Principal Engineer

Job description

Principal Engineer - Series A Scale Up - Up to £270,000

I'm currently looking for a Principal Engineer to join a high-growth, YC-backed AI startup based in London.

It's a hands-on IC role focused primarily on scalable backend systems and genuinely at scale.

You'll be working directly with the Head of Engineering and CTO/Co-Founder — your impact will be visible and felt from day one. They're looking for someone who has taken companies from Series A through to Series C on multiple occasions; someone who has walked into complex, high-pressure environments, diagnosed the problems, fixed them, and unlocked the next phase of growth. This is about scaling products, not just teams.

Tech Stack: Python · FastAPI · React · TypeScript · GCP

Salary: £190,000 - £270,000 + Equity

Working Arrangements: 3 days per week in Central London office

Why it might interest you

• YC-backed and scaling fast, adding 10 heads to engineering over the next few months
• Real AI in production (not just R&D)
• Smart, driven team of builders — ex-Meta, Spotify, MIT, and high-growth startups
• Large Series A investment already secured + up to 9 million in ARR

Ideal profile

– Computer science background

– Strong, demonstrable signal of impact in previous roles

– Experience taking companies from Series A through to Series C

– A track record of fixing hard systems problems that unlocked scale

– Have real hands-on Python experience

If this sounds like a fit, please get in touch.

Principal Engineer - Series A Scale Up - Up to £270,000

Extra information

Status

Open

Education Level

Secondary School

Location

City of London

Type of Contract

Full-time jobs

Published at

22-04-2026

Full UK/EU driving license preferred

No

Car Preferred

No

Must be eligible to work in the EU

No

Cover Letter Required

No

Languages

English