Senior Product Engineer

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, Type Script, and React Computer Science background

Experience with in 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.