Hybrid Cyber Security Architect & Engineering Lead (London)

Circle Recruitment; Greater London; Hybrid; GBP 70,000 - 80,000; Full time

Job summary

Circle Recruitment seeks a senior Cyber Security Architect & Engineering Lead in London, hybrid, to strengthen security architecture and hands-on engineering capability. You will own security architecture, engineering, operations and improvements, mentoring others and delivering secure controls.

The role emphasizes leadership, technical ownership, and influencing stakeholders to implement pragmatic security improvements across Microsoft 365, Azure and related tooling.

Qualifications

• Hands-on security engineering and architecture in a Microsoft-centric environment.
• Strong experience with Microsoft Sentinel: setup, configuration, tuning, detection and SecOps.
• Deep knowledge of Microsoft Defender, Entra ID, Azure, Microsoft 365 and related tooling.
• Experience with identity, Zero Trust, cloud, data, endpoint, network, application and API security; secure software development.
• Experience with security architecture reviews, threat modelling, control design and reference architectures.
• Strong ISO 27001 experience including controls, audits, remediation and continual improvement.
• Experience in incident response, detection engineering, threat hunting, vulnerability management and security automation.
• Ability to own initiatives from problem identification to business case, implementation and measurement.

Responsibilities

• Define and evolve security architecture across identity, endpoints, networks, cloud, SaaS, data, applications and integrations.
• Design, implement and improve security controls with emphasis on Zero Trust, secure-by-design and automation.
• Lead security architecture reviews and threat modelling for major projects and high-risk integrations.
• Own security initiatives from problem identification through to implementation and validation.
• Provide technical leadership across Microsoft Sentinel, Defender and wider SecOps, including configuration and monitoring.
• Provide oversight across incident response, threat hunting, vulnerability management and security recovery.
• Support complex incident response with internal teams, SOC providers and partners.
• Improve vulnerability management using business risk, exploitability and threat intelligence.
• Lead and support ISO 27001 controls, audits and continual improvement.
• Support Cyber Essentials Plus, client assurance and regulatory security requirements.
• Lead on AI security, including AI governance and practical controls for AI technologies.
• Identify opportunities to automate security and assurance processes.

Skills

Security engineering

Security architecture

Microsoft Sentinel

Microsoft Defender

Entra ID

Azure

Threat modelling

ISO 27001

Automation

Leadership

Mentoring

Python

PowerShell

Logic Apps

Azure Functions

APIs

Tools

Python

PowerShell

Logic Apps

Azure Functions

APIs

Job description

Circle Recruitment seeks a senior Cyber Security Architect & Engineering Lead in London, hybrid, to strengthen security architecture and hands-on engineering capability. You will own security architecture, engineering, operations and improvements, mentoring others and delivering secure controls.

The role emphasizes leadership, technical ownership, and influencing stakeholders to implement pragmatic security improvements across Microsoft 365, Azure and related tooling.