Senior Backend Engineer (NodeJS) | 80-90k | Healthtech AI Startup | Hybrid (x3 days pw in Borehamwood)

Senior Backend Engineer (NodeJS) | 80-90k | Healthtech AI Startup | Hybrid (x3 days pw in Borehamwood) Role: Senior Backend Engineer Salary: 80-90k (+ shares) Location: x3 days pw in Borehamwood (25–45 min direct train from central London)** plan to move office to Central Ldn in less than 12 months ** Tech stack includes: NodeJS, AWS, MySQL, Websockets, Terraform, CDK Team: CTO (ex Meta) & x1 Full Stack Engineer This is a seed-stage startup building an AI voice assistant for GP practices. The product answers patient calls, performs triage, and automatically fills in NHS system forms. They’ve recently secured funding and are scaling quickly, with a small engineering team growing from 2 to 4. Currently handling 5,000+ daily calls, integrating with multiple NHS systems, and building scalable backend infrastructure. Early engineers will have significant ownership over system design as the product grows. Role Responsibilities: Build and maintain backend systems, particularly integrating multiple external systemsScale infrastructure to support increasing call volumesDebug and improve reliability across NHS software integrationsWork with third-party AI providers Must-have: 5+ years experience - must have NodeJS, flexible with background in other languages.Embraces using AI tools (e.g. Cursor, agents, automation) in day-to-day development Nice-to-have: Experience working with LLMs, voice tech, or speech-to-text systems