Founding Full Stack Engineer (Python/TypeScript) - London - £180K plus equity

Founding Full Stack Engineer (Python/TypeScript) – London - £180K plus equity

Halian is currently working with a stealth-stage AI startup is hiring its first technical team member. If you want to build core AI systems from the ground up and move faster than a typical tech organisation ever allows, this might be for you.

What you’ll be doing

·Architect core infrastructure and data pipelines

·Build integrations with external APIs and providers

·Develop internal tooling and contribute directly to product roadmap decisions

·Work across backend, frontend, data, and cloud systems

·Solve high-impact problems (including the ones we haven’t discovered yet)

Tech you’ll work with

·Python + TypeScript/Node.js (in equal measure)

·API integrations, ETL, schema validation

·React/TypeScript, Supabase, AWS

·Data quality systems and pipeline tooling

·Whatever the mission requires — we optimise for impact, not rigidity

What matters most

· Ownership: You think like a founder. You ship fast, iterate quickly, and take full responsibility for your domain.

· Scrappiness: It’s a startup — backend, frontend, DevOps, customer conversations… you jump in wherever needed.

· Energy: High-energy, positive mindset, and excitement about building infrastructure for AI.

· Flexibility: Comfortable with a constantly evolving stack and shifting priorities.

· Experience: 3–5 years as a software engineer in high-growth startups.

You’ll fit in well if you

· Have high urgency: You don’t wait for instructions — you identify problems, create solutions, and drive execution.

· Have a strong track record: Excellence shown academically, professionally, athletically, artistically, or elsewhere. You hold yourself and your team to a high bar.

What they offer

·Founding team status + meaningful equity

·Opportunity to build major components of the product from scratch

·Ambitious, high-performance culture — we build to win

·Competitive compensation

If you meet the above criteria and would like to be considered for this role then please click apply now.