Callosum
Security Lead - Member of Technical Staff
London. Posted 2 months ago
The role
You will own how security is designed and assured across APIs, orchestration software, agentic systems, and physical compute infrastructure. You will set security architecture, translate requirements for engineering teams, and lead security engagements and teams.
What you will do
- Define security architecture and requirements across 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, incident response, and operations
Required qualifications
- Experience personally owning a demanding security assurance or sensitive deployment process end-to-end
- Strong technical foundations in infrastructure or security engineering
- Experience securing sovereign, on-premise, air-gapped, multi-tenant, or other high-assurance environments
- Experience building and leading security teams
Nice to have
- Strong judgement around risk, prioritisation, and engineering trade-offs
Benefits
- Competitive Salary
- Equity & Ownership
- Private healthcare
- Visa sponsorship
- Relocation benefits
Before you apply
- We offer Visa sponsorship and relocation benefits to hire the best in the world
About the company
Callosum is the Intelligent Systems Company building infrastructure that unifies heterogeneous compute across the full stack. They are engineers and scientists based in London.