Infrastructure and Active Directory 3rd Line Engineers

CBSbutler Holdings Limited trading as CBSbutler; Basingstoke; On-site; GBP 110,000 - 120,000; Full time

Job summary

CBSbutler Holdings Limited trading as CBSbutler is seeking an experienced Infrastructure & Active Directory Engineer to join a secure, business-critical IT environment near Basingstoke. The role is onsite and focuses on Windows and Linux servers, virtualisation, storage, backup, monitoring and AD management.

You will provide hands-on third-line engineering, support critical services, and contribute to modernisation and lifecycle projects, with DV clearance essential for eligibility.

Qualifications

• Must have third-line infrastructure or Active Directory engineering experience.
• Strong expertise in either infrastructure or Active Directory.
• Windows Server 2016 onwards admin experience.
• VMware vSphere and/or Hyper‑V experience.
• Active Directory, Group Policy, DNS and DHCP management.
• DV security clearance is essential and must be current.

Responsibilities

• Provide third-line support and resolve complex infrastructure and Active Directory issues.
• Administer Microsoft Active Directory, Group Policy, DNS, DHCP and replication.
• Support Windows Server 2016 onwards and Red Hat Enterprise Linux.
• Manage VMware vSphere and/or Hyper‑V environments.
• Support SAN/NAS storage, backup, monitoring, clustering and disaster recovery.
• Undertake server builds, patching, upgrades and vulnerability remediation.
• Support infrastructure modernisation and migration projects.
• Perform root cause analysis and manage technical incidents and changes.
• Maintain technical documentation and follow ITIL processes.
• Collaborate with network, security, desktop and application teams.

Skills

Infrastructure engineering

Active Directory engineering

Windows Server administration

Linux administration

Tools

VMware vSphere

Hyper-V

SAN/NAS storage

Backup solutions

DNS/DHCP management

SCCM/WSUS/SCOM

Job description

Infrastructure & Active Directory Engineer

Location: Onsite near Basingstoke

Clearance: Active DV Required

Contract: 6 months

Rate: £80 to £87 per hour

IR35: Inside IR35

4 roles available

The Role

We are seeking an experienced Infrastructure & Active Directory Engineer to join a secure, business-critical IT environment.

This is a hands-on third-line engineering role covering Windows and Linux servers, virtualisation, storage, backup, monitoring and Microsoft Active Directory.

You will provide technical support across an established enterprise infrastructure while contributing to modernisation, upgrades and technology lifecycle projects.

Candidates should have strong experience in either infrastructure engineering or Active Directory, with good working knowledge of the other.

Key Responsibilities

• Provide third-line support and resolve complex infrastructure and Active Directory issues.
• Administer Microsoft Active Directory, Group Policy, DNS, DHCP, replication and authentication.
• Support Windows Server 2016 onwards and Red Hat Enterprise Linux.
• Manage VMware vSphere and/or Hyper‑V virtualisation environments.
• Support SAN/NAS storage, backup, monitoring, clustering and disaster recovery.
• Undertake server builds, patching, upgrades and vulnerability remediation.
• Support infrastructure modernisation and migration projects.
• Perform root cause analysis and manage technical incidents and changes.
• Maintain technical documentation and follow ITIL service management processes.
• Work closely with network, security, desktop and application teams.

Essential Skills & Experience

• Proven third-line Infrastructure or Active Directory engineering experience.
• Strong expertise in either infrastructure or Active Directory.
• Windows Server 2016 onwards administration.
• VMware vSphere (ESXi/vCenter) and/or Hyper‑V.
• Active Directory, Group Policy, DNS and DHCP.
• Experience with SAN/NAS, enterprise backup and disaster recovery.
• Working knowledge of RHEL/Linux administration.
• Familiarity with SCCM, WSUS and SCOM.
• Good understanding of networking fundamentals (TCP/IP, DNS, firewalls and routing).
• Strong troubleshooting and root cause analysis skills.
• Experience working within secure, controlled IT environments.
• Current, valid DV security clearance is essential. Candidates without DV clearance cannot be considered.

Desirable Skills

• Advanced VMware, Hyper‑V or Azure Local experience.
• RHEL hardening and RedHat Satellite.
• Windows PKI, Entra ID, AD Connect or ADFS.
• Active Directory migrations and server upgrades.
• PowerShell, Python or Ansible automation.
• CIS/NCSC security baselines and air-gapped environments.
• Relevant Microsoft, VMware, RedHat or ITIL certifications.

This is an excellent opportunity for an experienced Infrastructure or Active Directory Engineer to work within a secure enterprise environment, supporting critical services and delivering infrastructure modernisation