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Senior 3rd Line Infrastructure Engineer

Job in Huntingdon, Cambridgeshire, PE26, England, UK
Listing for: Leidos
Full Time position
Listed on 2026-09-14
Job specializations:
  • IT/Tech
    Systems Engineer, Systems Administrator, IT Support
Salary/Wage Range or Industry Benchmark: 62000 - 79000 GBP Yearly GBP 62000.00 79000.00 YEAR
Job Description & How to Apply Below

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.

3rd Line Engineers will;

  • 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 Net App Solid Fire or Nutanix.
  • Have excellent knowledge of SAN storage technologies such as Net App or Dell Power Store.
  • 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 data centre environments.
  • Have strong Linux system administration skills (Ubuntu / CentOS/Red Hat).
  • 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, Office
    365, 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 Micro Services 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,…

Position Requirements
10+ Years work experience
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