Our client, a leading technology business specialising in cybersecurity and penetration testing, is seeking an AI Software Engineer to join its permanent, fully remote team in the UK. This senior-level role focuses on building intelligent AI agents that can plan, reason, operate security tooling and identify exploitable vulnerabilities within controlled environments.Key Responsibilities:Design, build and deploy AI agents that automate penetration testing, including planning, tool use and reasoning over security findingsDevelop sandboxed cyber-lab and range infrastructure using containers and KubernetesDeliver AI features from initial design through to production, including evaluations, guardrails and monitoringImprove agent performance through prompt engineering, tool orchestration, evaluation and token and cost optimisationIntegrate security tools and enable agents to operate safely within defined scopesWork closely with security researchers to translate offensive security techniques into effective agent behavioursLead code reviews and technical design sessions while supporting the development of other engineersContribute to reliable, scalable production systems across a polyglot technology environmentJob Requirements:Significant software engineering experience, with a proven ability to build and scale production systemsStrong Python development skills and willingness to work with or learn GoHands-on experience building and operating production AI applications using large ..... full job details .....