Full Stack Developer JS

Senior Full Stack Engineer London (Hybrid – 3 days per week) £80,000–£100,000 + Equity We're working with a fast-growing, venture-backed B2B SaaS company building AI-powered workflow and infrastructure software used by modern, scaling organisations. Backed by leading technology investors and founders from some of the world's most successful software companies, they're looking to hire multiple Senior Full Stack Engineers to join their product engineering team. This is a highly product-focused environment where engineers are expected to own features end-to-end, contribute to product decisions, and work closely with design and leadership to shape the roadmap. What You'll Be Doing Building and shipping customer-facing product features from concept through production Working across the full stack using TypeScript, React and Node.js Developing scalable backend services and APIs Contributing to system architecture and technical direction Expanding integrations with third-party platforms and services Collaborating directly with designers, engineers and company leadership Helping drive engineering best practices across a growing team Tech Stack TypeScript React Node.js PostgreSQL Redis Kubernetes What They're Looking For ~3+ years of experience building SaaS products as a Full Stack Engineer ~ Strong JavaScript and TypeScript fundamentals ~ Production experience with React and modern frontend development ~ Comfortable working across frontend and backend systems ~ Experience shipping customer-facing features with high ownership ~ Background in startups, scaleups, or high-growth SaaS environments preferred ~ Strong communication skills and ability to work in collaborative teams Nice to Have Founding Engineer, early engineer, or startup experience Experience with infrastructure and cloud technologies Strong product intuition and design sensibility Personal projects, portfolio, or examples of product craftsmanship Why Join? High-impact role with significant ownership from day one Strong equity package Product-led engineering culture Opportunity to work on AI-powered products Small, highly talented engineering team Clear progression opportunities as the company continues to scale If you're excited by ownership, product thinking, and building software used by thousands of customers, I'd love to speak with you. We unfortunately cannot offer sponsorship for this opportunity