At a Glance
- Tasks: Lead the development of a cutting-edge design system and create pixel-perfect UIs.
- Company: Join StackOne, a dynamic London startup backed by Google Ventures and Workday Ventures.
- Benefits: Be part of a high-calibre team with autonomy and growth opportunities.
- Other info: Work alongside industry veterans from Google and Microsoft in a collaborative environment.
- Why this job: Shape the future of AI integrations while tackling unique performance challenges.
- Qualifications: 4+ years in front-end engineering with expertise in React and TypeScript.
The predicted salary is between 60000 - 80000 £ per year.
StackOne is a $24M Series A London startup building an AI Integration Gateway for SaaS platforms and AI Agents, backed by GV (Google Ventures) and Workday Ventures.
As StackOne’s first dedicated UI Engineer, you will be the authority on craft, polish, and performance. You’ll own the component library, shape micro-frontend architecture, and ensure every pixel reflects best-in-class engineering. Working alongside founders from Google and Microsoft, you’ll build the infrastructure layer that enables the next generation of agentic integrations.
Location: London, UK
Why this role is remarkable:
- Join as the first dedicated UI/UX engineer, owning the entire front-end surface and setting the visual standards for a high-growth infrastructure platform.
- High‑caliber environment backed by $24M from GV and Workday Ventures, founded by veterans from Google and Microsoft who value engineering taste and autonomy.
- Tackle unique performance challenges at the intersection of AI and enterprise integrations, building a system that orchestrates thousands of actions across hundreds of connectors.
What You Will Do:
- Lead the development and stewardship of StackOne’s design system, establishing the visual language, reusable primitives, and performance standards for all user interfaces.
- Ship high‑fidelity, pixel‑perfect UIs using React and TypeScript, while managing micro‑frontend patterns and optimizing Core Web Vitals to ensure industry‑leading latency.
- Collaborate with product and design teams to prototype interactive proofs‑of‑concept, while providing internal tooling and AI rules to help other engineering teams contribute.
The ideal candidate:
- 4+ years of professional front‑end engineering experience with a deep focus on visual craft, design systems, and building production‑scale React applications.
- Expert‑level command of TypeScript, CSS fluency (Tailwind), and modern browser APIs, with a proven track record of migrating or scaling component libraries.
- Strong performance engineering instincts, including experience with monorepo tooling like NX or Turborepo and the ability to optimize backend bottlenecks impacting the client.
Senior UI Engineer at StackOne employer: Jack & Jill
StackOne is an exceptional employer, offering a unique opportunity to be the first dedicated UI Engineer in a high-growth London startup backed by industry giants like Google Ventures and Workday Ventures. With a strong emphasis on engineering excellence and autonomy, employees are encouraged to innovate and tackle complex challenges at the forefront of AI and enterprise integrations, all within a collaborative and supportive environment that fosters professional growth and creativity.
