Senior Full-Stack Software Engineer
London (Victoria) · 3 days in office · £100,000 – £120,000 · Permanent
Our client is a newly launched, VC-backed tech business operating in a highly traditional professional services sector. Founded by repeat founders with a track record of building and scaling high-growth, category-leading consumer businesses, they are using AI and automation to fundamentally reimagine how services in their space are delivered.
The opportunity
This is a rare greenfield engineering role at a genuinely early‑stage business. The successful candidate will join a small, senior founding team and take real ownership of the technical foundation from day one — building the stack, setting the architecture, and establishing the patterns that everything else will be built upon.
The role spans customer‑facing product, backend automation, AI agent orchestration and internal tooling — with significant scope to grow as the business scales.
What you'll be doing
* Building the customer‑facing platform from the ground up — timelines, task‑based views and embedded AI assistance
* Owning backend automation workflows, AI agent orchestration and data pipelines
* Building internal tooling to support the team in reviewing and approving AI‑generated work
* Setting engineering patterns and architecture that future hires will build on
What we're looking for
* 5+ years building modern web applications with a strong backend emphasis
* Strong command of React/Next.js and Python/TypeScript
* Experience with AI agent orchestration frameworks (e.g. LangGraph, OpenAI Agent SDK)
* The architectural judgment to make confident decisions on a fast‑moving, greenfield stack
* A background in high‑growth, VC‑backed startups — you thrive in fast, dynamic environments
* London‑based with existing right to work in the UK (visa sponsorship not available)
Why this role
* A true ground‑floor opportunity at a well‑funded, early‑stage business disrupting a traditional sector
* Founding team with a proven track record — previously built one of the UK’s fastest growing consumer brands
* Backed by respected VC funds with a recent funding round closed
* Real ownership and influence over product and architecture from day one
* Work at the cutting edge of AI and automation in a sector r e a t e
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