Callosum, the Intelligent Systems Company, headquartered in London, is seeking a Security Architect to own security across APIs, orchestration, agentic systems and physical infrastructure. You will define security architecture, translate requirements into engineering work, and lead assurance for high‑stakes deployments.
We offer equity, private healthcare, visa sponsorship and relocation support, and you’ll work in person at our London office with a team tackling frontier AI infrastructure and
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