Network System Administrator

• Mar 2020 - Present

Technical Project Lead

• Jul 2005 - Mar 2020

• Planned and delivered technical projects to achieve client business requirements according to plan. • Designed and deployed networks for more than 20 companies based on Cisco, Netgear, Aerohive, Adtran, Watchguard hardware. More than 5 companies with multiple branches (3-12 branches 25-250 users) with network fail-over multiple media (ethernet on demand, MPLS, wireless), VPN between branches and to cloud IAAS (Azure), design and deployment of QoS policies for VOIP systems (Digium, Shoretel). • Designed and deployed of WLAN networks for multiple floors, multiple branches, warehouses. Site surveys, wireless APs planning (Aruba VisualRF, Aerohive Hive Manager), wireless equipment configuration (Aruba, Aerohive) and integration with existing networks and identity sources using Aruba, Aerohive, Ubiquity hardware and software (Airwave, Clearpass Guest / Policy Manager). • Deployed firewalls for more than 30 companies including design and deployment of security policies, layout of VPN tunnels, multi-factor authentication and integration with different identity sources (Active Directory, OpenLDAP, Cisco ACS) and 2-factor authentication services (Vasco IdentiKey, Watchguard AuthPoint, DUO security). Watchguard, Fortinet, Sonicwall, Cisco firewalls. • Deployed backup solutions (Arcserve UDP, Intronis) and backup/recovery plans. • Maintained SAN (Nimble, Netapp) with Linux and Windows servers on bare metal and in VMware environment, installed software updates. • Deployed VMware Vcenter 6.5 servers in multiple PSC scenario. • Deployed network monitoring solutions for two companies based on Nagios software running on Linux CentOS with Raspberry Pi agents. Show less

Senior System Administrator

• Aug 2001 - Jul 2005

• Maintained release management system for 5 software products based on Perl, Make, shell scripts, SVN. • Maintained network architecture with 3 remote offices: VPNs (Check Point, FreeSWan) and Firewalls (Check Point, iptables). • Configuring and support of bug tracking system (bugzilla). • Supported network based Anstispam (amvis, spamassassin, dansguardian) and Antivirus systems. • Managed corporate DNS, DHCP, PDC servers (RedHat Linux). • Network management and troubleshooting for data and voice over IP. • Analyzed network security using snort based IDS and Nessus based vulnerability scanners. • System integration of Linux kernel with additional drivers, modules and latest security patches. Show less

System Administrator

• Sep 2000 - May 2001

• Creation and maintenance of a fully redundant multi-tier infrastructure at a Co-located Data Center with a team of 4 people. Configuring of VLANs, private T1 lines to clients and Banks. • Checkpoint Firewall administration on Nokia IP440. Creation of access-lists in Cisco routers/Layer 3 switches. • Design and configuring of full redundant multi-domain mail subsystems based on Sendmail/MS Exchange and DNS system (bind). Adjustment of virtual hosting. Security updates implementation. • Creation of makefiles and SPEC files to build Sendmail and Bind rpm packages from sources under CLEARCASE vcs, and Make/Perl/Expect/ssh based scripts for remote installation and configuring of created packages and configuration files • System administration of Sun Solaris (E4500, E420R, StorEgde A5100), RedHat Linux servers. • Administration of NFS, NIS, automount, sudo, DNS, sendmail, Apache, Samba. • Network and system troubleshooting. Network monitoring with Foglight/mrtg. Show less