Senior AI Software Engineer

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London / £120000 - £140000 annum

INFO

Salary

SALARY:

£120000 - £140000

Location

LOCATION

London

Job Type
JOB TYPE

Permanent

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.

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

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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