Senior Full-Stack Engineer

Do Your Life's Best Work If modern wellbeing were redesigned from scratch, it wouldn't live in a GP's office or a cluttered supplement aisle. It would be digital-first, beautifully curated, and powered by data that actually helps you feel your best. That's what we're building at Healf. An ecommerce platform at the intersection of personalised health and curated wellbeing. We connect customers with the world's most effective products across EAT, MOVE, MIND, and SLEEP, and we're just getting started. We combine culture-shaping storytelling, cutting-edge health tech (like our new blood testing platform, Healf Zone), and a best-in-class product experience to help people build rituals that work. Backed by investors behind Soho House, Alo Yoga, Cult Beauty, and Innocent, we're scaling fast, and redefining how the world shops and lives well. About Us At Healf, we're not just a company, we're a movement. Founded by two brothers whose own wellbeing journeys inspired our mission to empower others, Healf is built on grit, determination, and a shared understanding of the power of wellbeing. Our culture is grounded in The Healf Standard—five principles that define how we work and win: We Work Harder Than Anyone Else: Building something that improves lives takes long hours, grit, and sacrifice, but we thrive on it. We all feel energised by what we're building. Never Settle: We challenge the status quo and push ourselves to be better every day. We never settle for mediocrity or the idea that something can't be done. Obsession Over Talent: Talent alone isn't enough—relentless curiosity and a drive to grow set us apart. The Healf Lifestyle: We live what we preach—our personal commitment to wellbeing fuels our professional productivity. Stronger Together: Everyone owns their lane, but we run as a unit. With Healf Zone on the horizon, we're entering the next phase of our journey: closing the loop on health with personalised, preventative care that unlocks longevity and optimised wellbeing. This is your chance to help build something that's not only extraordinary, but a first of its kind. The Role We're looking for a senior full-stack engineer with a strong front-end focus to own the development of our personalisation product — a healthtech platform set to revolutionise wellbeing. You'll be part of a lean, collaborative team where engineers have real ownership, shaping both the customer experience and the technical direction. This is a role for someone who craves the pace and intensity of a high-growth startup — shipping fast, adapting constantly, and thriving on impact. Where You'll Make an Impact Deliver pixel-perfect, production-ready UI using Next.js, React, TypeScript, and Tailwind CSS Translate Figma designs into reusable, accessible, WCAG-compliant components and maintain a shared design system Partner with AI engineers to build robust RAG / LLM-augmented pipelines Implement modern data-fetching strategies (Server Actions, App Router, React Query/SWR) that balance SEO, performance, and scalability Write and maintain automated tests (unit, integration, end-to-end) and strengthen our CI/CD pipelines Work across the stack when needed (API routes, server-side logic, lightweight data modelling) Collaborate closely with design, product, and backend teams to ship quickly and with care Define and uphold engineering best practices around software testing, code quality, and CI/CD standards Set technical direction and guide other engineers in the team through code reviews, mentorship, and pair programming Establish scalable development workflows that promote reliability, maintainability, and collaboration across front-end and back-end teams Partner with leadership and cross-functional teams to continuously improve engineering processes and delivery speed What You'll Bring Mindset & Approach First-principles thinking: You strip problems down to fundamentals and design elegant, scalable solutions Systems mindset: You think in architectures, spotting how pieces fit and scale Relentless execution: You move fast and consistently ship high-quality code Pace appetite: You don't just tolerate startup speed; you crave it and thrive on intensity Product ownership: You care about the "why" as much as the "what," building experiences that transform personalised wellbeing Collaboration & leadership: You work tightly with design, product, and AI, while also guiding other engineers and setting technical direction when needed. Technical Excellence Front-end experience: 3+ years building production React apps, including 1+ year with Next.js and headless commerce (Shopify preferred) Technical fluency: Strong command of TypeScript, modern React patterns (Hooks, Suspense, Server Components), and Tailwind CSS Performance & UX focus: Proven track record of caring about user flows and how performance shapes them Accessibility & inclusion: Experience with accessibility best practices and a genuine commitment to inclusive design Engineering quality: Hands-on with Git and code reviews, plus exposure to automated testing and CI/CD pipelines Bonus Points If You Have Experience with PostHog or other product analytics tools. Deployment experience on Vercel or running Cloudflare Workers at the edge. Familiarity with A/B testing frameworks and experimentation workflows. Why Join Healf Do your life's best work: Build something that matters, with a team that moves fast and aims high Surround yourself with A+ talent: You'll work with high-performers who care deeply and raise the standard every day Be a builder: This isn't a cog-in-the-machine role. You'll help shape our voice, culture, and growth Wellbeing is the lifestyle: From office yoga to Healf Zone insights, everything we do is rooted in our pillars: EAT MOVE MIND SLEEP Premium Wellhub Membership: Unlimited entry to 1000's of gym, yoga, & fitness studios. Exclusive Healf Perks: 50% off all Healf products plus discounted Healf Zone blood testing. Nest Pension: Secure your future with our pension contributions. Wellbeing-Focused Workspace: Incredible Hammersmith office with great natural lighting. Team Connection: Annual company-wide retreat to recharge and bond.