Senior Software Engineer

Senior Fullstack Engineer £450–500 per day 6 months Outside IR35 London – 2 days per week on site We’re supporting a high-growth, AI-driven product business building a scalable platform from the ground up. They operate as a small, high-calibre team with high standards, low bureaucracy, and real ownership. They’re looking for a Senior Fullstack Engineer (back end leaning) to take responsibility for core backend systems and help shape product direction in fast-moving environment. This is a role for someone who is comfortable building without perfect specs and takes initiative naturally. Requirements Strong Node.js and GraphQL (NestJS) experience PostgreSQL, Prisma, and solid data structures / OOP fundamentals Experience building high-concurrency, event-driven systems GCP experience (Terraform desirable) Experience working with AI/LLMs in production environments Strong focus on system reliability (monitoring, alerting, logging, testing, incident-aware design) Demonstrated ownership of features or systems end-to-end, with the ability to operate independently Comfortable making progress in environments with evolving or incomplete requirements Pragmatic approach to delivery — able to balance speed with long-term maintainability Proven ability to operate effectively under pressure or shifting priorities Ideally has built, launched, or scaled a product, startup, or meaningful side project41bf1e1f-b16b-4260-a40a-17c77a06fd15…