Senior Product Growth Engineer (£65k-£80k + Equity) at readywhen

Job Title

Senior Product Growth Engineer

Salary

£65k-£80k + Equity

Company Description

readywhen.ai is a London-based pre‑seed AI startup building the first “senior AI employee” for small‑business owners. The platform connects to existing business tools to automatically draft client updates, proposals, and reports based on real‑time context, eliminating the need for manual prompting or complex setup for busy founders.

Job Description

Join readywhen.ai as our first dedicated growth hire to own the product loop from code to conclusion. You will bridge the gap between engineering and GTM, building fast‑paced experiments, instrumenting the activation funnel, and driving retention. This is a high‑autonomy, full‑stack role for a senior engineer who thinks like a founder.

Location

London, UK

Why this role is remarkable

• Join a high‑velocity, pre‑seed team as the first growth hire, directly influencing the product’s trajectory and core business metrics from day one.
• Work at the cutting edge of AI‑assisted development, utilizing tools like Claude Code and Cursor to accelerate shipping while building a truly autonomous AI product.
• Enjoy complete ownership over the growth stack, from building experiment scaffolding to performing statistical analysis, without the friction of traditional PM specifications.

What You Will Do

• Optimize the end‑to‑end activation funnel by identifying user drop‑off points and shipping rapid, data‑driven fixes to improve onboarding momentum.
• Design and build a robust experimentation framework using tools like GrowthBook or PostHog to run scientifically‑driven A/B tests behind feature flags.
• Own the company’s data integrity by designing Amplitude event taxonomies and building automated lifecycle messaging flows to drive long‑term user retention.

The ideal candidate

• Brings senior‑level experience shipping growth features at B2B or prosumer startups, with a proven track record of moving activation and retention metrics.
• Expert in TypeScript, React, and SQL, with the ability to query your own data and write clean, reviewable production code.
• Exhibits a founder mindset, capable of identifying high‑impact bets independently while maintaining enough architectural respect to know when a fix belongs in an experiment.

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