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. The engineering culture is highly execution-focused, fast-moving, and extremely hands-on. They are specifically looking for engineers operating at roughly Meta E5/E6 level (or equivalent from companies such as Meta, WhatsApp, Shopify, Stripe, Revolut, Deliveroo, etc.) with strong product engineering instincts and deep technical ability. The ideal candidate is a highly capable senior engineer who combines startup velocity with strong systems thinking and enjoys operating in high-ownership environments. You will work directly alongside the CTO (ex-JP Morgan) and Head of Engineering (ex-Meta) on core architecture, product direction, and scaling challenges. Requirements: • 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 • Strong product engineering mindset with ability to move quickly and own features end-to-end • Experience with TypeScript / Node.js strongly preferred • Experience with modern frontend frameworks (React / Next.js) is a plus for full-stack candidates • Strong understanding of system design, reliability, scalability, and observability • Experience in startups or fast-paced product environments is highly desirable • AI-native mindset — comfortable leveraging AI tooling and rapid iteration workflows • Strong communication skills and ability to operate autonomously • European language skills required (Spanish strongly preferred) • Must already have right to work in the UK or Europe — visa sponsorship is not available outside Europe • Must be willing to work fully onsite from the company’s Central London office Tech Environment: • TypeScript, Node.js, React, Next.js • AI-native workflows and internal LLM tooling • Distributed systems and real-time infrastructure • OpenSearch, SingleStore, Trigger.dev, Axiom • Modern cloud-native infrastructure and observability stack What they offer: • Excellent compensation meaningful equity • High-ownership environment with direct impact on product and architecture • Small, elite engineering team • Direct collaboration with experienced leadership (ex-Meta / ex-JP Morgan) • Centrally located Marylebone office • Premium gym membership • Fast-moving, ambitious startup environment with strong backing 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. To apply, please send your CV or contact directly.41bf1e1f-b16b-4260-a40a-17c77a06fd15