Lead Fullstack Engineer
12 days ago
Saint Ives
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.