Senior Network Engineer (Fortinet)

Adecco; Liverpool; Hybrid; GBP 75,000 - 98,000; Full time

Benefits offered by this job

Hybrid work model

Free onsite parking

Job summary

Adecco is seeking an experienced Senior Network Engineer to join our infrastructure team in Liverpool on an initial 6-month contract. The role is hands-on, covering design, implementation and support of enterprise networks with FortiGate firewalls.

You will perform monitoring, incident response, root-cause analysis and collaborate with security and server teams. The position offers hybrid work (minimum 3 days onsite) and an umbrella rate up to £470 per day.

Qualifications

• Strong hands-on experience administering FortiGate firewalls.
• Experience with security policy management, VPNs, remote access and firewall troubleshooting.
• Enterprise-scale LAN/WAN support and administration experience.
• Data centre networking experience.
• Routing and switching expertise.
• Strong knowledge of TCP/IP, VLANs, DHCP, DNS, NTP, OSPF and BGP.
• Experience with network monitoring, diagnostics and performance optimisation.
• Experience with incident investigation and problem management.
• Experience with high availability and resilient network architectures.
• Experience with network segmentation and security zoning.
• Experience with disaster recovery and business continuity networking.
• Experience with load balancing and failover technologies.
• Fortinet FCP / NSE certification desirable
• CCNP Enterprise certification desirable
• ITIL Foundation certification desirable

Responsibilities

• Provide BAU support, maintenance and proactive monitoring across the network infrastructure.
• Troubleshoot and resolve network incidents, service degradations and outages.
• Perform root cause analysis and implement permanent fixes.
• Administer and support FortiGate firewall environments.
• Implement approved network changes, upgrades and security improvements.
• Work closely with infrastructure, server and security teams to deliver technical projects.
• Maintain high standards of documentation and operational procedures.

Skills

FortiGate administration

Firewall troubleshooting

LAN/WAN administration

TCP/IP networking

Routing & switching

Network monitoring

Incident investigation

Disaster recovery

High availability

Network segmentation

Load balancing

Education

CCNP Enterprise

ITIL Foundation

Fortinet NSE/ FortiGate certification

Tools

FortiGate

Job description

Salary: £? - ? per year

Requirements:

• Strong hands-on experience administering FortiGate firewalls
• Experience with security policy management, VPNs, remote access and firewall troubleshooting
• Enterprise-scale LAN/WAN support and administration experience
• Data centre networking experience
• Routing and switching expertise
• Strong knowledge of TCP/IP, VLANs, DHCP, DNS, NTP, OSPF and BGP
• Experience with network monitoring, diagnostics and performance optimisation
• Experience with incident investigation and problem management
• Experience with high availability and resilient network architectures
• Experience with network segmentation and security zoning
• Experience with disaster recovery and business continuity networking
• Experience with load balancing and failover technologies
• Fortinet FCP / NSE certification desirable
• CCNP Enterprise certification desirable
• ITIL Foundation certification desirable

Responsibilities:

• Provide BAU support, maintenance and proactive monitoring across the network infrastructure
• Troubleshoot and resolve network incidents, service degradations and outages
• Perform root cause analysis and implement permanent fixes
• Administer and support FortiGate firewall environments
• Implement approved network changes, upgrades and security improvements
• Work closely with infrastructure, server and security teams to deliver technical projects
• Maintain high standards of documentation and operational procedures

Technologies:

• Firewall
• FortiGate
• Support
• ITIL
• LAN
• Load Balancing
• Network
• Security
• TCP/IP

More:

We are seeking an experienced Senior Network Engineer to join our infrastructure team on an initial 6-month contract, with strong potential for extension. This is a hands-on engineering role focused on supporting, maintaining, troubleshooting and enhancing a complex enterprise network environment. The role is based in Liverpool with a hybrid working model of a minimum of 3 days per week onsite, Monday to Friday, free onsite parking, and occasional out-of-hours work to support planned changes, maintenance activities and major incidents. The assignment offers up to £470 per day through an umbrella arrangement, with potential flexibility for the right candidate.

last updated 38 week of 2026