Security Architect & Lead, Infrastructure & Orchestration

Callosum Technologies Ltd. in London seeks an experienced Security Architect to own the security design across APIs, orchestration, agentic systems, and compute infrastructure.

You will translate requirements into concrete technical expectations and lead engagements with customers, partners, and reviewers. You will build and lead Callosum's security team, drive threat modelling, incident response, and secure coding practices, while ensuring compliance with high-assurance environments and