Lead Product Engineer Equity at Fyxer AI

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Lead Product Engineer

Salary: £140K – £250K + Equity

Company

Description:

Fyxer AI - Series A pure-play applied AI company backed by Marc Benioff, Madrona, and Lakestar.

Job Description: Join a high-intensity team of 12 engineers that scaled from $1M to $30M ARR in just one year. As a Lead Product Engineer, you will own entire product areas without PM interference, building sophisticated AI-generated email systems that currently automate 53% of user drafts for a global professional audience.

Location: London, UK

Why this role is remarkable:

• Ranked 7th in Andreessen Horowitz’s list of top AI apps based on real spend data, alongside $10B+ companies.
• Extraordinary growth trajectory from $1M to $30M ARR in 2025, with a clear path to $100M ARR by 2026.
• Massive ownership with zero bureaucracy, no product managers, and company-wide deep-work focus time until 3pm daily.

What you will do:

• Lead the end-to-end development of core AI features using Type Script, fine-tuned open-source models, and RAG architectures.
• Drive product strategy by translating ambiguous user problems into high-impact technical solutions without needing external specifications.
• Build and optimize scalable infrastructure to support rapid user growth while maintaining elite engineering standards and craft.

The ideal candidate:

• 5+ years of experience shipping production software with deep expertise in Type Script or Python and end-to-end system ownership.
• Proven track record of building and deploying modern AI/ML solutions, including LLMs, embeddings, and inference optimization.
• Founder-level mindset with a bias for action, comfortable operating with extreme autonomy in a fast-paced, high-stakes environment.

Next steps

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