AI Software Engineer

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 findings

Develop sandboxed cyber-lab and range infrastructure using containers and Kubernetes

Deliver AI features from initial design through to production, including evaluations, guardrails and monitoring

Improve agent performance through prompt engineering, tool orchestration, evaluation and token and cost optimisation

Integrate security tools and enable agents to operate safely within defined scopes

Work closely with security researchers to translate offensive security techniques into effective agent behaviours

Lead code reviews and technical design sessions while supporting the development of other engineers

Contribute to reliable, scalable production systems across a polyglot technology environment

Job Requirements:

Significant software engineering experience, with a proven ability to build and scale production systems

Strong Python development skills and willingness to work with or learn Go

Hands-on experience building and operating production AI applications using large language models and agentic frameworks

Understanding of RAG, MCP, LangGraph or similar technologies, including tool integration and prompt design

Experience creating reliable AI agents through evaluation, guardrails and token and cost optimisation

Proficiency with Docker, Kubernetes and isolated sandbox environments, with cloud experience; GCP is advantageous

Knowledge of microservices, gRPC, API design, asynchronous messaging and platforms such as Pub/Sub or Kafka

Strong testing, communication and collaboration skills, alongside a genuine interest in understanding how systems are compromised

Desirable Experience:

Experience in offensive security, penetration testing, red teaming, capture-the-flag competitions or security tooling

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