deployment requirements into concrete technical expectations for engineering teams, and ensure that the guarantees we make can be demonstrated in practice. You will lead security engagements across customers, infrastructure partners, and external technical reviewers, while building and managing the team responsible for security across Callosum. What You'll Do Define … requirements across our API, orchestration stack, 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 ...