Senior Software Engineer, Applied AI (United Kingdom)

The role

You will join a small cross-functional team to build an agent platform that uses AI to automate operational workflows. The role involves designing core components, building capabilities layers, and architecting knowledge infrastructure.

What you will do

• Design, build, and own core components of the agent platform
• Build and evolve the capabilities layer including APIs and service integrations
• Architect the knowledge and memory infrastructure
• Design and implement the trust and safety framework
• Contribute to agent evaluation and testing infrastructure
• Partner with Operations to identify automation opportunities
• Mentor other engineers on the team

Required qualifications

• 5+ years of backend engineering experience building and operating production systems
• Hands-on experience with LLMs and AI agents (orchestration, RAG, tool/function calling, or similar)
• Strong API design and system integration skills
• Product-minded: questions requirements and contributes to product decisions
• Proven ownership of complex projects in ambiguous, early-stage environments

Benefits

• Welcoming and casual environment
• Great benefits
• Wellness program offerings
• Company retreats

About the company

Justworks helps businesses get off the ground by enabling them to focus on running their business by solving HR issues. They are a data-driven company that works in a supportive, entrepreneurial environment.