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SpamAssassin Upwork freelancers typically receive a client rating of 4.55.

Last updated: October 1, 2015

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Bhushan Kumar Sharma

Bhushan Kumar Sharma

Linux Servers AWS Cloud Hosting Security CPanel Plesk VOIP PenTest

India - Tests: 4 - Portfolio: 14

Since 2001, I have been dedicatedly working with Linux Operating Systems & Open Source. Services Provided ::- Deployment, Configuration, Security, Hardening, Monitoring, Performance Tuning, Troubleshooting of Linux Server Roles AWS – Amazon Web Services Migration of Servers Hosting Panels like WHM/CPanel, Plesk etc Asterisk Dialers, VOIP and Call Center Solutions Customization of Linux Kernel & Distro with Rebranding Faculty of Post-Graduate Degree in Computer Sciences. Firewalls & Gateways Linux HPC - High Preformance Clusters Remote Server Support & Troubleshooting L3/L4 Security Auditing of Servers & Websites Cloud & Virtualization Technical Writing VPN - Site-to-Site, Road-warrior Vulnerability Assessment & Penetration Testing Kayako

100% Job Success
$16.67 /hr
4,020 hours

Chris Rivas

Chris Rivas

Hosting Industry Sr Linux Admin w/ RHCE, RHCVA, MySQL DBA, developer

United States - Tests: 7 - Portfolio: 1

For more than ten years I have worked extensively in the software development and hosting industries. I am an expert Linux and Unix system engineer, and can deploy and configure any software stack that is based on Linux for optimal content delivery. I excel at MySQL database design, optimization, and administration. I am a seasoned software developer and have extensive experience with many languages including Java, Python, PHP and Ruby. I also have significant experience with customizing, deploying, and adminstering open source web applications, application frameworks, and application servers. I have worked locally, overseas, and with colleagues and clients overseas via the internet. If you look at my work history here, you will note that i 'disappeared' in February 2011. Indeed I did disappear, I was in a very bad car accident in Bangkok, Thailand, where I was living at the time, and was nto able to get out of bed or use a phone or computer for roughly a month. I now reside in Austin, TX again full-time I do not disappear typically, my present and previous employers can confirm that if you are hesitant based on feedback from 2011.

$36.67 /hr
22 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 systems (vTigerCRM, SugarCRM, Moodle, Egroupware, OwnCloud, BigBlueButton, Processmaker, OTRS, OpenXchange) - OpenSource Webshops (Magento, Oxid, Prestashop) 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
740 hours

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

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
1,781 hours

Panayotis Tsiamis

Panayotis Tsiamis

Senior Systems and Software Engineer

Greece - Tests: 7 - Portfolio: 14

Systems and Services Engineer, with 12+ years of working experience. Interested in researching, administrating, debugging, tuning and developing platforms running on UNIX like Operating Systems. Able to troubleshoot, identify and solve problems in software, network or kernel layer. Always willing to learn and experiment new technologies for creating high availliability platforms, that could described as "state of the art" or "cutting edge" technology. Specialties: • Unix Like Operating Systems Specialist (Solaris / Linux ). • TCP/IP Network technology • Very deep level of knowledge on Machines hardware and OS Kernels internals. • Troubleshoot/Tune/Debug; System Services, Operating Systems • Mail Services Expert, Qmail-Ldap Specialist. • Network: Cacti/MRTG, Nagios, Cisco Netflow • Databases: PostgreSQL / MySQL / Oracle / LDAP. • Programming: Perl, Ansi C, bash, awk, sed, php etc • Internet Services: mail, http, radius, ftp, ssh, irc etc.

$30.00 /hr
533 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
243 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

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
2,981 hours