Software Engineer

Founding Software Engineer – AI Voice Agents – London office based – upto £250k

Ever built something from zero and watched it become the backbone of a company?

Love owning a problem end to end - from customer conversation to shipped code?

Want to work with cutting-edge AI in a business that's actually scaling, not just theorising?

If that sounds like you, keep reading.

The Challenge

This is a Series A startup (fresh off a $13m raise, YC-backed) building AI voice agents for trades businesses - agents that answer calls, handle WhatsApp and email, take bookings, process payments, and run the CRM the way a human would.

Revenue's growing ~30% month on month. They've gone from founders living and breathing AI in San Francisco to a business shipping fast and scaling hard. Now they need a founding engineer to help build the next chapter.

This isn't a "nice to have" hire. You'll shape how the product works, how the team operates, and how the company grows.

What You'll Be Building

• Core product features across the stack - Python, TypeScript, cloud infra, event-driven systems, third-party integrations
• Solutions owned end to end - working directly with customers to understand needs, scope the build, and deliver outcomes
• The right thing at the right speed - hacking an MVP when speed wins, investing in scalable foundations when it counts
• A team that raises its own bar - testing, documentation, reliability, security, done properly and shared with others

Why This Role Is Different

• Founding-level ownership from day one, not just a seat on the team
• Real customers, real revenue, real problems - not a lab experiment
• A business moving fast with the funding to back it
• Genuine influence over the product and the culture as the team scales

About You

• Strong software engineering fundamentals - you can design, debug, and ship reliable systems
• Proficient in Python or TypeScript (or clear proof you can pick up what's needed)
• Experience shipping AI products end-to-end - startup, side project, open source, or at scale
• Comfortable across the stack - frontend, backend, infra, wherever the problem is
• Confident working directly with customers or non-technical stakeholders to scope and deliver
• A track record that shows drive - something you've launched, contributed to, or taken ownership of when nobody else would

Bonus if you have:

• Early-stage startup experience, especially in AI, voice platforms, or event-driven systems
• Familiarity with modern cloud infra - Kubernetes, serverless, distributed systems
• Evidence of customer empathy - support, founder, or just building things that solved real pain

What's on Offer

• Competitive salary & equity
• AI-focused learning & development
• Team socials & annual offsites (last year: Greece)
• Private healthcare

Interested?

Apply directly or reach out to me for a confidential chat:

📧 [email protected]

📞 0203 773 6498