Ergo is looking for a skilled Senior Network Administrator to join our high-performing team based with a major client based in Dublin city. This is a permanent hybrid role, offering the flexibility to work both onsite and remotely. If you thrive in enterprise or MSP environments and want to make an impact, we'd love to hear from you.What will you do?Configure, deploy, and support enterprise-level routing & switching solutions (2nd/3rd line)Collaborate across teams to align IT initiatives with business goals and compliance standardsImplement and optimise network security (firewalls, VPNs, IDS/IPS, NAC, Web Filtering)Manage multi-vendor environments: Cisco (IOS, IOSXE), Juniper (JunOS), Fortinet (FortiOS)Ensure high availability and disaster recovery alignmentUse monitoring tools (e.g., SolarWinds) to maintain performance and preempt issuesDocument network changes and present Method of Procedure docs to CABWhat do you need?5+ years in enterprise-level network administrationBachelor's degree in Computer Science, Engineering, or related fieldDeep expertise in LAN/WAN/WLAN troubleshooting and root cause analysisStrong grasp of protocols: TLS/SSL, TCP/IP, BGP, OSPF, 802.1XExperience in Data Centre network design and operationsProficiency with network monitoring and performance analysis toolsExcellent documentation and communication skillsCertifications: Cisco CCNP and/or Juniper JNCIP (or equivalent)