Senior AI Engineer - Agent Platform & Systems

Justworks UK is seeking a Senior Software Engineer to join a small, autonomous team building an AI-native agent platform that reads operational knowledge and executes tasks end-to-end. You will own large segments of the technology stack and ship production-ready systems.

You will mentor other engineers and balance pragmatism with quality, driving initiatives in a fast-paced, early-stage environment. This is a product-focused role with strong backend foundations and AI/LLM emphasis.