🔥Senior Full Stack Engineer (Backend Ownership)🔥
🧨Early Series A AI Startup – Fast Growth Phase🧨
đź“ŤRemote (UK-based)
💰 Up to £120k + strong equity upside (with potential early liquidity within 12–18 months)
A high-growth AI startup is building the infrastructure layer that helps enterprises turn AI initiatives into real, production-grade business impact.
The platform empowers teams to discover, compose, and deploy AI agents at scale, with strong enterprise-grade reliability, observability, and control. The product is already live with early enterprise customers and is now entering a rapid scaling phase.
We’re hiring a Senior Full Stack Engineer (backend-leaning) to take ownership of core systems and help define how AI-native platforms are engineered at scale.
🚀 Why this role is compelling
✔️ Early Series A company already working with enterprise customers in production
✔️ Significant ownership of backend architecture and key product components
✔️ AI-native stack built around LLMs, agents, and real-time workflows
✔️ Small, high-calibre engineering team with strong technical standards
✔️ Full-stack responsibility spanning backend systems and frontend experience
✔️ Meaningful equity with strong upside potential
🛠️ What you’ll be doing
• Own and deliver end-to-end product features across backend, frontend, and infrastructure
• Build and scale Python-based backend services powering AI workflows (FastAPI or similar)
• Design async, event-driven systems and complex stateful workflows
• Develop intuitive UX for AI products using React / TypeScript / Next.js
• Partner closely with Product, Design, and ML/AI teams
• Improve system reliability, observability, performance, and testing practices
• Contribute to technical direction and engineering best practices
• Support and mentor other engineers through reviews and collaboration
⚙️ Tech Stack
Backend (primary focus):
•Python (FastAPI or similar), async systems, distributed architecture, API design
Frontend:
•TypeScript, React, Next.js
Data layer:
•Postgres (schema design, migrations, optimisation)
AI / Platform (bonus exposure):
•LLM integrations (function/tool calling)
•Streaming systems for real-time UX
•Vector databases
•Agent-based workflows and state management
Security & Auth:
•OAuth / OIDC, JWT, RBAC / ABAC
✅ What we’re looking for
• Strong senior-level experience building production web applications
• Deep backend experience in Python (FastAPI or similar frameworks)
• Solid capability in TypeScript and React
• Experience with SaaS platforms including auth and permissions
• Exposure to LLMs / AI systems is a plus (not essential)
• Strong understanding of databases, especially Postgres
• Comfortable working in ambiguous, fast-moving environments
• Strong communication across technical and product stakeholders
🌱 Why join
This is a chance to join at a critical scaling point in a company building the infrastructure layer for enterprise AI adoption.
You’ll have real ownership over core systems, influence over product direction, and the opportunity to help shape a category-defining platform from an early stage.
The team is small, technically strong, and moving quickly, with a strong emphasis on engineering quality and meaningful impact.