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.
Key Responsibilities
* 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
Skills & Experience
* 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.
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