Maintenance System Administrator

Serhiy Topchiy

Ukraine, Kharkiv, *****

Email: *.*******@*****.***

Home: +38-057-***-**-**

Cellular: +38-066-***-**-**

Skype: helldesigner

Education

**** - ****: Nacional'nij Tehnicnij Universytet 'Kharkivskij Polytehnicnij

Institut'

MSE, Metrology and Measuring Equipment

Skills

Operating systems: FreeBSD, openSUSE, Red Hat, CentOS, Debian, Ubuntu,

Gentoo,

Windows: 2003/2008/XP/Vista/7, Mac OS X: 10.4-10.6

Programming languages (basic level): Bash, PHP, Perl, Ruby, SQL, C,

html, Power Shell

Network protocols: TCP, UDP

Network services: DNS, FTP, HTTP, HTTPS

Web Servers: Apache, Nginx, Tomcat

SMTP Servers: Postfix, Qmail, Exim

FTP Servers: Pure-ftpd, Proftpd, vsftp

Firewalls: ipfw, ipchains, iptables

Network tools: iproute2, tcpdump, netcat, trafshow, iperf

Databases: MySQL, MSSQL, Redis

Network file systems: GlusterFS, NFS

Virtualization: OpenVZ, Xen, VMware vSphere, KVM

Version Control Systems: Subversion

Control panels: cPanel, WHM, Plesk

Monitoring systems: Nagios, Zabbix, Monit, Munin, Cacti

Cloud services: Amazon AWS, Nimbula Director

Load Balancers: Amazon ELB, Citrix NetScaler, HAProxy

Bug tracking systems: Mantis, Redmine, Trac, Jira

Management systems: Opscode Chef

Other software: Squid, Samba, Bind, Radius, Varnish, Wowza Media

Server

Languages: Russian, Ukrainian, English

Professional Experience

February 2012 - present: Lead Maintenance Engineer (Team Lead Role)

EPAM Systems, Kharkov, Ukraine (http://www.epam.com).

Responsibilities and Contributions:

. EPAM Cloud system auto deployment configuration

. EPAM Cloud system customers support L2/L3

. Amazon AWS maintenance

. Private Cloud based on Nimbula Director support

. Zabbix and Nagios monitoring systems support

. Automatic configuration with Opscode Chef

. Coordinate team of 5 maintenance engineers

Implemented Solutions:

Design and implement automatic configuration/management system for

EPAM Private Cloud platform with Bash, Power Shell and Chef. Support

clients hosted in a Cloud. Designed and implemented fault-tolerant, HA

environment for high loaded application with Amazon AWS.

July 2006 - present: Freelance System Engineer

Working on various projects (with individual and enterprise customers)

including:

. Desktop applications development

. Facebook applications development

. Web sites development

Responsibilities and Contributions:

. High availability systems deployment and support

. Customers servers administration

. Domain registration and web hosting support

. SSL Certificates registration and install

. Virtual Environment deployment

. Mail server support

. DNS administration

. Automation of routine maintenance jobs by writing scripts on Bash,

PHP or Perl

. Monitoring systems deployment and support

. Amazon EC2 service administration

Implemented Solutions:

Designed and implemented high availability failover system based on

OpenVZ for social media service. System includes HAproxy as a load

balancer, Varnish as a HTTP accelerator, Nginx as a web server, PHP-fpm as

an applications server and MySQL for databases. Servers are synchronized in

real-time using GlusterFS file system. Database servers are managed by

Multi-Master Manager. System also includes Java applications on Tomcat

(such as Jira Confluence and Jahia CMS).

Configured servers for Facebook highly loaded applications based on

CentOS with Apache, PHP, MySQL and Redis.

Designed and implemented continuous integrations system on Windows

based VMware virtual machine using Subversion, Delphi complier,

Finalbuilder and InstallShield.

January 2009 - July 2011: Sr. System Administrator

StellaSystems LLC. Kharkov, Ukraine (http://www.stellasystems.com),

partner of Dialog WebDesign, Gmbh. Frankfurt am Main, German

(http://www.dialog-webdesign.de)

Responsibilities and Contributions:

. Customers remote servers installation and maintenance

. Customers hosting support

. Company's production servers maintenance on Debian and openSUSE

. Production and test applications deployment and update

. Development and QA environment implementations and administration

. Video streaming support

. Domain maintenance

. High availability services support

. Monitoring systems maintenance

. Sustainability of services support

Implemented Solutions:

Implemented high available and failover system for applications using

haproxy, apache and nginx services based on Debian Linux and Xen virtual

environment. Implemented failover databases system using MySQL Multi-Master

Manager.

Developed and deployed continuous integrated system with subversion.

Installed and configured media server based on Wowza Media Server for

video streaming.

Established communications between developers, QA and deployment team

using mantis bug tracking system.

Implemented monitoring system for all equipments based on Zabbix.

July 2006 - December 2008: Sr. System Administrator

Lana Pro LLC. Kharkov, Ukraine, partner of Corrigo, Inc. San Mateo,

CA, USA (http://www.corrigo.com)

Responsibilities and Contributions:

. IIS development and QA servers administrations

. MSSQL server maintenance and support

. Corporate portal support

. Local FreeBSD gateway administration

. Corporate mail server (postfix) administration

. Network hardware maintenance

. Communication with US based company office

. Creation and maintenance virtual development environment on VMware

Implemented Solutions:

Implemented IIS web farm for development environment.

Proposed and implemented corporate portal for employees'

communications based on Postnuke CMS and SharePoint.

Created VPN based on mpd for home office works to main office using

Active Directory authorization.

July 2004 - June 2006: System Administrator

Softerra, Ltd. Kharkov, Ukraine (http://www.softerra.com/)

Responsibilities and Contributions:

. Office computers maintenance

. Office network and Internet access support

. Development and test Red Hat servers administration

. Productions sites hosting support

. Active directory domains administrations

. Hardware installing and maintenance

Implemented Solutions:

Implemented traffic load balancing between few Internet providers

using iproute2.

Configured secure network connection between two company's offices.

Developed and deployed simple web interface for manage internet

connection bandwidth. Close cooperation with developers team through Mantis

as a ticket system.

November 2003 - July 2004: System Administrator

ISP Ticom. Kharkov, Ukraine (http://www.ticom.net)

Responsibilities and Contributions:

. ISP network hardware maintenance and administration

. 3rd level support

. ISP billing systems development and deployment

. ISP environment on FreeBSD servers support

. Customers sites hosting support

. Domain registration

. Customers mail servers administration

Implemented Solutions:

Developed and deployed billing system for ISP customers using Radius,

snort, php and MySQL with simple web interface.

Implemented network solution for Dial-Up, VLAN and Leased Line

connections customers, using Cisco 3620 router.

October 2002 - October 2003: System Administrator

Concern "European". Kharkov, Ukraine (http://www.esd.kharkov.ua)

Responsibilities and Contributions:

. Local network design and support

. Local office computers support

. Windows 2003 AD domain controller administration

. Red Hat Linux servers administration

. Production sites web hosting administration

. Internet gateway support

. Mail server administration

Implemented Solutions:

Ensured smooth operation of computer networks, computers, office park,

corporate email and Internet. Implemented monitoring system based on Nagios

for all production and development servers and sites.

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