3rd Line Engineer

Role: 3rd Line Support Engineer

Location: London, UK (Hybrid)

Salary: £45,000 - £55,000

About the Role

We're looking for an experienced 3rd Line Support Engineer to join a growing technical team, supporting a diverse customer base across the South East. This is a hands-on role with a strong emphasis on networking, whilst also requiring solid infrastructure experience across Microsoft and virtualisation technologies.

You'll be responsible for designing, implementing and supporting customer network environments, delivering infrastructure projects, and acting as a senior technical escalation point. This role would suit someone who enjoys working across multiple technologies, solving complex technical issues and building long-term relationships with customers.

Key Responsibilities

• Design, implement and support secure, resilient customer network infrastructure.
• Configure and maintain routers, switches, firewalls, wireless networks and VPN connectivity.
• Support LAN, WAN and SD-WAN environments, ensuring high levels of performance and availability.
• Manage routing, switching, VLANs, IP addressing, DNS and DHCP.
• Troubleshoot complex networking and infrastructure issues across customer environments.
• Support Windows Server, Active Directory and Microsoft 365 environments.
• Maintain and administer VMware and/or Hyper-V virtualisation platforms.
• Deliver infrastructure upgrades, migrations, deployments and refresh projects.
• Monitor network performance, security and system health, proactively identifying improvements.
• Produce and maintain technical documentation, network diagrams and implementation plans.
• Participate in customer onboarding, infrastructure reviews and technical assessments.
• Provide both remote and onsite support, working closely with customers to deliver exceptional service.
• Collaborate with vendors and technology partners to deliver the best technical solutions.
• Assist with technical pre-sales activities and solution design where required.

About You

We're looking for someone with a strong networking background who also has broad infrastructure experience and enjoys working in a customer-facing environment.

You'll ideally have:

• 3+ years' experience in a Network Engineer, Infrastructure Engineer or similar role.
• Strong understanding of TCP/IP, UDP, ICMP and core networking principles.
• Excellent knowledge of routing, switching, VLANs, DNS, DHCP and IP addressing.
• Experience with networking platforms such as Fortinet, Sophos, Cisco Meraki or similar.
• Good experience supporting Microsoft technologies including Windows Server, Active Directory and Microsoft 365.
• Experience with VMware and/or Hyper-V.
• Excellent troubleshooting and problem-solving skills.
• Strong communication skills with the ability to engage confidently with customers.
• A full UK driving licence (preferred).

Desirable

• CCNA, CCNP or equivalent networking certifications.
• Previous MSP experience.
• Microsoft Azure experience or certifications.
• Knowledge of VoIP and telecommunications.
• Cyber security awareness and best practices.