IT Systems & Network Administrator

Salary: £50,000 - 80,000 per year

Requirements:

• At least 5 years of experience in an IT Systems, Network Administration, or similar infrastructure-focused role.
• Proven, hands-on experience managing SonicWall firewalls, including configuration, VPNs, policies, and troubleshooting.
• Strong working knowledge of VMware ESXi / vSphere.
• Excellent troubleshooting skills across desktop, server, and network environments.
• Experience with Windows Server and Active Directory.
• A proactive approach to identifying and resolving technical issues.
• Strong problem-solving skills and the ability to take ownership of issues through to resolution.
• Excellent communication skills and a customer-focused approach.
• The ability to work independently, prioritise workload, and operate effectively in a busy environment.
• Relevant IT certifications such as SonicWall CSSA, VMware VCP, CompTIA Network+/Security+, or Microsoft certifications are desirable.
• Experience supporting multi-site or international environments is desirable.
• Knowledge of PowerShell or other scripting is desirable.
• Experience with IT infrastructure monitoring tools is desirable.
• Previous experience working within a busy operational or depot-based environment is desirable.

Responsibilities:

• Configure, manage, and maintain SonicWall firewalls, including security policies, access rules, NAT, VPN, and content filtering.
• Monitor firewall logs and network traffic to identify and respond to potential security threats.
• Carry out firmware upgrades, configuration backups, and security hardening.
• Troubleshoot network connectivity and security issues.
• Administer and maintain VMware ESXi/vSphere hosts and virtual machines.
• Provision virtual machines and manage resource allocation and performance.
• Manage snapshots, backups, migrations, and capacity planning.
• Monitor the health, availability, and performance of the virtual infrastructure.
• Support patching and ongoing infrastructure improvements.
• Provide 1st and 2nd line technical support to users across hardware, software, network, and connectivity issues.
• Investigate and resolve support tickets efficiently and professionally.
• Provide a high level of customer service to internal users.
• Document incidents, solutions, and standard operating procedures.
• Support Windows Server, Active Directory, and associated services.
• Assist with backup, disaster recovery, and business continuity processes.
• Work with external IT vendors and service providers to resolve technical issues.
• Support IT procurement and infrastructure projects where required.

Technologies:

• Active Directory
• Firewall
• Firmware
• Hardware
• Support
• NAT
• Network
• PowerShell
• Security
• VPN
• VMware
• Windows

More:

We are looking for an experienced and hands-on IT Systems & Network Administrator to join our IT team in Heathrow. This is a fully office/depot-based role with no remote working, offering a salary of £50,000 to £80,000 depending on experience. You will play a key part in the day-to-day operation, maintenance, security, and troubleshooting of our IT infrastructure, with a strong focus on SonicWall firewalls and VMware ESXi/vSphere.

last updated 33 week of 2026