Lead Engineer Equity at Fyxer AI

Lead Growth Engineer

Salary: £140K – £250K + Equity

Company: Fyxer AI – High‑growth AI executive assistant ranked #7 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.

• 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.

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

• Expert‑level Type Script and React skills with the ability to function as a full‑stack engineer including SQL and Dev Ops.
• 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 (