Senior Cyber Security Engineer

Frontier Resourcing; West of England; On-site; GBP 70,000 - 110,000; Full time

Job summary

Frontier Resourcing LTD is seeking a Senior Cyber Security Engineer to join a defence client in a hands-on role combining security engineering, threat detection and incident response. This position suits a technically strong professional with experience across offensive and defensive security in hybrid environments.

The role involves monitoring EDR/XDR, DLP and conditional access, conducting security checks, supporting remediation with infrastructure teams, and contributing to Microsoft-centric

Qualifications

• Experience across security engineering, threat detection and incident response.
• Experience with EDR/XDR, DLP and conditional access.
• Experience in hybrid on-premises and cloud environments.
• Familiarity with Microsoft Sentinel capabilities and purple‑team exercises.

Responsibilities

• Monitor security alerts across EDR/XDR, DLP and conditional access.
• Review vulnerability scans and manage security tickets.
• Support remediation with infrastructure teams.
• Contribute to Microsoft-centric security projects and governance.
• Assist with email security, privileged access management and password hygiene.
• Represent security requirements in IT change boards.
• Respond to threats across on-prem and cloud environments.
• Ensure controls align with regulatory standards.
• Engage in red/blue/purple team activities.
• Maintain security logs and reporting.

Skills

EDR/XDR

Threat detection

Incident response

Offensive security

Defensive security

Purple teaming

Vulnerability management

Microsoft Sentinel

Cloud security

Hybrid environments

OT awareness

Tools

Microsoft Sentinel

Conditional Access

DLP policies

Job description

Senior Cyber Security Engineer

We are seeking an experienced Senior Cyber Security Engineer to support a defence client in a hands on role combining security engineering, threat detection and incident response.

This opportunity would suit a technically strong cyber security professional with experience across both offensive and defensive security, capable of operating independently while working closely with infrastructure and wider IT teams to strengthen security across hybrid environments.

Key Responsibilities

• Monitor and manage security alerts across endpoint detection and response (EDR/XDR), Data Loss Prevention (DLP) and conditional access.
• Conduct daily security checks, review vulnerability scans, manage tickets and maintain accurate security logs.
• Support vulnerability remediation activities, working alongside infrastructure engineers to address identified risks.
• Contribute to Microsoft-centric security projects and help improve the organisation’s security posture.
• Support email security, privileged access management, password management and Microsoft Sentinel capabilities.
• Participate in IT change management processes, including representing security requirements at change boards.
• Identify, investigate and respond to potential threats and incidents across on-premises and cloud environments.
• Ensure security controls align with relevant regulatory, compliance and governance standards.
• Strong experience across both red and blue team activities, with a practical understanding of purple teaming.
• Experience with vulnerability management, remediation and current cyber security threats.
• Hands-on knowledge of EDR/XDR, email security and Data Loss Prevention.
• Familiarity with Microsoft-based environments, including Microsoft Sentinel and conditional access.
• Understanding of privileged access management and password management solutions.Experience working across hybrid on-premises and cloud environments.
• Awareness of IT change management processes and security-related regulatory and compliance standards.
• Excellent communication skills, with the ability to work independently and collaborate effectively with technical stakeholders.
• Exposure to Operational Technology (OT) environments.
• Networking expertise, particularly next-generation firewalls.

If you have hands on technical expertise and practical security mindset required for this role, we would welcome a conversation.