Full Stack Engineer (Python and React)

Harnham - Data & Analytics Recruitment
London, United Kingdom
Today
£70,000 – £180,000 pa

Salary

£70,000 – £180,000 pa

Job Type
Permanent
Work Pattern
Full-time
Work Location
On-site
Seniority
Senior
Education
Degree
Posted
30 Apr 2026 (Today)

Benefits

Equity
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Full Stack Engineer

LegalTech / GenAI

London (5 days onsite)

Between £70,000 - £180,000 + Equity

The Company

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
  • Alreadyprofitable
  • Scaling rapidly: ~2060 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 hiringsenior Full Stack Engineers, open tobackend- 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 withWYSIWYG editors (TinyMCE / CKEditor)
  • Still hands-on with backend to deliver end-to-end features

What They're Looking For

  • StrongPython and/or TypeScript and React
  • Solid full-stack fundamentals
  • Top academic background preferred
  • Comfortable moving fast in a startup environment
  • Happy beingin the office 5 days a week

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