Senior/Principal Security Infrastructure Engineer

Senior/Principle Security Infrastructure Engineer
Permanent | £70,000 to £90,000 | Bristol (hybrid)

Our client is seeking a Senior/Principle Security Infrastructure Engineer to provide technical leadership and hands-on expertise in securing enterprise infrastructure and networks. This role focuses on resilience, compliance, and integrity across a complex multi-technology environment.

• Design, build and maintain secure on-premises and cloud network and system architectures

• Harden Microsoft Server/Desktop platforms, Active Directory, and Group Policies

• Deploy and manage MFA solutions (YubiKey, RSA) for enterprise identity and access protection

• Secure virtualisation platforms (Hyper-V, VMware) and implement endpoint security (EDR, anti-malware, DLP)

• Operate and optimise SIEM tools (Splunk, Microsoft Sentinel) for threat detection and incident response

• Perform vulnerability assessments using Qualys and Tenable, driving remediation and continuous improvement

• Align security controls with ISO 27001, NIST, CIS, and Cyber Essentials, supporting audits and compliance

• Proven experience in infrastructure or network security within enterprise environments

• Strong knowledge of Microsoft technologies (Windows Server/Desktop, Active Directory, Group Policy)

• Hands-on experience with MFA, virtualisation, and network security appliances

• Understanding of SIEM operations, vulnerability management, and endpoint protection

• Familiarity with recognised security frameworks (ISO 27001, NIST, CIS, Cyber Essentials)

• Excellent problem-solving and communication skills

• DV cleared.

A key opportunity to lead technical security initiatives, embed best-practice controls, and work on strategic infrastructure projects with flexible working and career development opportunities.