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Senior Security Architect

United Kingdom
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AI Summary

Lead security architecture and assurance across Callosum's heterogeneous AI infrastructure, defining requirements for APIs, orchestration stacks, agentic systems, and physical compute environments. Translate complex security needs into verifiable engineering guarantees and manage end-to-end security engagements with customers and partners. Build and lead a cross-functional security team responsible for architecture, threat modeling, adversarial evaluation, incident response, and operations.

Key Highlights
Own security architecture across full stack including APIs, orchestration, agentic systems, and physical infrastructure
Translate customer requirements into measurable engineering guarantees and verifiable evidence
Lead security team covering architecture, threat modeling, adversarial evaluation, incident response, and operations

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Key Responsibilities
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 modeling, adversarial evaluation, incident response, and operations

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Technical Skills Required
Security Architecture Threat Modeling Incident Response

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Benefits & Perks
Competitive Salary
Equity & Ownership
Private healthcare

Job Description

We’re living through a Cambrian explosion of intelligence: new models and new chips, each specialised for different tasks, are arriving all at once. The result is a new era for AI, one of radical heterogeneity.Callosum is the Intelligent Systems Company. We believe the next generation of AI won't be defined by any single model or chip, but by intelligent systems in which hardware and intelligence co-evolve. We are building the infrastructure that unifies heterogeneous compute across the full stack. This opens a new axis of scaling intelligence: a dynamic system that tailors itself to what each workload actually needs, whether that's speed, cost, precision, or whatever unit comes next.
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Job Overview
Posted Aug 20, 2026
Employment Full-time
Experience Not Applicable
Location United Kingdom
Category Cyber Security
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