Position: Senior Network/System Administrator
Company: Sigma
Category: Sysadmin
Experience required: 3y

REQUIREMENTS
- 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

PERSONAL PROFILE
- Analytic mindset
- Risk management skills
- Team player

RESPONSIBILITIES
- 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