Lead Fullstack Engineer
Lead Full-Stack Engineer
£50,000-£75,000 plus bonus and benefits
St Ives, Cornwall
We're working with a founder-led HR technology business to find a Lead Full-Stack Engineer to join them at a pivotal moment in their growth. Their AI-powered SAAS platform is already in the hands of design partners, has clear commercial traction, and is positioned to become the category leader in a space that is moving fast.
You'll be the technical lead on the platform build, working directly with the founder to ship features that reach board-level buyers at some of the UK's leading businesses. As Lead Full-Stack Engineer, you'll have real ownership over architecture decisions and a genuine voice in what gets built next.
Responsibilities as a Lead Full-Stack Engineer:
- Build and maintain the platform in Next.js, owning frontend delivery end to end
- Deploy and manage infrastructure on Vercel with Cloudflare for edge networking and performance
- Work with Supabase and PostgreSQL-backed data layers to support core product logic and reporting
- Integrate LLM APIs and AI gateway tooling to power intelligent scoring, generation and insight outputs
- Implement and maintain auth flows using Clerk or equivalent modern auth platforms
- Contribute to headless CMS architecture and custom content tooling
- Shape architecture decisions as the platform scales, including the move toward a serverless, API-first approach
- Have a genuine voice in what gets prioritised, this is a small team and your input matters
Lead Full-Stack Engineer Requirements:
- Solid Next.js experience and comfortable owning a frontend codebase in a serverless, no-backend environment
- Hands-on experience with Vercel, Supabase or comparable modern deployment and BaaS platforms
- Proven experience integrating LLM APIs and AI gateway tooling (OpenAI, Anthropic, Gemini or similar) into production applications
- Strong JavaScript or TypeScript fundamentals
- Experience with auth platforms such as Clerk, Auth0 or similar
- Familiarity with Cloudflare and edge networking principles
- Comfortable in an early-stage environment where you'll wear more than one hat
- An interest in AI literacy, workforce capability or assessment products is a genuine plus
Why apply as a Lead Full-Stack Engineer?:
- Build something from the ground up with real commercial traction already behind it
- Work directly with the founder with meaningful input into product direction
- Premium AI tooling from day one, this is an AI-native build
- Hands-on experience with a modern stack across Vercel, Supabase, Cloudflare and LLM APIs
- Hybrid working with flexibility built in
- Real scope to grow as the platform scales from design partners to enterprise
If you're a Lead Full-Stack Engineer who wants early-stage ownership on a product with genuine market timing behind it, get in touch now.
Due to the high volume of applications, not all applicants will receive feedback.