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Senior Product Engineer (Python/Go/TypeScript)

owen thomas | b corp™ • United Kingdom
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AI Summary

Build and scale production-grade backend and agentic AI systems for a revenue-generating B2C start-up. Design backend services, APIs, data pipelines, and AI agent workflows from idea to production. Requires 3+ years of commercial software engineering experience, strong backend fundamentals, and production LLM/agentic AI experience.

Key Highlights
Production agentic AI and backend engineering role at a Series A B2C start-up
£100,000–£250,000 base salary plus meaningful equity
Visa sponsorship and relocation support available
London-based team working predominantly in person
3+ years commercial software engineering experience required

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Key Responsibilities
Designing, building and scaling backend services
Developing production-grade AI applications, agent workflows and LLM integrations
Building and improving APIs, asynchronous processing systems and data pipelines
Working on agent orchestration, retrieval systems and AI infrastructure
Improving reliability, performance and scalability across cloud-native systems
Taking ownership of features from initial design through to production
Collaborating closely with engineers, product teams and other stakeholders
Technical Skills Required
Python Go TypeScript

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Benefits & Perks
£100,000–£250,000 base salary + meaningful equity
Visa sponsorship and relocation support available
Comprehensive benefits and professional development support
Clear progression opportunities as the engineering team expands

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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 08, 2026
Employment Full-time
Experience Mid-Senior level
Location United Kingdom
Category Programming
Company owen thomas | b corp™
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