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Senior Product Engineer (Python / Go) - Production Agentic AI

owen thomas | b corp™ • United Kingdom
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Senior Product Engineer role building production-grade agentic AI systems at a Series A B2C start-up. Design, build and scale backend services in Python and Go, including AI infrastructure, APIs and data pipelines. Requires 3+ years commercial experience, strong Python/Go backend skills and hands-on production LLM/agentic AI experience.

Key Highlights
Senior Product Engineer role at a Series A B2C start-up
Build production-grade agentic AI systems with Python and Go
£100k–£200k base salary plus meaningful equity
Visa sponsorship and relocation support available
London-based, working predominantly in person
Key Responsibilities
Design, build and scale backend services using Python and Go
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 LLM
Benefits & Perks
Equity
Visa sponsorship
Relocation support
Professional development support
Comprehensive benefits
Nice to Have
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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