Network Administrator (Mid/Senior)

Quick Facts

• Role: Network Administrator (Mid/Senior)

• Focus: LAN/WAN/WLAN, data center connectivity, security, segmentation, troubleshooting, and network upgrades

Description

You will maintain and develop production LAN, WAN, and WLAN services and data center connectivity using Juniper, Cisco, HPE, and UniFi solutions. The role covers switching/routing configuration, firewall and VPN administration, network segmentation with 802.1X/RADIUS and NAC, Wi‑Fi maintenance, and incident troubleshooting based on traffic, logs, and alarms. You will also plan upgrades and migrations from project and testing through rollout, decommissioning planning, and documentation.

Responsibilities

• Maintain and develop LAN/WAN/WLAN and data center connectivity

• Configure switches/routers, VLANs, OSPF/BGP routing, and redundancy/traffic control mechanisms

• Administer Check Point firewalls, security policies, NAT, and IPsec VPN (Site-to-Site and Remote Access)

• Improve network segmentation and access control, including 802.1X/RADIUS and NAC

• Maintain and troubleshoot Wi‑Fi environments, including centrally managed setups and Cisco WLC controllers

• Analyze traffic, logs, and alarms; troubleshoot outages and performance issues and handle technical escalations from Helpdesk

• Plan modernization, updates, and migrations with testing, rollout, decommissioning planning, documentation, and automation of repetitive tasks

Requirements

• Minimum 3 years of practical experience maintaining production networks; independent incident diagnosis and change implementation

• Very good knowledge of TCP/IP, addressing and subnetting, VLANs, routing, and switching; hands-on OSPF/BGP, STP/RSTP, LACP, and redundancy

• Ability to independently configure Juniper or Cisco/HPE devices; willingness to work in a multi-vendor environment

• Independent administration of network solutions from at least one listed vendor

• Experience with NGFW firewalls, access rules, NAT, and IPsec VPN (Site-to-Site and Remote Access); Check Point preferred

• Practical knowledge of WLAN plus DNS, DHCP, RADIUS, and 802.1X; ability to diagnose network access issues

• Ability to analyze packets and logs (e.g., Wireshark or tcpdump) and to use monitoring for availability/performance diagnosis

• Security-minded change management: configuration backups, topology and addressing documentation, and collaboration with other teams during incident resolution

• English for documentation and vendor support; knowledge of Linux or Windows for network diagnostics

Benefits

• Stable employment under an employment contract at a public university

• Opportunity to propose improvements and lead implementations within your area together with CUI teams

• Access to training, knowledge sharing, and development trips via Erasmus+

• Expanded benefits package, including holiday benefits, partial recreation support, private medical care, a sports program, and access to a vacation center (PG Czarlina) under PG rules