Senior Software Engineer - Python

Senior Python Developer - London - AI Start-up

Location: London (Hybrid)

Compensation: Up to £150K

Atarus have partnered with a rapidly growing YC-backed AI start-up looking to hire a Senior Python Developer. This is an opportunity to join at the ground floor of a company that's already secured a strong seed round, launched with enterprise clients, and has ambitious growth plans over the next year.

You'll be joining a small, senior founding team who are redefining how AI-powered software is built - already gaining traction with customers ranging from Series A startups to global tech giants.

What You'll Be Doing

• Designing, building, and deploying high-performance Python applications
• Working directly with the founders on architecture, product, and scalability decisions
• Building robust APIs and backend systems that power real-world AI products
• Helping shape the engineering culture and technical direction of the company

️ Tech Stack

Python FastAPI AWS LangChain TypeScript Next.js

(You don't need to know every tool - they're looking for curious engineers who love to learn fast.)

Compensation & Equity

There are no preset limits on salary or equity. If you're top-tier, they'll match it.

What They're Looking For

• 5+ years' experience in Python development (or impressive personal projects)
• Strong experience with backend systems, APIs, and cloud infrastructure
• Solid understanding of software design and architecture principles
• A genuine builder mindset - someone who loves experimenting and delivering fast
• Based in London (or able to work onsite when needed)

If you're excited by the idea of joining an early-stage, YC-backed team with serious momentum - get in touch: