Founding Software Engineer

Founding Software Engineer | AI Agents | San Francisco or London

Location: San Francisco, CA or London, UK (London-based candidates must be willing to relocate to San Francisco in 2026)

This is a genuine Founding Engineer opportunity to join an Andreessen Horowitz-backed AI startup as Engineer #2/3.

Already trusted by Fortune 500 customers including a trillion-dollar enterprise you'll help build enterprise-grade AI agents that solve one of the most challenging problems in business automation: transforming highly unstructured data into fully auditable outputs using cutting-edge LLMs and agentic AI.

This isn't another AI startup building chatbots. It's an opportunity to own products end-to-end, influence technical direction, and help shape the future of a rapidly growing company from the earliest stages.

You'll enjoy this role if you:

• Love building products from the ground up.
• Thrive in fast-moving startup environments.
• Want genuine ownership rather than simply delivering tickets.
• Enjoy solving complex engineering problems with modern AI technologies.
• Want direct exposure to founders, customers and product strategy.
• Aspire to build or lead a company one day.

We're looking for engineers who have:

• 4+ years' commercial software engineering experience (flexible for exceptional candidates).
• Built and shipped AI-driven or agentic products into production.
• Strong TypeScript experience.
• Commercial AWS experience.
• Full-stack product ownership.
• Enterprise SaaS or B2B product experience.
• A passion for building in early-stage startups.

Location

We're keen to hear from engineers who are:

• Already based in San Francisco or the wider Bay Area.
• Based in London and excited by the opportunity to relocate to San Francisco in 2026.

Package

• $Competitve base salary
• 0.81.2% equity
• Genuine Founding Engineer position
• Opportunity to shape engineering culture and technical direction
• Work directly alongside experienced founders solving real enterprise AI challenges

If you're looking for a role where you'll have genuine ownership, meaningful equity and the opportunity to build category-defining AI products, I'd love to have a confidential conversation.