Network Engineer – Cisco & Fortinet

About the role

We are seeking a highly skilled, hands‑on Network Engineer to join our small but dynamic IT team in Oxford. The role focuses on designing, supporting and continuously improving an enterprise network built around Cisco and Fortinet technologies. You will own the security, performance and reliability of our business‑critical systems.

Key responsibilities

• Design, implement and support LAN, WAN, Wi‑Fi and VPN infrastructure.
• Manage and troubleshoot Cisco switching, routing and wireless environments.
• Administer and maintain Fortinet firewalls, VPNs and related security solutions.
• Monitor network performance, proactively identify improvement areas and resolve complex connectivity issues.
• Ensure network security best practices are applied and maintained.
• Support infrastructure projects, upgrades and migrations.
• Produce and maintain technical documentation.
• Collaborate with internal IT teams and third‑party suppliers.

Required profile

• Strong experience supporting and administering Cisco networking technologies.
• Hands‑on experience with Fortinet/FortiGate firewalls.
• Excellent knowledge of TCP/IP, DNS, DHCP, VLANs, STP, OSPF, BGP and VPN technologies.
• Proven ability to troubleshoot complex network issues in enterprise environments.
• Good understanding of network security principles and best practices.
• Experience with network monitoring and diagnostic tools.
• Strong documentation and communication skills.
• Ability to work independently and as part of a small IT team.

Required skills

• Cisco switching, routing and wireless
• Fortinet/FortiGate firewalls
• TCP/IP, DNS, DHCP
• VLANs, STP, OSPF, BGP
• VPN technologies
• Network monitoring and diagnostic tools
• SD‑WAN (desirable)
• Microsoft Azure networking (desirable)
• Wireless technologies (desirable)
• Network automation (desirable)

What we offer

• Opportunity to work with modern Cisco and Fortinet technologies.
• Varied and technically challenging role within a supportive, collaborative team.
• Professional development and certification opportunities.
• Competitive salary (£45,000‑£60,000 per year) and benefits package.