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Senior Product Engineer

owen thomas | b corp™ • United Kingdom
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AI Summary

Join a well-funded Series A B2C start-up as a Senior Product Engineer, building production-grade Agentic AI systems and scalable backend services. You will take end-to-end ownership of features, from architectural decisions through to production deployment. Strong backend engineering experience with Python or Go, LLM-powered application development, and solid fundamentals in APIs, SQL, and system design are required.

Key Highlights
£100k–£250k + Equity with comprehensive benefits
Build production-grade Agentic AI and LLM-powered applications
Take full technical ownership from design through to production
Early-stage Series A startup with rapid growth and career progression
Visa sponsorship and relocation support available

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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
Backend Engineering APIs System Design

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Benefits & Perks
Equity package
Comprehensive benefits
Professional development support
Visa sponsorship
Relocation support

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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 a 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 15, 2026
Employment Full-time
Experience Mid-Senior level
Location United Kingdom
Category Programming
Company owen thomas | b corp™
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