Network Security Support Engineer

KERV Interactive; Greater London; On-site; GBP 45,000 - 65,000; Full time

Job summary

Kerv Interactive is seeking a Network & Security Support Engineer to join the Network Support Team in a hybrid London role. You will provide advanced triage, incident response, and change implementation, acting as an escalation point for junior engineers and coordinating across SD-WAN, firewall, routing, and ISP management domains.

The role requires 4–5 years of experience in network and security support, ITIL principles, and hands-on work with technologies such as SD-WAN, Fortinet, Zscaler, and

Qualifications

• 4–5 years’ experience in a network & security support role.
• ITIL Service Principles.
• SD-WAN deployment & troubleshooting.
• Security technologies (firewall policies, IPS/IDS, web filtering, secure web gateways).
• Advanced routing (OSPF, BGP, MPLS).
• Switching (Layer 2/3).
• ISP circuit management.
• DDI (DNS/DHCP/IPAM).
• Monitoring tools (SNMP, API-based platforms).
• ITSM platforms (Autotask, ServiceNow).
• Technical Skills: VeloCloud, SilverPeak, Fortinet, Zscaler, Infoblox (training provided for gaps)

Responsibilities

• Provide advanced support for network and security incidents & service requests
• Lead implementation of change requests and project tasks
• Act as an escalation point for Level-1/2 engineers, providing guidance and mentorship
• Troubleshoot complex networking/security issues across customer environments
• Manage ISP circuits and liaise with providers as needed
• Maintain high-quality documentation and ensure knowledge sharing within the team
• Participate in the out-of-hours on-call rota and flexible shift coverage

Skills

SD-WAN deployment

Firewall policies

Advanced routing (OSPF/BGP/MPLS)

Switching L2/L3

ISP circuit management

DNS/DHCP/IPAM

Monitoring tools (SNMP, API)

ITIL Service Principles

ITSM platforms (Autotask, ServiceNow)

VeloCloud

Fortinet

Zscaler

Infoblox

Tools

Autotask

ServiceNow

SNMP

API-based monitoring

Job description

Please note: This is a hybrid working role which will require to attend an office based in Central London twice a week.

About Kerv Connect Cloud

You’ll be part of the Network Support & Engineering team in Kerv Connected Cloud. The Connected Cloud team brings together deep expertise in cloud, networking and managed services to help organisations modernise and run their infrastructure with confidence. From data centres to branch networks and cloud platforms, we design secure, automated environments that are built to scale. It’s all about creating resilient foundations that keep businesses connected, supported and ready for what’s next.

All About You

We’re looking for an experienced Network & Security Support Engineer to join our Network Support Team. This role requires at least 4–5 years’ experience supporting complex customer environments with technologies such as SD-WAN, Firewalls, Routing (OSPF/BGP), and ISP management.

You’ll be part of a high-performing team, providing advanced triage, incident response, and change implementation, while acting as an escalation point for junior engineers.

Your part to play

• Provide advanced support for network and security incidents & service requests
• Lead implementation of change requests and project tasks
• Act as an escalation point for Level-1/2 engineers, providing guidance and mentorship
• Troubleshoot complex networking/security issues across customer environments
• Manage ISP circuits and liaise with providers as needed
• Maintain high-quality documentation and ensure knowledge sharing within the team
• Participate in the out-of-hours on-call rota and flexible shift coverage

Required Expertise

• 4–5 years’ experience in a network & security support role
• ITIL Service Principles
• SD-WAN deployment & troubleshooting
• Security technologies (firewall policies, IPS/IDS, web filtering, secure web gateways)
• Advanced routing (OSPF, BGP, MPLS)
• Switching (Layer 2/3)
• ISP circuit management
• DDI (DNS/DHCP/IPAM)
• Monitoring tools (SNMP, API-based platforms)
• ITSM platforms (Autotask, ServiceNow)
• Technical Skills: VeloCloud, SilverPeak, Fortinet, Zscaler, Infoblox (training provided for gaps)

What You Bring

• Strong technical problem-solving and troubleshooting skills
• Ability to create and maintain high-quality documentation
• Excellent communication and customer service skills
• Time management and task prioritisation in fast-paced environments
• Professional, proactive, and collaborative approach

You will live the Kerv values…

• Think Customer First
• Team is everything
• Spread good vibes
• Build future
• Do the right thing

At Kerv, we’re building something special and we’re building it to last. We want everybody to feel valued, included and love working together. With an uncompromising pursuit of amazing employee experience, we always strive to do the right thing. We believe and will relentlessly promote and support the power of diversity, equality and belonging, through collaboration and creating exceptional solutions together.