Lead Growth Engineer (£140K – £250K + Equity) at Fast-growing AI productivity startup

Company: Jack & Jill
Apply for the Lead Growth Engineer (£140K – £250K + Equity) at Fast-growing AI productivity startup
Location: London
Job Description:

Lead Growth Engineer

Salary: £140K – £250K + Equity

Company Description: Fast‑growing AI productivity startup

Location: London, UK

Job Description

You will lead product‑led growth by owning the strategy and execution of growth loops. Working independently without PMs, you’ll leverage a modern TypeScript stack to build experiments across onboarding and monetization journeys. This high‑intensity role offers the chance to scale a top‑ranked AI application toward its goal of $100M ARR.

Why this role is remarkable

  • Join a company ranked among the top global AI applications based on real startup spending data.
  • Exceptional growth trajectory, scaling from $1M to $30M ARR in a single year with a lean technical team.
  • Total ownership of growth strategy and implementation without the bureaucracy of product managers.

What you will do

  • Autonomously design and implement experiments to improve viral loops and product‑led growth mechanics.
  • Analyze qualitative and quantitative data from Metabase and PostHog to prioritize high‑impact backlogs.
  • Build and optimize full‑stack features using a serverless TypeScript, React, and Firebase architecture.

The ideal candidate

  • Proficient in TypeScript and React with the ability to function as a high‑velocity full‑stack engineer.
  • Proven track record in growth engineering, including optimizing customer journeys and revenue operations infrastructure.
  • Strong background at early‑stage tech companies or as a founder with a deep interest in AI agents.

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Posted: May 27th, 2026