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

• 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

• Experience with Node.js, TypeScript, and React


• Computer Science background


• Experience within AI startups, technology companies, or financial services

• 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

Apply today to learn more about this opportunity to build and scale cutting-edge AI products within a fast-growing startup.

This listing is from Reed. View original listing ↗