> Markdown version of [/jobs/ext/3253902-senior-3rd-line-infrastructure-engineer](https://www.wearedevelopers.com/jobs/ext/3253902-senior-3rd-line-infrastructure-engineer). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior 3rd Line Infrastructure Engineer - **Company:** Leidos, Inc. - **Location:** Huntingdon, UK (Remote available) - **Experience:** Expert - **Salary:** £75,000.0 - **Contract:** Permanent contract - **Skills:** Microsoft Windows, Artificial Intelligence, Ubuntu (Operating System), CentOS, Command-Line Interface, Cloud Computing, Configuration Management, System Configuration, Data Centers, Dynamic Host Configuration Protocol, Linux, DevOps, Domain Name System (DNS), Multi-Factor Authentication, Microsoft Exchange Server, Hyper-V, Linux System Administration, Machine Learning, Microsoft Software, Microsoft SQL Server, System Center Configuration Manager, Windows Servers, NetApp Applications, Citrix Systems, Red Hat Enterprise Linux, Standard Sql, SAP Sales and Distribution, Microsoft SharePoint, TCP/IP, Virtual Machines, Virtualization Technology, VMware Horizon View, Scripting, Load Balancing, Computer Network Technologies, Office365, Firewalls (Computer Science), Tanzu, Kubernetes, Information Technology, SDN Network, Rancher, Nutanix, Veeam, Commvault, Docker, Vmware, Microservices - **Published:** September 30, 2026 - **Apply:** https://www.adzuna.co.uk/jobs/details/5902750871 ## About the Role * High DV Developed Vetting clearance. * Excellent knowledge of virtualized environments such as VMware and Hyper-V. * Excellent knowledge of VDI environments such as VMware Horizon or Citrix. * Excellent knowledge of HCI such as NetApp SolidFire or Nutanix. * Excellent knowledge of SAN storage technologies such as NetApp or Dell PowerStore. * Excellent knowledge of backup and recovery technologies such as Veeam or Commvault. * Excellent knowledge of Windows Server environments from Server 2008 to 2025, including AD, DNS, DHCP and GPO from design to implementation and support. * Demonstrable experience supporting enterprise IT hardware in datacentre environments. * Strong Linux system administration skills, including Ubuntu, CentOS and RedHat. * Strong knowledge of TCP/IP and networking technologies, including load balancing and firewalls. * Strong knowledge of software-defined networking such as VMware NSX-T or HPE Aruba. * Good knowledge of Microsoft stack technologies such as SharePoint, Skype/Teams, MS SQL, MS System Centre, Office365, SCCM, MS Exchange and CLI tooling. * General knowledge of cloud-native application platforms and Kubernetes-based containerised applications. * Experience working on Production, Reference and Development systems and the configuration control lifecycle from development through to production. * Experience with MicroServices architecture platforms such as Tanzu and Rancher, Kubernetes and Docker. * Knowledge of 2 Factor Authentication technologies. * Knowledge or experience with scripting. * Experience producing and updating technical documentation to a high standard. * Excellent analysis and problem-solving skills. * Excellent communication skills. * ITIL 3 or ITIL 4 Foundation level or above. ## Description * Provide complex fault rectification and support for incidents on IT systems supporting key National Security outputs. * Support Problem Management, Continual Service Improvement and occasional Change Request work. * Conduct reactive and proactive maintenance, primarily on the JUNO system, and occasionally support other systems we manage. * Respond to escalations from 2nd Line Engineers and other Resolver Groups. * Conduct advanced troubleshooting to diagnose and rectify issues as they arise. * Develop technical solutions to complex issues and problems. * Liaise with stakeholders at all levels of seniority, including the customer. * Resolve issues and problems within SLA levels and ensure KPIs are met. * Ensure Cat A systems remain online and running smoothly. * Perform root cause analysis with other resolver groups, original manufacturers, users and suppliers. * Complete and record periodic maintenance using PPM and routine upgrading activities to address obsolescence issues. * Maintain and create documentation of system configuration changes and accurately record work in SD. * Assist with the configuration, installation and deployment of infrastructure components, including virtual machines and UADs. * Engage in infrastructure-related projects and change requests, contributing to implementation build and testing phases. Technologies: * Aruba * Citrix * Cloud * Docker * Hardware * Hyper-V * Support * ITIL * Kubernetes * Linux * Load Balancing * Nutanix * SQL * Security * SharePoint * TCP/IP * Ubuntu * VMware * Veeam * Windows * microservices * AI * DevOps * Machine Learning * Network ## Related Videos - [The Private AI Platform: Why Agentic Apps Need a Private Application Platform](https://www.wearedevelopers.com/videos/100162-the-private-ai-platform-why-agentic-apps-need-a-private-application-platform) - [Docker network without Docker](https://www.wearedevelopers.com/videos/1418-docker-network-without-docker) - [Unlocking the potential of Digital & IT at Vodafone](https://www.wearedevelopers.com/videos/602-unlocking-the-potential-of-digital-it-at-vodafone) - [Remote Driving on Plant Grounds with State-of-the-Art Cloud Technologies](https://www.wearedevelopers.com/videos/251-remote-driving-on-plant-grounds-with-state-of-the-art-cloud-technologies) - [Docker exec without Docker](https://www.wearedevelopers.com/videos/1094-docker-exec-without-docker) - [Discover the open source trio you didn’t expect: .NET and PostgreSQL on Linux](https://www.wearedevelopers.com/videos/2042-discover-the-open-source-trio-you-didn-t-expect-net-and-postgresql-on-linux) ## Related Articles - [How We Built a Worry-Free System That Runs for 10+ Years – And What We’d Do Again](https://www.wearedevelopers.com/magazine/751-how-we-built-a-worry-free-system-that-runs-for-10-years-and-what-we-d-do-again) - [Fully Remote Software Engineer Jobs](https://www.wearedevelopers.com/magazine/447-fully-remote-software-engineer-jobs) - [The Most Popular IT Jobs on the Market](https://www.wearedevelopers.com/magazine/376-the-most-popular-it-jobs-on-the-market) - [What’s the Difference between a Junior, Mid, and Senior Developer?](https://www.wearedevelopers.com/magazine/238-what-s-the-difference-between-a-junior-mid-and-senior-developer) - [Why Upskilling And Reskilling is Important For Developers](https://www.wearedevelopers.com/magazine/428-why-upskilling-and-reskilling-is-important-for-developers) - [IT Salaries in UK](https://www.wearedevelopers.com/magazine/288-it-salaries-in-uk)