Verified Job
IT / Software / Data Analyst
Network Engineer (L3/L4)
IT / Software / Data Analyst
#737825
Remote / WFH
Thorn SDS
Job Description
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.
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.
