Staff or Senior Product Engineer (£100k-£150k + Equity) at VC-backed AI legal tech startup

Company: Jack & Jill
Apply for the Staff or Senior Product Engineer (£100k-£150k + Equity) at VC-backed AI legal tech startup
Location: London
Job Description:

Job Title

Staff or Senior Product Engineer

Salary

£100k-£150k + Equity

Company Description

VC-backed AI legal tech startup

Job Description

You will join an early engineering team building a next-generation platform designed to modernize traditional professional services through AI. As a generalist, you will shape product direction, build sophisticated LLM-powered systems, and ship production features within your first week. This role is ideal for high-standard engineers who thrive in fast-paced startup environments.

Location

London, UK

Why this role is remarkable

  • Join a well-funded venture led by a second-time founder with a proven track record of scaling regulated platforms to massive volume.
  • Work at the frontier of AI application, building a full-stack, AI-native service that replaces legacy workflows with sophisticated automated agents.
  • Receive meaningful early-stage equity in a high-growth company tackling a multi-billion pound market with a modern TypeScript and React stack.

What You Will Do

  • Architect and deploy complex AI-powered systems and LLM agents that handle intricate, high-stakes professional workflows beyond simple prompting.
  • Own the end-to-end product lifecycle, from talking to users and forming hypotheses to shipping high-quality code into production weekly.
  • Scale a robust TypeScript monorepo and event-driven architecture using React, tRPC, and Inngest to support rapid product iteration.

The ideal candidate

  • Previous experience at an early-stage startup where you successfully drove product direction and managed ambiguous technical requirements.
  • Expert proficiency in TypeScript and the modern web ecosystem, with the ability to maintain high engineering standards while moving fast.
  • A relentless focus on user impact and problem-solving, with a hands-on approach to refining AI-driven features and production-ready machine learning applications.

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Posted: July 27th, 2026