Full Stack Engineer

Company: Harnham
Apply for the Full Stack Engineer
Location: London
Job Description:

My client are a fast‑growing legal‑tech startup applying Generative AI to the entire IP lifecycle — patents, trademarks, and legal documentation. They build real production systems used by 400+ IP teams globally, including top law firms and major enterprises.

Why they stand out:

  • Series B funded, £55m raised
  • 10x+ ARR growth in the last year, now eight figures
  • Already profitable
  • Scaling rapidly: ~20 → 60 people in London this year

What You’ll Work On

  • AI‑powered legal drafting & document editing
  • Vector search & citation systems
  • Patent litigation tools (claim charts, large‑scale analysis)
  • Professional‑grade legal workflows (not just chat UIs)

The Role

They’re hiring senior Full Stack Engineers, open to backend‑or frontend‑leaning profiles.

  • Build and scale core backend foundations
  • Design APIs and data systems for global scale
  • Work closely with founders on product direction
  • Own complex UIs for AI‑driven legal workflows
  • Heavy work with WYSIWYG editors (TinyMCE / CKEditor)
  • Still hands‑on with backend to deliver end‑to‑end features

What They’re Looking For

  • Strong Python and/or TypeScript and React
  • Top academic background preferred
  • Comfortable moving fast in a startup environment

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Posted: May 17th, 2026