, scaling globally at speed.

Why This Role? Stax is partnering with a unicorn AI-native SaaS scale-up that’s transforming how organisations use AI. Now they’re building a London engineering hub . Join as a UK founding engineer - hybrid working, high impact, and the chance to shape a category-defining platform from day one.

The Opportunity This is a systems-level role at the intersection of design and engineering. You’ll be at the heart of a platform that’s changing how organisations use AI for customer support and product operations.

In just four years, the team has: Pushed browser limits with D3-powered visualisations and real-time dashboards Open-sourced client-side analytics on DuckDB, bringing OLAP to the edge Built AI-native UIs that feel fast, intelligent, and fun Scaled a themeable design system adopted across multiple products and platforms Introduced micro-frontends that power independent, high-velocity teams—and let customers embed their own modules directly in the product