Senior Backend / Full-Stack Engineer (E5/E6 Level) - AI-Native Startup - Strong Comp + Equity

My client, a high-growth AI-native startup based in Central London, is looking for an exceptional Senior Backend or Full-Stack Engineer to join their core engineering team.
This is a rare opportunity to join an engineering-led company at an early but high-traction stage, working directly on business-critical AI and communications infrastructure used in real-world production environments.
The company operates as a genuinely AI-native engineering organisation. AI tooling, LLM-powered workflows, and rapid iteration are deeply embedded into how the team builds products day-to-day. 5+ years of software engineering experience in high-performance production environments
• Strong backend or full-stack engineering skills
• Experience building scalable distributed systems and production infrastructure
• Experience with TypeScript / Node.js strongly preferred
• Experience with modern frontend frameworks (React / Next.js) is a plus for full-stack candidates
• AI-native mindset — comfortable leveraging AI tooling and rapid iteration workflows
• European language skills required (Spanish strongly preferred)
• Must be willing to work fully onsite from the company’s Central London office
TypeScript, Node.js, React, Next.js
• AI-native workflows and internal LLM tooling
• Excellent compensation + meaningful equity
• Centrally located Marylebone office
• Premium gym membership
• This role is ideal for engineers who want to build quickly, solve difficult technical problems, and help shape the foundations of a high-growth AI company from an early stage.