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# Principal Platform Engineer

- **Company:** Leonardo
- **Location:** London, UK
- **Experience:** Experienced
- **Contract:** Permanent contract
- **Skills:** Microsoft Windows, Active Directory, Dynamic Host Configuration Protocol, Domain Name System (DNS), VMware ESX Servers, Monitoring of Systems, Hardware Security Module, Key Management, System Center Operations Management, Microsoft SQL Server, System Center Configuration Manager, Windows Servers, Performance Tuning, Public Key Infrastructure, Storage Virtualization, VCloud, VMware VSphere, System Availability, Information Technology, Vmware
- **Published:** May 22, 2026
- **Apply:** https://www.apply4u.co.uk/jobs/x/36999343/

## About the Role

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/##########5
Active Directory, Group Policy, DNS, DHCP
Exchange Serve#####19, SQL Server, SharePoi#####019

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

## Description

Leonardo is looking for a 3rd Line Platform 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.
This role is based full-time on site in London and requires DV clearance.
What you will do as a Principal Platform Engineer

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.


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