Security Lead - Member of Technical Staff
On-siteLondon, England, United Kingdom
Job Summary
Define security architecture and requirements across APIs, orchestration stacks, agentic systems, and physical infrastructure. Translate complex security requirements into specific engineering work, measurable guarantees, and verifiable evidence. Lead security assurance for sensitive deployments from initial requirements through technical review and approval. Build and lead the security team across architecture, threat modelling, adversarial evaluation, incident response, and operations. Own how security is designed and assured across Callosum's heterogeneous compute landscape, ensuring guarantees are demonstrated in practice for customers ranging from shared cloud to sovereign, on-premise environments.
Required Qualifications
- Experience personally owning a demanding security assurance or sensitive deployment process end-to-end
- Strong technical foundations in infrastructure or security engineering, with the depth to challenge architectural decisions
- Experience securing sovereign, on-premise, air-gapped, multi-tenant, or other high-assurance environments
- Experience building and leading security teams, with strong judgement around risk, prioritisation, and engineering trade-offs
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