Security Architect & Lead, Infrastructure & Orchestration

Callosum Technologies Ltd.; Greater London; Hybrid; GBP 110,000 - 170,000; Full time

Benefits offered by this job

Visa sponsorship

Relocation benefits

Private healthcare

London office on-site

Job summary

Callosum Technologies Ltd. in London seeks an experienced Security Architect to own the security design across APIs, orchestration, agentic systems, and compute infrastructure.

You will translate requirements into concrete technical expectations and lead engagements with customers, partners, and reviewers. You will build and lead Callosum's security team, drive threat modelling, incident response, and secure coding practices, while ensuring compliance with high-assurance environments and

Qualifications

• Experience owning a demanding security assurance or sensitive deployment process end-to-end.
• Strong technical foundations in infrastructure or security engineering.
• Experience securing high-assurance environments (on-premise, air-gapped, sovereign).

Responsibilities

• Define security architecture and requirements across API, orchestration, and infrastructure.
• Translate requirements into engineering work with measurable guarantees and evidence.
• Lead security engagements with customers and partners, building the security team.

Skills

Security architecture

Threat modelling

Incident response

Security leadership

Tools

Security tools

Job description

Callosum Technologies Ltd. in London seeks an experienced Security Architect to own the security design across APIs, orchestration, agentic systems, and compute infrastructure.

You will translate requirements into concrete technical expectations and lead engagements with customers, partners, and reviewers. You will build and lead Callosum's security team, drive threat modelling, incident response, and secure coding practices, while ensuring compliance with high-assurance environments and