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Network Engineer (L3/L4)

Thorn SDS -
Corsham

Apply Now

Job details

Permanent | Full-time

Benefits

Annual leave
Company pension
Life insurance
Referral programme

Qualifications

LAN
Network infrastructure
Firewall
Analysis skills
ITIL
IT
VMWare
Network engineering
Communication skills
VPN

Full job description

Are you a skilled Network Engineer looking to support a nationally significant UK Defence programme? This is a unique opportunity to join a high-impact programme delivering next-generation deployable IT services to support operations both in the UK and overseas.

About the Programme

The programme is transforming the MOD’s deployable IT capability across Land and Maritime domains. It is replacing legacy CIS services with a modern, secure, and resilient in-house solution designed to meet the demands of frontline operations.

A core element of this transformation is the delivery of robust Through Life Support (TLS) services—ensuring systems remain operational, secure, and fully supported in dynamic and often challenging environments.

The Role

As a Level 3 or 4 Network Engineer, you will provide advanced technical support and operational management for all network infrastructure components. You will work closely with Service Desk, Resolver Groups, and Level 4 engineers to maintain secure, reliable, and high-performance networks.

You will:

Provide Level 3 support for network infrastructure, including LAN, WAN, and deployed operational networks
Troubleshoot and resolve incidents across Layer 3 (network connectivity, routing, switching) and Layer 4 (applications and services running on the network)
Manage, configure, and maintain network devices such as switches, routers, firewalls, and VPNs
Support network monitoring, performance tuning, and capacity planning
Implement network changes, upgrades, and patching in line with ITIL processes and programme policies
Collaborate with Level 4 engineers and cross-functional teams for escalated incidents or complex projects
Ensure network security and compliance with MOD policies and standards
Support operational deployments for both on-premises and deployed environments

What We’re Looking For

Proven experience at SFIA Level 3 in enterprise or operational network environments
Strong knowledge of:
- Layer 2/Layer 3 networking (routing, switching, VLANs)
- Firewalls, VPNs, and secure network connectivity
- Monitoring, performance tuning, and troubleshooting network infrastructure
- L4 application dependencies and their interaction with network performance
- Software Defined Networking, e.g. VMWare NSX
Experience in secure or regulated environments, ideally defence-related
Solid understanding of ITIL-aligned service management processes
Excellent problem-solving, analytical, and communication skills
Ability to work on-site at Corsham full-time

Important Note

Due to the nature of this work, candidates must be eligible for appropriate UK security clearance.

All applicants must hold the Right to Work in the UK and already possess, or be eligible to obtain, a high level of National Security Clearance.

Due to the nature of our business, your nationality, previous nationalities, and country of birth may influence the types of roles for which you are eligible.

Why Join?

Work on a mission-critical national defence programme
Maintain and optimise advanced network infrastructure supporting deployed operations
Opportunity to develop skills in highly secure, complex IT environments

25 days Annual Leave (plus Bank Holidays)
Employer Pension Contributions
Group Life Insurance
Dental & Health Cashback Plan
Wellbeing Services (includes GP, Physio and Savings Benefits)
Thorn Wellbeing Support Contribution
Employee Referral Scheme
Supported Training & Personal Development Opportunities

Apply

If you have the expertise to support this requirement and are eager to make an impact in a critical role, please apply today!

Job Details

Role: Network Engineer (L3/L4)

Location: Corsham

Employment: Full Time

Contract: Permanent

Apply Now

Refine Your Search

systems development / network infrastructure engineer vmware jobs

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Virtualization Engineer

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Principal Platform Engineer

Tier 1 IT Engineer

Senior Technical Support Engineer (Level 3)

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3rd Line Support Engineer

Senior IT Engineer

Senior IT Engineer - T3

Security Information Engineer

Senior System Administrator

Senior System Administrator

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