5,482 IT Infrastructure jobs in the United Kingdom

• Design, deploy, and maintain 5G core network elements and radio access network (RAN) components.
• Configure and manage network devices, including routers, switches, and firewalls.
• Monitor network performance, identify bottlenecks, and implement optimization strategies.
• Troubleshoot and resolve complex network issues, ensuring high availability and reliability.
• Perform system upgrades, patches, and configuration changes following change management procedures.
• Develop and maintain comprehensive network documentation, including diagrams and procedures.
• Collaborate with internal teams and external vendors to integrate new technologies and services.
• Conduct capacity planning and ensure network scalability to meet future demands.
• Implement and manage network security policies and measures.
• Participate in on-call rotation for incident response.
• Stay current with the latest advancements in telecommunications and 5G technology.

• Bachelor's degree in Computer Science, Telecommunications Engineering, or a related field, or equivalent work experience.
• Minimum of 4 years of experience in network engineering, with a focus on mobile networks.
• In-depth knowledge of TCP/IP, routing protocols (e.g., BGP, OSPF), and switching technologies.
• Experience with 5G technologies, including NSA/SA architecture, 5G core (AMF, SMF, UPF), and RAN.
• Familiarity with virtualization and cloud technologies (NFV, SDN, OpenStack, Kubernetes).
• Experience with Linux/Unix operating systems.
• Knowledge of relevant signaling protocols (e.g., SIP, Diameter, GTP).
• Experience with network monitoring and analysis tools.
• Strong analytical and problem-solving skills.
• Excellent communication and teamwork abilities.

• Design, deploy, and manage 5G network infrastructure, including RAN, core network, and transport elements.
• Monitor network performance, identify bottlenecks, and implement optimisation solutions.
• Troubleshoot and resolve complex network issues, ensuring minimal downtime.
• Implement and maintain network security protocols and best practices.
• Collaborate with cross-functional teams to integrate new technologies and services.
• Develop and maintain network documentation, including diagrams and configuration guides.
• Conduct capacity planning and forecasting to ensure network scalability.
• Evaluate and recommend new networking hardware and software solutions.
• Stay current with the latest advancements in telecommunications and 5G technologies.
• Participate in on-call rotation to provide 24/7 network support.

• Proven experience as a Network Engineer, with a strong focus on mobile network technologies (4G/5G).
• In-depth knowledge of TCP/IP, BGP, OSPF, MPLS, and other routing and switching protocols.
• Experience with SDN/NFV technologies and cloud-native network functions (CNFs).
• Familiarity with wireless technologies, including LTE and NR.
• Proficiency in network monitoring and troubleshooting tools.
• Experience with network security principles and tools.
• Excellent analytical and problem-solving skills.
• Strong communication and collaboration skills, with the ability to work effectively in a remote team.
• Relevant certifications such as CCNA, CCNP, JNCIS, or equivalent are highly desirable.
• Bachelor's degree in Computer Science, Electrical Engineering, Telecommunications, or a related field, or equivalent practical experience.

• Providing 3rd line technical support across the IT Infrastructure environment including cloud technologies and telephony networks. Ensuring that all incidents, problems, and requests are progressed and updated through to completion.
• Design, deploy, and maintain scalable and secure infrastructure solutions within a contact centre environment.
• Collaborate with cross-functional teams to develop and implement network policies, procedures, and best practices.

• A minimum of 5 years experience at least 3 of which must be at 3rd Line Support Engineer/Infrastructure & Network level.
• At least 2 years IT experience within in a contact centre environment.
• Excellent Microsoft administration skills to include Azure AD, Intune, O365, Entra, Exchange, SharePoint.
• Excellent experience of infrastructure components like Networking, Server platforms, storage, application structure (2-tier, 3-tier), Identity, Security (Encryption, PKI), load balancing.
• Experience of administration and troubleshooting within Office 365, Azure, Active Directory, Intune, Entra.
• Experience working with a large application estate running IIS & SQL.
• Experience managing infrastructure estates using configuration management and application management & monitoring tools. Strong & demonstrable experience migrating workloads to cloud platforms.

Expleo is standing up a new Algorithms & Infrastructure Engineering team to support Underwater Systems (UWS) in Cheadle. This is a collective capability build rather than isolated individual placements - the team will operate collaboratively across containerisation, networking, and virtualised computing domains to deliver secure, high-performance environments for advanced sonar and mission systems.

• Architect and manage secure network infrastructures supporting containerised and virtualised workloads.
• Lead on the integration of Kubernetes, Docker/Podman deployments into air-gapped defence networks.
• Configure and optimise Linux systems for high-throughput, low-latency environments.
• Design and maintain network segregation, VLANs, routing, and multicast configurations for constrained military environments.
• Support virtualisation platforms (KVM, QEMU, hypervisors) and their interaction with networking layers.
• Collaborate closely with software and algorithm engineers to ensure seamless system interoperability.

• Expert Linux networking and system internals knowledge.
• Deep understanding of TCP/IP, UDP, multicast, VLANs, routing, and network name spaces.
• Proven experience integrating containerised workloads into secure, distributed environments.
• Familiarity with defence-grade or air-gapped systems and corresponding security practices.

• Exposure to naval/sonar mission systems or similar real-time data environments.
• Experience with firewalling, ACLs, and encryption technologies.
• Network performance monitoring and optimisation within virtualised or containerised systems.

• SC Clearance

• Collaborative working environment - we stand shoulder to shoulder with our clients and our peers through good times and challenges
• We empower all passionate technology loving professionals by allowing them to expand their skills and take part in inspiring projects
• Expleo Academy - enables you to acquire and develop the right skills by delivering a suite of accredited training courses
• Competitive company benefits
• Always working as one team, our people are not afraid to think big and challenge the status quo

• As a Disability Confident Committed Employer we have committed to:
• Ensure our recruitment process is inclusive and accessible
• Communicating and promoting vacancies
• Offering an interview to disabled people who meet the minimum criteria for the job
• Anticipating and providing reasonable adjustments as required
• Supporting any existing employee who acquires a disability or long term health condition, enabling them to stay in work at least one activity that will make a difference for disabled people

"We are an equal opportunities employer and welcome applications from all suitably qualified persons regardless of their race, sex, disability, religion/belief, sexual orientation or age".

We treat everyone fairly and equitably across the organisation, including providing any additional support and adjustments needed for everyone to thrive

Network & Infrastructure Engineer - VLAN

+ Onsite in Farnborough

+ 6 month initial contract

+ 450 to 480 per day - Inside IR35

+ This role is fully onsite

Key Skills:

+ VLAN management and routing

+ Fortinet/Fortigate

+ VMWare/vCenter

We're seeking an Network Engineer with strong experience in VLAN management, routing, and firewall administration (Fortigate). You'll manage VMware/vCenter environments, Dell server iDRAC, and mixed-vendor networking (Fortinet, Dell, HPE/Aruba). The role requires hands-on oversight of on-prem systems, adherence to change control processes, and maintaining secure, stable operations across firewalls, virtualisation, Wi-Fi, and physical servers.

Skillset Required

• Networking (especially around VLAN management and routing)
• Firewall management (Fortigate)
• VMware / vCenter
• iDRAC management
• Familiarity with change control processes (to follow the client's internal procedures)

Onsite Systems

• Virtualisation : VMware
• Firewall : Fortigate 201F
• Networking : Mix of Fortinet, Dell, HPE / Aruba HPE switches
• Wi-Fi : Aruba HPE
• Physical Servers : Dell

If you'd like to discuss this Network & Infrastructure role in more detail, please send your updated CV to (url removed) and I will get in touch.

• Design, deploy, and manage the company's local area networks (LAN), wide area networks (WAN), and wireless infrastructure.
• Monitor network performance and troubleshoot issues to ensure high availability and optimal speed.
• Implement and maintain network security measures, including firewalls, VPNs, and intrusion detection systems.
• Plan and execute network upgrades and system improvements.
• Develop and document network architecture, configurations, and operational procedures.
• Collaborate with IT teams to ensure seamless integration of network services with other IT systems.
• Provide technical support for network-related issues and resolve them promptly.
• Manage network hardware and software inventory, including routers, switches, firewalls, and access points.
• Stay current with emerging network technologies and industry best practices.
• Participate in on-call rotations for network incident response.
• Ensure compliance with network security policies and industry regulations.

• Bachelor's degree in Computer Science, Information Technology, or a related field; relevant certifications (e.g., CCNP, CCIE) are highly desirable.
• Minimum of 5 years of experience in network engineering and administration.
• In-depth knowledge of TCP/IP, DNS, DHCP, BGP, OSPF, and other networking protocols.
• Hands-on experience with network hardware from major vendors (e.g., Cisco, Juniper, Aruba).
• Proficiency in network security principles and implementation.
• Experience with network monitoring tools (e.g., SolarWinds, Nagios).
• Strong analytical and problem-solving skills.
• Excellent communication and interpersonal skills, with the ability to explain technical concepts to non-technical audiences.
• Ability to work effectively in a team and independently.
• Experience with cloud networking (AWS, Azure) is a plus.

• Design, deploy, and manage core network infrastructure, including routers, switches, firewalls, and load balancers.
• Monitor network performance and security, identifying and resolving issues proactively.
• Implement and maintain network security policies and procedures to protect against threats.
• Troubleshoot network problems, analyse root causes, and implement effective solutions.
• Develop and document network architecture, configurations, and operational procedures.
• Collaborate with other IT teams to ensure seamless integration of network services with other systems.
• Plan and execute network upgrades and enhancements to improve performance and capacity.
• Participate in on-call rotation for emergency network support.
• Stay current with emerging network technologies and industry best practices.
• Manage network vendor relationships and evaluate new hardware and software solutions.
• Ensure compliance with relevant industry standards and regulations.

• Minimum of 5 years of experience in network engineering or a similar role.
• Proven experience in designing, implementing, and supporting complex enterprise network infrastructures.
• Strong knowledge of TCP/IP, routing protocols (BGP, OSPF), switching technologies (VLANs, STP), and network security concepts (VPNs, IDS/IPS).
• Experience with firewall management and configuration (e.g., Cisco ASA, Palo Alto).
• Familiarity with network monitoring tools (e.g., SolarWinds, Nagios).
• Relevant industry certifications such as CCNA, CCNP, or equivalent are highly desirable.
• Excellent analytical, problem-solving, and troubleshooting skills.
• Strong communication and interpersonal skills, with the ability to articulate technical concepts clearly.
• Ability to work independently and manage time effectively in a fully remote setting.
• Bachelor's degree in Computer Science, Information Technology, or a related field, or equivalent practical experience.

• Design, deploy, configure, and maintain complex network infrastructure, including routers, switches, firewalls, and load balancers.
• Monitor network performance and proactively identify and resolve issues to ensure optimal uptime and efficiency.
• Implement and manage network security measures, including intrusion detection/prevention systems, VPNs, and access control policies.
• Develop and maintain network documentation, including diagrams, configurations, and operational procedures.
• Plan and execute network upgrades and enhancements to support business growth and evolving technology requirements.
• Troubleshoot and resolve network-related incidents and problems in a timely and effective manner.
• Collaborate with cross-functional teams, including systems administrators and application developers, to ensure seamless integration of network services.
• Participate in on-call rotation for network emergencies and support.
• Evaluate and recommend new network technologies and solutions to improve performance, scalability, and security.
• Ensure network infrastructure complies with industry standards and best practices.
• Manage vendor relationships for network hardware and software procurement.
• Contribute to capacity planning and network architecture discussions.
• Work effectively in a fully remote setting, utilizing collaboration tools to maintain high levels of communication and productivity.

• Proven experience as a Network Engineer or similar role, with a strong understanding of TCP/IP, routing protocols (BGP, OSPF), and switching technologies.
• Hands-on experience with network hardware from major vendors (e.g., Cisco, Juniper, Arista).
• Proficiency in network security principles and technologies (e.g., firewalls, VPNs, IDS/IPS).
• Experience with network monitoring and management tools.
• Strong troubleshooting and problem-solving skills.
• Excellent communication and collaboration abilities, particularly in a remote work environment.
• Relevant industry certifications such as CCNA, CCNP, or JNCIS are highly desirable.
• Bachelor's degree in Computer Science, Information Technology, or a related field is preferred.
• Experience working in the **Staffordshire** area or remotely within the UK is required.