2nd/3rd Line Infrastructure Engineer

Company: CBSbutler Holdings Limited trading as CBSbutler
Apply for the 2nd/3rd Line Infrastructure Engineer
Location: London
Job Description:

Salary: £60,000 – 70,000 per year

Requirements

  • Active Developed Vetting (DV) clearance that is current and transferable
  • Proven experience in a 2nd/3rd line infrastructure support or engineering role
  • Strong Wintel infrastructure support experience within enterprise environments
  • In-depth knowledge of Windows Server (2016/2019/2022)
  • In-depth knowledge of Active Directory, Group Policy, DNS, and DHCP
  • In-depth knowledge of VMware vSphere / ESXi
  • Excellent troubleshooting and diagnostic skills across core infrastructure technologies
  • Experience working within secure, enterprise, government, or defence environments
  • Ability to work full-time onsite in London
  • PowerShell scripting and automation experience is desirable
  • Experience with backup and recovery solutions is desirable
  • Knowledge of infrastructure monitoring tools such as SCOM or equivalent is desirable
  • Exposure to highly secure, classified, or air-gapped environments is desirable
  • Experience supporting mission-critical systems and services is desirable

Responsibilities

  • Provide 2nd and 3rd line support for Windows-based infrastructure and core services
  • Administer and support Active Directory environments, including Group Policy, DNS, DHCP, and user/device management
  • Support and maintain VMware virtualised infrastructure environments
  • Investigate, troubleshoot, and resolve complex infrastructure incidents and problems
  • Perform system patching, upgrades, maintenance, and lifecycle management activities
  • Implement and maintain security best practices within a highly regulated environment
  • Create and maintain technical documentation, support procedures, and operational runbooks
  • Work closely with infrastructure, network, and security teams to support business-critical services
  • Contribute to continuous improvement initiatives and infrastructure optimisation projects
  • Participate in technical escalations and provide support for major incidents when required

Technologies

  • Active Directory
  • Support
  • Network
  • PowerShell
  • Security
  • VMware
  • Windows
  • DevOps

More

We are seeking an experienced DV Cleared 2nd/3rd Line Infrastructure Engineer to join our highly secure and mission-critical environment based in London. This is a full-time, 100% onsite role supporting enterprise Wintel infrastructure within a complex, high-security setting. We offer a competitive salary of £60,000 – £70,000 plus bonus, along with the opportunity to work on nationally important systems in a collaborative and technically challenging environment.

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Posted: July 10th, 2026