Senior Network Support Engineer / Administrator (Data)

Senior Network Support Engineer / Administrator (Data)
Kilmainham, Dublin (Hybrid - minimum 2 days onsite weekly)
Contract Start: July 2026 12 months initial contract with further 12 month extension approved
230 Days Per Year | Full-Time Contract Role

Are you an experienced network professional ready to take the lead in supporting one of Ireland's largest public sector enterprise network environments?

We are seeking a Senior Network Support Engineer / Administrator (Data) to join a major national organisation supporting critical infrastructure across 189 sites nationwide, serving over 7,000 users. This is an exciting opportunity to play a key role in designing, securing, and optimising a large-scale enterprise network while contributing to strategic initiatives including SD-WAN, SASE, Zero Trust, and cybersecurity compliance.

As a senior technical specialist, you will provide advanced expertise across network architecture, implementation, administration, and support. You will work on complex enterprise WAN, LAN, and Wi-Fi infrastructure, ensuring resilient, secure, and high-performing connectivity across a nationwide estate.

This role combines hands-on engineering, technical leadership, project delivery, and mentoring responsibilities.

• Design, implement, and support enterprise WAN, LAN, and wireless networks
• Troubleshoot and resolve complex network incidents and outages
• Lead network upgrades, migrations, and infrastructure improvement projects
• Configure and manage routing, switching, VLANs, IP addressing, and wireless systems
• Administer secure network access controls including TACACS+, RADIUS, ACLs, and 802.1X
• Support SD-WAN, SASE, and Zero Trust adoption initiatives
• Maintain DHCP, DNS, IP address management, and topology documentation
• Deliver root cause analysis reports and performance optimisation reviews
• Implement network monitoring and health checks using enterprise tools
• Mentor junior engineers and provide technical escalation support
• Contribute to ISO 27001 and NIS2 compliance activities
  
  

We're looking for a senior-level engineer with strong experience in:

• Complex enterprise network support and administration
• Routing & switching
• IP addressing and subnetting
• VLANs
• LAN/WAN technologies
• Wireless networking
• Network security
  
  

• HP Comware 7 switches
• Aruba ClearPass (Policy Manager, Guest, Insight, TACACS+, RADIUS, 802.1X)
• Microsoft DHCP and DNS
• HP IMC
• SolarWinds or equivalent monitoring tools
  
  

• SD-WAN deployment and support
• SASE and Zero Trust concepts
• VPNs, firewalls, secure remote access
• Cloud-integrated network services
  
  

• Strong troubleshooting and root cause analysis capability
• ITIL-aligned service delivery experience
• Vendor/OEM/ISP coordination experience
• Technical documentation and runbook creation
• Project leadership and migration planning experience
  
  

Candidates must hold one of the following (or equivalent):

• NFQ Level 8 qualification in Computer Science
• CCNP
• Aruba Certified ClearPass Professional (ACCP)
  
  

• Full-time contract: 230 days annually
• Monday to Friday, 8 hours per day
• Working hours between 08:00 - 18:00 Irish time
• Hybrid model currently includes minimum 2 onsite days weekly in Kilmainham
• Additional onsite attendance may be required depending on business needs
• Occasional out-of-hours support may be required
  
  

This is a rare opportunity to work in a high-impact senior network role supporting nationally critical infrastructure, where your expertise will directly influence the future of secure enterprise networking at scale.

If you thrive in complex environments and enjoy combining strategic design with hands-on technical delivery, we'd love to hear from you.