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Senior Product Engineer (Python / Go / TypeScript)

owen thomas | b corp™ • United Kingdom
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AI Summary

Senior Product Engineer role at a well-funded B2C AI startup in London, building production-grade agentic AI systems with backend ownership. Designs, builds and scales backend services while developing AI infrastructure including agent workflows, LLM integrations and retrieval systems. Requires 3+ years commercial experience with strong Python or Go, proven deployment of LLM-powered applications into production, and product-minded engineering approach.

Key Highlights
£100k–£250k + Equity, visa sponsorship and relocation support
Build production-grade agentic AI, agent workflows and LLM integrations — not experiments
Deep technical ownership: architect decisions, end-to-end feature delivery
Join a small ambitious team with clear progression to Staff/Principal/Leadership
London-based, predominantly in-person (5 days)

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Key Responsibilities
Design, build and scale backend services
Develop production-grade AI applications, agent workflows and LLM integrations
Build and improve APIs, asynchronous processing systems and data pipelines
Work on agent orchestration, retrieval systems and AI infrastructure
Improve reliability, performance and scalability across cloud-native systems
Take ownership of features from initial design through to production
Collaborate closely with engineers, product teams and other stakeholders
Technical Skills Required
Python Go System Design

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Benefits & Perks
£100,000–£250,000 base salary + meaningful equity
Visa sponsorship and relocation support
Comprehensive benefits and professional development support
Clear career progression to Staff, Principal or Engineering Leadership

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Nice to Have
Go
Django
GCP
Terraform
Celery
RAG
Multi-agent systems
LLM evaluation frameworks

Job Description

The Opportunity

We're working with a well-funded, high-growth technology start-up, with global presence, that's making a significant investment into its engineering team in London.

They're looking for exceptional Product Engineers with strong backend experience who want to work on technically challenging problems at the intersection of Software engineering, Product ownership and AI.

The business is already generating revenue, has an established product in production and is now entering an exciting period of growth.

This is an opportunity to join a small, ambitious engineering team, take genuine ownership of what you're building and have a direct impact on the direction of the product.

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Job Overview
Posted Nov 14, 2026
Employment Full-time
Experience Mid-Senior level
Location United Kingdom
Category Programming
Company owen thomas | b corp™
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