3rd Line Wintel Infrastructure Engineer

Limelight Health; Greater London; On-site; GBP 50,000 - 70,000; Full time

Job summary

A leading defence technology company in the UK is seeking a 3rd Line Wintel Infrastructure Engineer. In this role, you will serve as a Subject Matter Expert in Windows-based infrastructures, supporting a critical MOD site. Your responsibilities will include troubleshooting complex technical issues, deploying secure Windows Server environments, and ensuring compliance with security measures. Strong expertise in high-security systems and detailed technical documentation is required. Join a skilled team to optimize system performance and deliver reliable IT services.

Qualifications

• Expertise in troubleshooting complex technical issues.
• Experience in deploying Windows Server environments.
• Ability to create and maintain detailed technical documentation.

Responsibilities

• Lead resolution of complex technical issues.
• Ensure optimal system performance and high availability.
• Participate in IT projects to meet compliance and business objectives.

Skills

Proficiency in Ivanti Application & Device Control

Experience with high-security MOD systems

Familiarity with security documentation

Tools

Windows Server 2019/2022/2025

Active Directory

VMware Cloud Foundation

Microsoft Endpoint Configuration Manager (MECM)

Microsoft System Centre Operations Manager (SCOM)

Job description

Leonardo is looking for a 3rd Line Wintel Infrastructure Engineer to join our collaborative and skilled team supporting a critical MOD site. This is an exciting opportunity to serve as a Subject Matter Expert (SME) in Windows-based enterprise infrastructures. You'll play a central role in the design, deployment, and support of high-security systems that underpin key defence and aerospace operations.

Your Impact

• Take ownership of complex technical issues through to resolution, collaborating with users and other IT teams.
• Provide expert-level troubleshooting for incidents escalated from 1st and 2nd line support, ensuring consistent and minimal disruption to services.
• Deploy and integrate secure Windows Server environments (Active Directory, Group Policy, DNS, DHCP) using industry best practices.
• Implement and maintain infrastructure security measures such as patching, access controls, and hardening to align with compliance and internal governance.
• Use monitoring tools to proactively optimize system performance and ensure high availability.
• Create and maintain detailed technical documentation and contribute to internal knowledge sharing and mentoring.
• Participate in IT projects, ensuring infrastructure design meets both technical and business objectives.
• Collaborate closely with network, security, and application teams to deliver reliable, secure IT services.

What you’ll bring

• Proficiency in Ivanti Application & Device Control or similar lockdown tools.
• Experience working with high-security MOD systems and secure design principles.
• Familiarity with security and compliance documentation (e.g. RMADS, SyOPs, NIST frameworks).

Core Technologies

Microsoft:

• Windows Server 2019/2022/2025
• Active Directory, Group Policy, DNS, DHCP
• Exchange Server 2019, SQL Server, SharePoint 2019

VMware:

• VMware Cloud Foundation
• vSphere, ESXi, NSXT, and vSAN

Endpoint & Configuration:

• Windows 10 & 11
• Microsoft Endpoint Configuration Manager (MECM)

Monitoring & Observability:

• Microsoft System Centre Operations Manager (SCOM)

PKI Technologies:

• Microsoft Certificate Services, Hardware Security Modules (HSMs), and lifecycle key management

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