Lead Growth Engineer (£140K - £250K + Equity) at FYXER Ai

Lead Growth Engineer

Salary: £140K - £250K + Equity

Company: Fyxer AI - High growth AI executive assistant ranked in a16z top AI apps

Location: London, UK

Join a high intensity team as a Lead Growth Engineer to own Fyxer AI's growth loops. You will move from strategy to execution, using data driven experiments to optimize onboarding, monetization, and virality. Working with a technical team of 12, you will play a critical role in scaling the product from $30M to $100M ARR.

Why this role is remarkable

• Exceptional traction: Scaling from $1M to $30M ARR in a single year with a lean technical team of just 12 people.
• Market validation: Ranked 7th in Andreessen Horowitz's list of top AI apps, alongside companies valued at $10B+.
• True ownership: You own entire growth loops and strategy with no product managers, providing a fast track to senior leadership responsibilities.

What you will do

• Independently ideate, wireframe, and implement full stack experiments to improve product led growth and seat expansion.
• Analyze quantitative data using Metabase, BigQuery, and PostHog to prioritize your backlog and measure experiment impact.
• Build and optimize viral loops, referral journeys, and revenue operations infrastructure using a modern serverless TypeScript and React stack.

The ideal candidate

• Expert level TypeScript and React skills with the ability to function as a full stack engineer including SQL and DevOps.
• Proven experience in growth engineering, specifically optimizing customer journeys, network effects, and B2B SaaS growth mechanics.
• High intensity mindset with previous experience at an early stage startup (