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SpamAssassin Upwork freelancers typically receive a client rating of 4.55.

Last updated: October 1, 2015

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Kristian B.

Kristian B.

Linux administrator/support technician | cPanel certified

Croatia - Tests: 6

My main field of work is linux administration and user support in the webhosting environment. There's a lot of control panels I work with in this field but most common are whm/cPanel, whmcs, Plesk, virtualmin. If needed, I can learn to use any other control panel quite fast. From the operating systems, I have worked with a lot of gnu/linux flavors. e.g. centos, debian, ubuntu, cloudlinux ... My work can be divided to: 1. Setup of various services ( like above control panels, custom setups with nginx, varnish etc) 2. Troubleshooting various user problems ( e-mail problems, hacked web servers and web pages) 3. Migration of web sites from one host to another, using same or different control panels. 4. Optimization and security hardening of already setup servers. If you think that I can help you, feel free to contact me and I will be happy to have a look through your problem/proposal and let you know if I can help you out.

100% Job Success
$25.56 /hr
105 hours

Cedomir Nikolic

Cedomir Nikolic


Macedonia - Tests: 7

Hello, I'm Chedomir Nikolikj and I'm an experienced Senior Systems Administrator for 9+ years. Have worked in a lot of projects that involved the following technologies, their integration, administration, maintenance and troubleshooting : Linux Administration - OS (Debian, RedHat, Solaris, FreeBSD) & related distributions (Ubuntu, Centos, SLES) - LDAP (OpenLDAP, 389DS) - Web Server (Apache, Tomcat, Nginx) - Web Frontend (cPanel, Wordpress, Joomla) - Web Proxy (Squid) - File Server (Samba) - DB Server (MySQL, Oracle, PostgreSQL) - Mail Server (Postfix, Dovecot, Exim, Courier, Dbmail) - Monitoring (Nagios, Cacti, Zabbix, Zenoss, The Dude) - BASH & PHP scripting - Open source applications (vTigerCRM, SugarCRM, Moodle, Magento, Egroupware, OwnCloud, BigBlueButton, Processmaker, OTRS, OpenXchange) Windows Administration - OS Desktop (98se, Millennium, XP,Vista,7,8) - OS Server( NT4.0, 2003, 2008) - DB Server (MSSQL 2000, 2005, 2008) - Mail Server (Exchange 2003, 2007, 2010) - Microsoft Active Directory - Microsoft Sharepoint - Office + Tools ( 97, 2000, 2003, 2007, 2010) - Antivirus&AntiSpyware (Kaspersky, AVG, Avira, NOD32, ClamAv, Amavis, Spamassasin) - Backup (Acronis, Bacula) Data Networks Administration - Cisco Switching (3500xl, 2950, 3400me) - Cisco Routing (2600, 2800, 7600) - SOHO (D-Link, Linksys, Airlive, Planet, Thompson and others) - Alcatel Switching (OmniSwitch 6200, 6400, 6800) - Alcatel Routing (OmniAccess 700) - Mikrotik & Router OS Telco Networks Administration - Alcatel (OXO, OXE) - Cisco (AS5400XM) - VoIP (Asterisk, Openser, Elastix, FreePBX) Virtualization - VMware 4,5,6 - Hyper-V - OpenVZ - KVM - ProxMox

100% Job Success
$22.22 /hr
713 hours

Aleksei Tcelishchev

Aleksei Tcelishchev

Web/Mobile Software Engineer/Developer

Russia - Tests: 5

grow up into independent successful Web/Mobile Software Engineer/Developer > from hardware power supply up to public social clouds > imagine future trends looking right now around the roots > growing up and supporting internet web projects and 'ria' apps > providing integration for different types of solutions > establishing links and designing overview Software: Programming and scripting languages: script - ECMAScript, VBScript, JavaScript, JS Frameworks (JQuery, KineticJS, libcanvas) server side - Java SE, PHP, python, sh/zsh/bash, awk/sed/perl Development and maintenance of web applications based on: WordPress, Joomla, Drupal, Symfony2 framework, Yii framework SQLite, MySQL, Memcache PHP, XML, XSLT, HTML, CSS/JavaScript Servers administration: AWS EC2 instances PBAS, HSPc, Virtuozzo, Plesk VMWare ESX/vSphere Apache, MS IIS, Tomcat Qmail, Sendmail, MS Exchange, MailEnable MS DNS, Bind MS Active Directory Nagios, Zabbix, Bacula Database administration: Oracle, Interbase, MSSQL, MySQL OS Administration: MS Windows (Desktop&Server versions) Linux (RedHat & Debian based distros) HP-UX, Solaris Hardware: Designing and developing IT infrastructures: Public Telephone Networks, VoIP complexes local and distributed networks various connection channels (LAN, ISDN, xDSL, WiFi, broadband) Buildling, configuring, installing, maintaining servers (HP, Sun, Intel, Dell, IBM), network equipment (D-Link, Cisco), workstations Diagnostics and removal of hardware problems Workflow: Gathering, analyzing and documenting tech requirements, development tasks, product description; software re-engineering Participation in official public correspondence and other communications Planning and estimating

93% Job Success
$18.88 /hr
234 hours

Leonardo Soares

Leonardo Soares

Networking and Server Expert

Brazil - Tests: 8 - Portfolio: 3

**** Over 1300 hours worked @ UpWork ***** You have just found an outstanding networking Expert with 15+ years of hands-on experience! I do my best to provide an excellent service to my clients. I am always available through Skype and phone to give feedback to my customers. I also have extensive experience with Cisco, HP networking hardware and technologies, Virtualization (Vmware), Firewalls and Microsoft Servers Certifications: * CCNA - Cisco Certified Network Associate * MCSA - Microsoft Certified Systems Administrator * 3Com Certified Enterprise LAN Expert * HP Certified Instructor * HP AIS Network Infrastructure Spamassasin, zimbra, Microsoft 2012 server, vmware, cisco, router, switch, firewall, Microsoft Exchange, McAfee EPO, Security.

$33.00 /hr
1,313 hours

Claro Osena III

Claro Osena III

Expert Linux/Windows Server Admin with Web development background

Philippines - Tests: 3 - Portfolio: 2

I am a BS Computer Engineering graduate with a highly technical expertise on Linux and Windows Server Administration. RELEVANT QUALIFICATIONS Unix/Linux/Windows installation and server configuration services Unix/Linux/Windows Firewall and System Security Unix/Linux/Windows User Management Configuration of Email, DNS, File, Database, Virtualization, Proxy servers Webhosting Administration (cPanel, Plesk, DirectAdmin) Web development background using PHP

100% Job Success
$15.56 /hr
1,777 hours

Mikolaj R.

Mikolaj R. Agency Contractor

PHP Developer with Frond-End and JavaScript skills

Poland - Tests: 16 - Portfolio: 18

I have worked as a PHP developer for about 7 years for now. My experience in working on a wide range of projects allowed me to work with large corporations like Adidas, Reebook and Unilever - that kind of clients are very demanding and expect performance to the highest level. Thanks to that cooperation I know how necessary thing is good communication. I worked in a team of developers as well as on my own, additionally, I have experience as a team leader. Worked on small projects and some bigger ones that took over a year to complete. I am very much familiar with the latest technologies such as: PHP 5x (OOP), MySQL 5x/Postgresql 8+ (usually with ORM if needed), MVC Frameworks, jQuery, Mootools, DHTML, CSS3, HTML5, Youtube/Facebook/Twitter API to integrate projects with social media. All my applications are SEO optimized to play good with google and easy to work with SEO companies.

Associated with: Polcode

94% Job Success
$32.00 /hr
2,967 hours

Vitaliy Nogin

Vitaliy Nogin

Linux, Cisco administrator

Ukraine - Tests: 1

PROFESSIONAL EXPIRIENCE: EQUIPMENT: 1 Server hardware by IBM and HP, IBM-PC compatible. 2 CISCO switches and routers (800,1700,1800,2600,2800,3560,3600,3750,7200,etc series) 3 Intel switches. 4 Digital Super Hybrid Telephone Systems iDCS-500 and OfficeServ 7200 by Samsung 5 Zeroshell, 3Com, D-Link, Zyxel, MikroTik. OPERATING SYSTEMS: 1 UNIX, Linux, FreeBSD, Solaris 2 Microsoft Windows Server 2003/2008 NETWORK PROTOCOL: 1 HTTP, SNMP, SMTP, TELNET, FTP, SSH, SCP, SMB, NFS, DNS, NNTP, POP2/POP3, IMAP, UUCP, NIS, NFS, SOCKS5 etc. 2 SSL 3 RPC, NetBIOS 4 TCP, UDP, GRE 5 IP, BGP, OSPF, RIP, PPP, ICMP, ARP 6 Ethernet, X.25, Frame Relay, ISDN, MPLS, IEEE 802.11 PROGRAMMING LANGUAGES: Perl, bash, csh, awk, expect, PHP, Pascal, Delphi, C++, Visual Basic, HTML, Java

$15.00 /hr
0 hours

Valery S.

Valery S.



Worked since 2001 in a military HydroMeteo Center as a sysadmin. Had the 11-year experience in administering Meteorological software on both Linux and Windows9x/NT platforms. This included setting up dedicated modem lines with our clients/uplinks, receiving Meteorological photo snapshots from radio ether, from Geo-stationery or NOAA (polar-orbital) satellites, as well as Maintaining two Meteo Info routing complexes, passing meteo textual and facsimile info to its peers, a GIS Meteo Database server with a number of client programs on the working places of Synoptics and Hydrologists. From Aug 20, 2012 to May 17, 2013, worked in AfterLogic corp. ( as Admin/Software engineer. Intimately worked with Dovecot, to integrate it into AfterLogic Mailsuite/Collaboration Server/Aurora (see AfterLogic site) Wrote several mail filters in perl. (One of them was for restricting a cellular phone user to respond only one time to a MMS message. This was a mail filter for Postfix

$15.00 /hr
0 hours

Harshad S.

76% Job Success
$11.00 /hr
123 hours