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Senior Network/System Administrator

Sigma Software

    We welcome a Senior Network/System Administrator to join our IT Service department. We have a great professional team, and we are pleased to invite a specialist with solid experience and a friendly personality. 


    • At least 4-5 years’ experience on a similar position
    • Active Directory administration
    • Networking:
      • OSI knowledge
      • Routing (static/dynamic)
      • Network services — DHCP, FTP, DNS, SMTP, VPN, IPSEC, NTP, SSH, WWW
      • Firewalls (FreeBSD, Linux, Microsoft, Cisco, Juniper)
      • Routers (Cisco, Juniper)
      • Switches (Cisco, Juniper)
      • Wi-Fi (Cisco AP, Cisco WLC)
    • Operating systems:
      • Windows Server, FreeBSD, Linux, Mac OS X, Junos, iOS
    • Active Directory services:
      • AD
      • PKI
      • DFS
      • AD FS
      • Policy
    • Collaboration services:
      • MS Exchange server
      • Skype for Business
    • Monitoring:
      • Zabbix
      • Nagios
      • MS System Center
    • IP-telephony:
      • Asterisk
      • Yate
    • At least Pre-Intermediate level of English


    • Analytic mindset
    • Risk management skills
    • Team player


    • Installing software to servers
    • Configuring operating systems and services on servers
    • Server software support
    • Responding to user queries related to network or software operation
    • Monitoring of network and hardware resources usage
    • Organizing access to local and global networks and telephony
    • Ensuring timely backup and archiving of data
    • Participation in system recovery after crashes and malfunction of hardware
    • Identifying user errors and network software malfunction and system recovery
    • Network monitoring, development of network infrastructure development proposals
    • Participation in development of proposals regarding modernization and purchase of hardware
    • Monitoring hardware installation by third-party experts