Security Architecture Lead – AI Infrastructure

Callosum, London-based AI infrastructure company, seeks a security leader to design and guarantee security across APIs, orchestration, agentic systems, and physical infrastructure. You will translate requirements for engineering teams, drive assurance for deployments, and build a dedicated security function.

You will own security strategy, oversee threat modelling and incident response, and lead a team across architecture and operations, partnering with customers and partners in high-stakes

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