Harnham
Senior AI Software / Product Engineer
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Senior AI Software Engineer
London (Hybrid, 3 days per week)
Up to £140,000 + Equity
We're partnered with a fast-growing AI start-up building cutting-edge behavioural intelligence technology for the financial services sector. Backed by an exceptional leadership team and industry experts, they're developing a platform that helps organisations better understand client behaviour through advanced AI and large language models.
As their first senior individual contributor engineering hire, you'll play a critical role in shaping both the product and engineering culture from the ground up.
The Opportunity
This is a true 0-to-1 product engineering role. You'll work closely with senior leadership to build and scale a greenfield product, taking ownership across the full stack while driving the architecture and evolution of production-grade AI systems.
You'll have significant influence over technical direction, engineering standards, product decisions and future hiring as the team grows.
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What You'll Be Doing
- Building and shipping customer-facing product features end-to-end
- Developing and scaling production LLM applications
- Owning RAG pipelines and AI application architecture
- Implementing guardrails, evaluations, caching and model routing strategies
- Working across TypeScript, React, Node.js, PostgreSQL and AWS (Open to different technology backgrounds!)
- Building API-first services for enterprise customers
- Establishing engineering best practices around testing, deployment and code quality
- Collaborating directly with product and leadership stakeholders to influence roadmap and delivery priorities
What We're Looking For
- Experience building and scaling production LLM-powered applications
- Strong full-stack engineering background
- Experience delivering secure, reliable and scalable systems
- Comfortable working across multiple technologies and learning new stacks quickly
- Experience with React and modern web applications
- Product-minded approach with the ability to operate autonomously
- Passion for building in an early-stage, high-growth environment
- Experience within regulated industries or financial services is beneficial but not essential
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Why Join?
- Up to £140,000 base salary
- Meaningful equity package
- Opportunity to become the first senior engineering hire
- Direct impact on architecture, product and company direction
- Work alongside talent from leading technology and AI organisations
- Greenfield product with genuine product ownership
- Hybrid working in Central London
- 25 days holiday plus additional benefit
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