Network Engineer

Cisilion; Leatherhead; On-site; GBP 55,000 - 75,000; Full time

Job summary

Cisilion is seeking enthusiastic and experienced Network Engineer to join our Client Services team in Leatherhead. This 3rd line role focuses on managing incidents, solving complex problems and handling changes across managed service environments.

You will work with cross‑functional teams, mentor junior engineers and contribute to knowledge sharing, automation, and robust network security practices in line with industry standards.

Qualifications

• 3+ years experience in a technical Network operational support environment at a 3rd line level.
• Experience managing and supporting Network and Wireless infrastructure across Cisco, Meraki, Fortinet, Palo Alto (Strata Cloud) and Azure Networks.
• Strong knowledge of network security concepts - Firewalls, VPN, NAC, IPS/IDS.

Responsibilities

• Lead complex network troubleshooting and guide escalated incidents and problems across client environments.
• Perform root cause analysis for recurring incidents and recommend improvements.
• Collaborate with Observability engineering to identify trends in devices, stacks and environments.
• Triage technical issues across LAN/WAN (SD-WAN) and wireless networks.
• Act as the primary escalation point for junior engineers.
• Coordinate with vendors to manage shared incidents and changes.
• Manage critical network changes with minimal client disruption.
• Contribute to documentation and process improvements.
• Pursue automation opportunities to reduce manual triage.
• Document knowledge articles and network diagrams when needed.

Skills

Network operations

Troubleshooting

Incident management

Security concepts

Tools

Cisco

Meraki

Fortinet

Palo Alto

Azure Networks

Job description

We are looking for enthusiastic, experienced and driven individuals who are looking to build or maintain a lasting career in the Networking. Cisilion will be working with you to set clear goals and expectations with regards to soft and technical skills, training and accreditations to take you through support roles and further within our Client Services department.

The Network Engineer role is a 3rd Line support role whose primary responsibility is to manage and resolve Client Incidents, manage complex Problems, perform Changes and fulfil technical Requests across various Managed Service estates.

Key Responsibilities

• Lead complex network troubleshooting and provide expert technical guidance for escalated incidents and problems across managed service client environments
• Conduct root cause analysis for recurring incidents, proactively recommending improvements to enhance network reliability and performance
• Collaborate with Observability engineering to identify trends in specific devices, stacks, and environments
• Performing technical triage through to either resolution and/or vendor escalation across LAN and WAN technologies (SD-WAN) and Wireless Networks - Meraki, Fortinet, Cisco, Palo Alto
• Serve as the primary technical escalation point for junior engineers and collaborate with cross-functional teams to resolve persistent or high-impact network issues
• Working closely with 3rd parties/vendors to manage shared Incidents impacting Managed Services Clients, as well as handling RMAs and changes
• Manage and oversee critical network changes, ensuring compliance with best practices and minimizing client disruption
• Contribute to technical documentation, process improvement initiatives, and knowledge sharing within the team
• Drive network automation opportunities to minimize manual triage
• Document knowledge articles, network diagrams and other technical artefacts when required

Experience, Knowledge, Skills and Qualifications

• 3+ Years experience of working in a technical Network operational support environment at a 3rd line level ideally
• Professional technical experience of managing and supporting Network and Wireless infrastructure across Cisco, Meraki, Fortinet, Palo Alto (Strata Cloud) and Azure Networks
• Strong knowledge of network security concepts - Firewalls, VPN, NAC, IPS/IDS