Senior Product Engineer

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London / £110000 - £140000 annum

INFO

Salary

SALARY:

£110000 - £140000

Location

LOCATION

London

Job Type
JOB TYPE

Permanent

Senior Product Engineer
London (Hybrid) | Up to £140,000 + Equity
Looking to make a genuine impact at an early-stage AI startup? This is an opportunity to join a well-funded business as one of its first engineering hires, taking ownership of a product already being tested by major enterprise customers.

The Company
This AI startup is building a behavioural intelligence platform that helps financial services organisations better understand customer behaviour and decision-making. Backed by significant early-stage investment, they are working with large enterprise clients and moving from proof-of-concept projects towards commercial deployment. With a small, highly capable team, they are focused on building scalable AI products with real-world impact.

The Role
You will take ownership of product development, helping to build and scale an AI-powered platform from an early stage.
Responsibilities include:
  • Building LLM-enabled products and features used by enterprise customers
  • Designing and developing backend services, APIs, and platform capabilities
  • Owning RAG workflows and AI application architecture
  • Managing evaluation frameworks, testing, monitoring, and quality standards
  • Optimising LLM performance, scalability, and cost efficiency
  • Working closely with product leadership and customers to shape the roadmap
  • Establishing engineering best practices across development and deployment
Your Skills & Experience
  • Strong experience as a Product Software Engineer
  • Proven track record building and shipping an LLM-based product from 0 to 1
  • Experience owning architecture, product decisions, and implementation
  • Strong backend engineering experience with API-first products
  • Hands-on experience with RAG and production AI systems
  • Understanding of token usage, model evaluation, and cost optimisation
  • Ability to operate autonomously in a startup environment
  • Strong communication and stakeholder management skills
Desirable:
  • Experience with Node.js, TypeScript, and React
  • Computer Science background
  • Experience within AI startups, technology companies, or financial services
What They Offer
  • Salary up to £140,000
  • Meaningful equity package
  • Hybrid working in London
  • Significant ownership and autonomy
  • Opportunity to shape the engineering culture and technical direction
  • Direct exposure to founders and business leadership
How to Apply
Apply today to learn more about this opportunity to build and scale cutting-edge AI products within a fast-growing startup.


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