CentOS Freelancers

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CentOS Job Cost Overview

Typical total cost of Upwork CentOS projects based on completed and fixed-price jobs.

Upwork CentOS Jobs Completed Quarterly

On average, 136 CentOS projects are completed every quarter on Upwork.

136

Time to Complete Upwork CentOS Jobs

Time needed to complete a CentOS project on Upwork.

Average CentOS Freelancer Feedback Score

CentOS Upwork freelancers typically receive a client rating of 4.85.

4.85
Last updated: July 1, 2015
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  1. Jupinder Singh

    Jupinder Singh Agency Contractor

    Mobile Application with 2D Games

    India - Last active: 2 days ago - Tests: 4

    I am passionate about to developing a Mobile application development specially 2D games and hybrid technology. I have more then 6 years of experience in UI/ UX interface and mobile apps. I am always on top of the current design trends and keep myself updated about latest mobile and tablets design patterns.

    Associated with: Antier Solutions Pvt. Ltd.

    $16.00 /hr
    398 hours
    4.70
  2. Andrei Volkov

    Andrei Volkov Agency Contractor

    Linux specialist (Sec/Opt/Dev, C/Perl/Python/PHP/BASH)

    Belarus - Last active: 2 days ago - Tests: 5 - Portfolio: 13

    Important: ------------------- Enhanced shield of your Web application with mod_security! Should be always. It is task #1 after installation ANY web application! ------------------- About Me and more: ------------------- I have over 16 years of work experience with Linux systems. This is the list of software and technologies with which I deal. This list is not full and expands day by day. I always can find right decisions if I found some problems. And I am always interested in looking for mostly economical and productive solutions. Of course, Cpanel, WHM, Webmin, Plesk .... I know how are working these web-wrappers and I support their. I can will tune and to make the checking of these wrappers. But that more important !! I can work without this))) Directly use configuration files of services and etc etc. Usually, it is better way on dedicated servers. ) TCP, IPv4 , IPv6, IPX ... - WiFi, WEP, WPA, WPA2 ... - SElinux, Apparmor, Smack, Tomoyo ... - LAMP ( Apache, Nginx, PHP, Perl, Mysql, Mongo), REDMINE ... - Cpanel, Zpanel, ISP ... - MySQL clustering and replication DNS servers ... - SENDMAIL, EXIM, POSTFIX (POSTFIXADMIN,MYSQL,DOVECOT,POLICYD) ... - HPC system: Torque, Maui, Moab for HPC clusters, Infiniband, FC interconnect, iSCSI, SCST, DRBD, OFED, OPENMPI ... - OpenLDAP ... - VPN with OpenVPN, PPTP, StrongVPN ... - Nagios, Zabbix, Ganglia, OSSEC ... - SVN, CVS, GIT ... - KVM, Xen, OpenStack, Proxmox ... - NBD, RAID, LVM ... etc etc During these years I have been in a large number of tasks related to administration of network devices, as well as with simple and complex server systems. I manage servers for the HPC tasks and for network infrastructure of Internet and Intranet - DNS,DHCP,*FTP,HTTP(S),MAIL etc etc. The main goals - the monitoring of the performance and the security. I also implement tasks of data backup and troubleshooting, support for the users. I have comprehensive work skills with systems based on Debian, Redhat, CentOS, SLES, OpenSuse. I've got more than 8 years of experience in developing the different software with use of C, Perl, Python, Bash, HTML on system and user levels. For example, very important skill in developing and the modification of RPM packages (rpmbuild, rebuild, kernels), custom kernels and etc etc. ------------------- Often: ------------------- How the standart service for VPS's and VDS's projects and dedicated servers: IDS, IPS, the control of contents of log's files, the control of load of the cpu, the memory, the hard disks; the backups of the databases and the files; install or update software, consultations. Emergency call via sms to cell phone. ------------------- STOP Windows and U/K/buntu etc. TIPS WITHOUT PAYMENT: ------------------- 1. VERY OFFTEN: IF YOURS WP WAS HACKED 1. disable plugins 2. execute # diff -r dir1 dir2 3. repeat for plugins if you have last version of WP code: ~ 80% cases - problems: plugin low quality (look on author: from where and who is) ~ 15% cases - problems: theme low quality (look on author: from where and who is) ~ 5% 0day of WP also you need disable all shell function in php and enable suphp/suexec modes. STOP Windows and U/K/buntu etc. TIPS WITHOUT PAYMENT: ------------------- 1. I am getting a lot questions about reliability and quality distributives/clones Ubuntu. Results on practice - Ubuntu clones - worst for server. It is truth. If you $buntu guy, I can't help you right now. I only can recommend Debian way for server. =============== 3. Nginx of course is good program. For small/middle vps. But in serious projects - apache. Nginx will be suitable for frontend. It is only practice. Always for all web application should be mod_security module. Firewall of level of web application on 7 level of OSI. Each web application/site should be under own user in environment of vps or on dedicated servers. =============== 4. By topic Wordpress. For optimisation services of OS , namely system IO(type of disks or partitions) and DB(type of engines of tables), need to use empty installation (default variants). Most problems of work WP contains in itself - customized plugins or themes. For analyze pages need begin with such services as http://gtmetrix.com. =============== Sunday - day of rest. Or in emergency case - payment with double rate. best regards, Andrei odesk.by / upwork.link PS: With love from USSR. ;-)

    Associated with: UPWORK.LINK

    $16.00 /hr
    953 hours
    4.98
  3. Rene B.

    Rene B.

    FOSS Consultant

    Mexico - Last active: 3 months ago - Tests: 3 - Portfolio: 5

    Hello, My name is Renich Bon Ciric (yeah, I know it's up there...). I'm a FOSS professional and expert GNU & Linux Systems Administrator and Integrator; specialized in RedHat/Fedora. I live in Guadalajara, Jalisco, México. I can offer my skills remotely. I am willing to work by project, part time or full time. My favorite time of day are evenings. I am a night owl and am happy to work on odd shifts. # Experience - CloudSigma: Recently. I was in charge of integrating their current software stack for the cloud. Basically KVM/Qemu hosts. - (xpert) creations: I was in charge of their LAMP servers; all successfully migrated from several ISPs into KVM/Qemu virtualized servers. - Tools Net: I was in charge of their infrastructure. Migrated from a very old VMWare installation into a KVM/Qemu setup. - Mexican Foodbank Association (AMBA): Was in charge of the infrastructure; including mail, dns and LAMP. - Fedora: I am, currently, a Fedora packager. - LinuxCabal: I started the PHP and Python groups. In charge of new projects for this non-for-profit organization. I'll synthesize a skillset for you and am happy to answer any queries or question regarding these subjects: # Basis - Systemd and SysV - Puppet - Bacula (automated backup system) # Networking and Security - DHCP and DNS (ISC of course) - iptables, firewalld, tcp wrappers, SELinux, etc # Virtualization - KVM/Qemu/Libvirt - OpenStack - GlusterFS, XtreemFS and Ceph # Web - NginX, Apache and Cherokee - MySQL/MariaDB and a little Postgress # Programming and scripting - Bash/Dash, Perl, PHP, Ruby and Python - C and C++ # Misc - Fedora Packaging (RPM) and repo generation I am happy to learn whatever is needed with a few exceptions: - Java - Oracle # CV http://cv.woralelandia.com/ # References https://www.google.com/#q=renich

    $50.00 /hr
    48 hours
    5.00
  4. Esteban Hernandez

    Esteban Hernandez

    Esteban Hernandez

    Costa Rica - Last active: 10/09/2014 - Tests: 5

    General Overview Linux Administrator with 5 years experience I am seasoned enough to know to acknowledge when I do not know something, or do not have the answer. There is never “one way” to do something, and no matter how a problem is solved, there is always a better solution. Enjoy challenges and learning. I will not charge for learning general technologies that have application beyond a contracted project. I believe in the power of the web. I believe in the power of cloud computing, and SaaS. Willing to do oncall 24x7 immediate availability. Experience Cloud Services: Amazon Web Services EC2 Elastic IP Console Manager I have recently completed a number of production server deployments to Amazon Web Service (AWS). Each migration included building a new AMI as well as exports/imports of production data. SVN migration to AWS (centOS) dotProject migration to AWS (centOS) Bugzilla migration to AWS Linux (Centos, Ubuntu, Solaris, Suse, Red Hat) Worked for software development company for 4 years maintaining and deploying a wide variety of systems and applications including: LAMP, Bind DNS, PHP, apache, mysql, LDAP, Nagios, Cacti, fortigate firewalls, Joomla, wordpress, Plesk, Jboss4, Tomcat, Oracle, PXE Installs, Vmware, Virtual Box, red hat spacewalk, Bacula, Oracle and Mysql migrations, shell scripting and general sys admin work maintaining and monitoring the data center with over a 100 servers. HP (Technical Account Manager): 1 year experience handling Level 3 linux cases with US based customers, main point of contact between HP and the clients communicating via Email, phone or video chat, helping them resolve the cases from beginning to end engaging engineers from 3rd party software if required and keeping constant communication between the parties.

    $22.22 /hr
    71 hours
    5.00
  5. Yawar Hadi

    Yawar Hadi

    Voip, asterisk, perl scripting, freeradius, linux, mysql developer

    Sweden - Last active: 07/07/2012 - Tests: 3 - Portfolio: 3

    From last two years i am working on asterisk, free radius and mysql.I developed a full voip application which consist of * Calling Card Application * Soft phone to PSTN calls * DID to Soft Phone * DID to Forwarded no. * SIP to SIP calls * Call routing besides these i add the asterisk realtime functionality using mysql database and for billing i use the free radius server. So my core competencies are asterisk, perl, python, free radius, mysql DB and working on linux plat form.

    $8.89 /hr
    75 hours
    5.00
  6. Joshua Walker

    Joshua Walker

    Drupal evangelist

    United States - Last active: 09/18/2014 - Tests: 3 - Portfolio: 4

    I make sweet web sites and applications. I Contribute stuff to Drupal: http://drupal.org/user/433663 I Contribute stuff to CiviCRM: http://civicrm.org/extensions http://drastikbydesign.com I develop web applications for businesses small and large, many of which require e-commerce abilities, while others require even further advanced features. The majority of these sites were built using the Drupal CMS. I have also written a wide range of custom modules for Drupal to: -Register domain names for a hosting resale site - (Drupal 6) -Built ACH / E-Check payment method for USAePay gateway in CiviCRM (Drupal 6, CiviCRM 3.x) -Also built the Stripe & DataTrans payment processor plugins for CiviCRM. -Integrating various 3rd party APIs (Facebook, Linkedin, Twitter, Cake Mail, VieleRETS) Aside from working with Drupal, I also maintain several servers & optimize them for speedy, responsive sites (Just click around on http://drastikbydesign.com for a teaser).

    Groups: Drupal

    $55.56 /hr
    101 hours
    4.74
  7. Chris Rivas

    Chris Rivas

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

    United States - Last active: 11/18/2014 - 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
    4.54
  8. Faisal Naeem

    Faisal Naeem

    Linux/Web Hosting/Mail/DNS/NMS Server Administrator, IT Support

    Pakistan - Last active: 12/07/2014 - Tests: 17 - Portfolio: 8

    An experienced Linux System Administrator with skills in CentOS/RHEL/Ubuntu/Fedora Server/VPS Configuration, Administration and Troubleshooting plus L2/L3 support expertise. I am having hands-on expertise to Mail / Web Hosting / Virtualization / Network Monitoring / Media Streaming / OpenGTS / DNS / FTP / Backup / Firewall Servers, Data center Administration and Server Security measures. My exposure to Amazon EC2, Linode, GoDaddy and Hostgator physical/virtual server environment is quite good. I am looking forward to utilize my experience and technical skills to offer quality work with client’s contentment. Possessing 08 years experience in Information Technology including 3.5 years experience in as System Administrator in Data Center (Systems Team) and currently working as Manager (Linux Systems). I have experience in administration of heterogeneous network with a variety of open source tools to provide an excellent IT infrastructure for organizations.

    $18.00 /hr
    12 hours
    4.70
  9. Sergiu O.

    Sergiu O.

    Technology Guru, Linux, PHP, Mysql, C, TCP/IP

    Romania - Last active: 11/14/2014 - Tests: 7 - Portfolio: 1

    I have the *top score* on the PHP5 test and I'm in the top 10% on other significant technology tests. I work with technology systems, both large an small, including but not limited to Linux servers (a multitude of distributions), a variety of PHP content management systems, various network setups of most of the popular servers/daemons from mail to files and SQL databases. My particular range of experience allows me to create job specific, performance tuned and profit generating setups for my clients. In the past years I have worked mostly on sql-based backends, from large web crawlers, a bit of text analysis, managing worker threads, seo-related software, integration with content management systems and payment gateways, most of it done with LAMP and LAMP-like setups. Professionally I have led small teams of 2-3 people for programming tasks. Linux distributions that I have experience with: -Debian / Ubuntu and derivatives -Gentoo -RedHat / CentOS and derivatives -Puppy linux and a variety of live low memory distributions for embedded purposes Programming languages: -C (I started with this around 15 years ago, also Pascal if anyone ever uses that anymore). I have not written C code in a while since I've focused on server/web based technologies. -PHP - my language of choice for most things web-side -Python - have used it a bit for linux Desktop apps -Bash for some scripting -a bit of knowledge about all the scripting/configuration languages that you would typically find on a server, from lua to zsh and whatnot -good familiarity with regular expressions and other parsers -extensively used the cURL library I understand OOP, MVC and what development processes are, have used versioning systems including CVS, SVN, GIT, I can adapt to most team workflows regarding this. Databases: -most of what I've used is in the Mysql realm, including advanced server configurations for high loads/high availability, replications, filesystem tunings, stored procedures, caching, for a while mysql design and tuning books were always on top of my desk -have also used sqlite for less intensive tasks and postgresql Regarding frontends, I have read, written, corrected and improved: -HTML of all kinds, versions either plain or within theme engines -JavaScript either plain or with jquery -CSS -GTK 2 and 3 -the old windows graphical api (the C win32 one), although I haven't touched this in years I don't consider myself a 'frontend guy' but I can and will write great, functional, usability oriented ones if need be, but I don't do logo / advanced graphics design (as seen by photoshop gurus), there should be a law against me actually drawing anything on a screen from scratch (however user interfaces and other people's images are no problem). I believe my English is excellent and so are my communication skills - on the projects I choose to work on. I often get asked things like: "-But do you know version x.y.z of some content management system? It's the latest and greatest, just came out and we need someone with 5 years experience in it!" Here's my answer to those kinds of questions: NO I DO NOT KNOW IT! I probably am not familiar with plugin X for Awesome Shopping Cart version 9123 beta using webRTC and the alpha jquery version. BUT I most certainly will be able to write great code for it and integrate it into anything if it's humanly possible. A great programmer is the one who knows, understands the inner workings of software, the 'lower level' functions and has a willingness and a process for learning, adapting, reading and using documentation, reading and understanding the code and extrapolating from previous work. If you need a programmer that has specific experience on one and only one system and disregards everything else, than I am not that guy, nor would I ever wish to be. I understand marketing, both online and offline, I know how businesses work and therefore I value your time and money should you also value mine. If you decide to throw some work my way, here are a few things that I consider important. I believe that real-time communication tools (instant messaging, skype, phone, irc) are inferior to non-real-time tools (email for example) when it comes down to getting things done. We will most likely be in different time zones in different countries. I also have some strange work hours, I sometimes work very late (or very early). Email and messages on Odesk facilitate communication by removing the time constraint and allowing a generally more structured communication to take place. I answer all messages in a timely manner but I hate it when phones and windows popping up interrupt my workflow and thought process. I prefer all real time communication to be scheduled at least one day before - that's not to say that I'm never available for chat or interviews, I just have a strong preference for things that don't interrupt.

    $35.00 /hr
    18 hours
    5.00