Senior 3rd Line Infrastructure Engineer

Leidos; Brampton; On-site; GBP 62,000 - 79,000; Full time

Benefits offered by this job

Contributory Pension Scheme

Private Medical Insurance

33 days Annual Leave (incl. public &'s

Access to Flexible benefits

Flexi-Time

Job summary

Leidos is seeking a Senior 3rd Line Engineer in Huntingdon, UK to diagnose and resolve complex incidents on critical IT systems. You will lead root cause analysis, drive CSI, and support Change Requests across virtualized, storage, and cloud-native platforms.

The role requires deep Windows/Linux expertise, strong networking, and experience with VMware/Hyper-V, NetApp/Nutanix, Veeam/Commvault, and Kubernetes/Docker. UK-based on-site work with a competitive package.

Qualifications

• Experience with large-scale enterprise IT environments.
• Strong knowledge of Windows Server, AD, DNS, DHCP and GPO.
• Ability to troubleshoot complex incidents and perform root cause analysis.

Responsibilities

• Respond to escalations from 2nd Line and Resolver Groups.
• Conduct proactive maintenance and periodic system upgrades.
• Document changes and maintain technical configurations.
• Assist in infrastructure deployment and CRs.

Skills

VMware

Hyper-V

Windows Server

DNS/DHCP

Troubleshooting

Networking

Kubernetes

Docker

Tools

VMware Horizon

Citrix

NetApp

Nutanix

Veeam

Commvault

SCCM

SCOM

Active Directory

Job description

Senior 3rd Line Engineer

Location: Huntingdon, UK

Clearance - High - DV 'Developed Vetting'

UNLEASH YOUR POTENTIAL

You will provide a crucial role in Core Services, conducting complex fault rectification of incidents, support Problem Management, Continual Service Improvement (CSI), and occasional Change Request (CR) work on IT Systems supporting key National Security outputs.

You will conduct reactive and proactive maintenance, primarily on the JUNO system, but may occasionally be required to support other systems that Leidos manage. These systems are highly utilised with many active users who operate at varying security levels.

3rd Line Engineers are responsible for responding to escalations from 2nd Line Engineers as well as other Resolver Groups and conduct advanced troubleshooting to diagnose and rectify issues as they arise.

3rd Line Engineers will be able to develop technical solutions to complex issues and problems as well as possess the ability to liaise with stakeholders at all levels of seniority, including the customer. Adherence to resolving issues and problems within SLA levels and ensuring KPI’s are met is also required.

• Have excellent knowledge of Virtualized Environments such as VMware and Hyper-V.
• Have excellent knowledge of VDI environments such as VMware Horizon or Citrix.
• Have excellent knowledge of HCI such as NetApp SolidFire or Nutanix.
• Have excellent knowledge of SAN storage technologies such as NetApp or Dell PowerStore.
• Have excellent knowledge of Backup & Recovery technologies such as Veeam or Commvault
• Have excellent knowledge of Windows Server Environments from Server 2008 – 2025 including AD, DNS, DHCP and GPO from design to implementation and support.
• Have demonstrable experience of supporting Enterprise IT hardware in datacentre environments.
• Have strong Linux system administration skills (Ubuntu / CentOS/RedHat).
• Have strong knowledge of TCP/IP and networking technologies including load balancing and firewalls.
• Have strong knowledge of software defined network such as VMWare NSX-T or HPE Aruba.
• Have good knowledge of Microsoft stack technologies such as SharePoint, Skype / Teams, MS SQL, MS System Centre, Office365, SCCM & SCOM, MS Exchange & CLI tooling .
• Have general knowledge of cloud-native application platforms and Kubernetes-based containerised applications.
• Have experience working on Production, Reference & Development systems & the configuration control lifecycle going from development through into production.
• Have experience MicroServices architecture platforms (Tanzu, Rancher), Kubernetes & Docker.
• Have knowledge of 2 Factor-Authentication technologies.
• Have knowledge/ experience with scripting.
• Have experience of producing and updating technical documentation to a high standard.
• Have excellent analysis and problem-solving skills.
• Possess excellent communication skills.
• Have ITIL3 or ITIL 4 at the Foundation level or above.

KEY DUTIES

• System Support & Ticket resolution - Utilising technical expertise to ensure Cat A systems are kept online and running smoothly and that Incidents are dealt with in a timely manner IAW with KPI/SLA.
• Problem Resolution- Work with other resolver groups, original manufacturers, Users and suppliers to perform root cause analysis, providing technical solutions to complex problems.
• Maintenance - Responsible for completing the and recording Periodic maintenance of the system Utilising Periodic Preventative Maintenance (PPM) and routine upgrading activities to stay ahead of obsolescence issues
• Documentation - Maintain and create documentation of system configuration changes. As well as accurately recording work in SD+
• Resource Movement - Assist in the configuration, installation, and deployment of infrastructure components, including virtual machines and UAD’s.
• Participation in Projects - Engage in infrastructure-related projects, CR’s contributing to implementation build, testing phases.

Key Competencies

• Communications - Verbal, written including technical documentation.
• Collaboration - Working with other SME’s, Users & Resolver groups to ensure efficiency.
• Adaptability and flexibility - Able to change focus under changing situations.
• Technical expertise - Ability to troubleshoot and fault rectification variety of issues.
• Attention to detail - Including written and work carried out.
• Customer service - excellence.
• Teamwork - Build effective internal and external relationships.
• Attention to detail - Including written and work carried out.
• Customer service - excellence.
• Teamwork - Build effective internal and external relationships.

• Contributory Pension Scheme
• Private Medical Insurance
• 33 days Annual Leave (including public and privilege holidays)
• Access to Flexible benefits (including life assurance, health schemes, gym memberships, annual buy and sell holidays and a cycle to work scheme)
• Flexi-TIme

Commitment to Diversity

We welcome applications from every part of the community and are committed to a truly diverse and inclusive culture. We foster a sense of belonging, welcoming all perspectives and contributions, and providing equal access to opportunities and resources for everyone. If you have a disability or need any reasonable adjustments during the application and selection stages please let us know, and we will respond in a way that best fits your needs.

If you're looking for comfort, keep scrolling. At Leidos, we outthink, outbuild, and outpace the status quo — because the mission demands it. We're not hiring followers. We're recruiting the ones who disrupt, provoke, and refuse to fail. Step 10 is ancient history. We're already at step 30 — and moving faster than anyone else dares.

£61,500.00-£78,800.00

Commitment to Non-Discrimination

All qualified applicants will receive consideration for employment without regard to sex, race, ethnicity, age, national origin, citizenship, religion, physical or mental disability, medical condition, genetic information, pregnancy, family structure, marital status, ancestry, domestic partner status, sexual orientation, gender identity or expression, veteran or military status, or any other basis prohibited by law. Leidos will also consider for employment qualified applicants with criminal histories consistent with relevant laws.