Description
Callosum is hiring a Security Architect to define and assure security across its APIs, orchestration software, agentic systems, and physical infrastructure. The role translates customer and deployment requirements into engineering work and measurable guarantees, leads security assurance for sensitive deployments, and builds and manages a security team covering architecture, threat modelling, adversarial evaluation, incident response, and operations. The position requires end-to-end security assurance experience, strong infrastructure or security engineering foundations, experience with high-assurance environments, and experience leading security teams. It offers competitive salary, equity, private healthcare, visa sponsorship, and relocation benefits, with work performed in person at the London office.
