AI-first Senior Product Engineer

About Mindstone

Mindstone is building the reference company for AI transformation. We live in the future we are building - using AI every day to run the company, then helping others adopt it. Profitable, venture-backed, and growing fast.

An AI-first, product-minded, deeply hands-on Senior Product Engineer. You will own problems end-to-end: understand the user need, make product and design calls, build across the stack, ship, and measure. Working directly with the CTO.

• Shipping features end-to-end across Rebel, used daily by real teams
• Making autonomous product and technical decisions
• Working directly with LLMs, agents, and MCP integrations
• Contributing to our open-screen ecosystem
• Helping shape engineering standards and culture as the team grows
• Mentoring and setting the bar for quality

• Shipped meaningful product that real people use, recently and repeatedly
• Think and work AI-first: daily use of Cursor, Claude Code, or equivalent
• Full-stack in practice: comfortable from backend systems to frontend product
• Make good product decisions independently, not just technical ones
• Based in or near London, 2 days/week minimum in office

• Type Script, Electron, or desktop app experience
• Built or integrated AI/LLM features in production
• Previous startup experience (10-50 person team)
• You have hired or mentored, or want to start

• Competitive salary + up to 30% monthly bonus tied to company performance
• Possibility of meaningful equity in a profitable, venture-backed company
• 25 days holiday plus bank holidays plus Christmas week
• Quarterly Swarm Weeks across Europe
• Hybrid London-based - 2 days/week minimum

We are committed to building a diverse team and actively encourage applications from candidates of all backgrounds. We particularly welcome applications from underrepresented groups in tech.