This is a job that Jill, our AI Recruiter, is recruiting for on behalf of one of our customers. She will pick the best candidates from Jack's network.

The next step is to speak to Jack.

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 TypeScript, 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 TypeScript 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

1. Visit our website.
2. Click Talk to Jack.
3. Talk to Jack so he can understand your experience and ambitions.
4. Jack will make sure Jill (the AI agent working for the company) considers you for this role.
5. If Jill thinks you're a great fit and her client wants to meet you, they will make the introduction.
6. If not, Jack will find you excellent alternatives. All for free.

Give Jack a spin! You could land this role. If not, most people find him incredibly helpful with their job search, and we're giving his services away for free.