Senior & Lead Product Engineers - Python focused | Django, FastAPI, AWS, JavaScript | Building Human Intelligence > AI Infra | Research + Healthcare | Remote (UK) | £80-130k base, Bonus + Equity

The Company - AI systems are only as reliable as the data and feedback loops behind them.

We’re partnering with a profitable, globally-used technology company building infrastructure that helps global organisations develop more reliable, trustworthy AI systems. Their platform supports teams working across research, healthcare, and enterprise environments - where accuracy, integrity, and real-world performance genuinely matter.

The business has been operating successfully for over a decade and is now scaling rapidly due to accelerating demand in AI. With strong product-market fit and significant growth ahead, they’re investing heavily in senior engineering talent to shape the next phase of the platform.

You’ll join a senior, product-focused engineering team working in small high performance teams building high-scale backend systems that sit at the core of the company’s platform.

This is a backend-first role (Python ≈70%) with meaningful influence across system design, architecture, and product direction.

You’ll operate with real ownership - balancing delivery speed, scalability, and long-term maintainability - while contributing to a platform that underpins critical AI-driven applications globally.

• Designing and owning backend services in Python (Django / FastAPI)
• Building scalable APIs and workflows supporting global usage
• Improving reliability, performance, and developer experience
• Working closely with Product and Design to shape features end-to-end
• Contributing across the stack when useful (TypeScript exposure)
• Helping evolve engineering standards as the team scales

This is a pragmatic, fast-moving Product Engineering centric environment - but with a strong emphasis on thoughtful engineering.

• FastAPI (in parts)
• TypeScript / Vue.js
• AWS
• Modern CI/CD practices
• 4–6+ years of professional software engineering experience
• Strong production-grade Python
• Experience building scalable backend systems
• Comfort operating with ambiguity and ownership
• Product mindset - thinking beyond implementation
• Clear communicator, collaborative by nature
• Experience in startup or scale-up environments preferred

Exposure to AI systems, research platforms, or data-intensive products is a bonus — not required.

• 60-minute collaborative Python pairing session
• Final conversation with senior leadership

Structured, respectful, and focused on real-world thinking.

• Globally used platform with strong product-market fit
• Direct impact on how modern AI-enabled systems perform in the real world
• Senior hiring bar - high quality, low ego
• Fully remote within the UK, with a London office
• Engineering team scaling from ~60 → 100+
• Strong benefits package

If you’re a senior Python engineer who enjoys building robust, high-scale systems and wants your work to contribute to more reliable, real-world AI applications - this is a genuinely meaningful opportunity.

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