Top Upwork Freelancers

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  1. Vycheslav Novak

    Linux/Unix/Network Admin with bash, python scripting skills

    Ukraine - Tests: 3 - Portfolio: 1

    - Administration and solid knowledge and background of Unix/Linux systems ( CLI ): Ubuntu, CentOS, ArchLinux, Debian, Solaris, Red Hat: - sed/awk - LFS ( Linux from scratch ) - deep understanding of Linux Memory Management concept - hardware maintenance, troubleshooting (iostat, top, vmstat, iotop, strace ), configuration - regexp - iptables - PAM - grub loader - linux tools ( tcpdump, rsync, scp, tar, strace, semanage, chcon ) - Knowledge of Linux SELinux security system - Linux FTP setup for production use ( proftpd ) - NetApp SAN administration - Configuration Management Tools ( Puppet ) - Solaris experience ( Solaris 8/10 ) - Strong knowledge Client-Server architecture ( Apache Web Server with thin configuration ) - Experience in set up and administration of mail-server: exim + dovecot + postfix + RoundCubeMail - Experience in use and configure VPN-networks (OpenVPN) - Performance tuning Apache HTTPD ( prefork/workers for high-load systems ) - Building High-availability/Cluster Environment for Production Systems ( httpd + mod_jk + tomcat(ajp_connector ) + clustering ) - Apache Clustering Configuration ( Dynamic/Static Clustering with Session Sharing; Performance tuning ) - Solid understanding of LVM concept and file systems (ext3, ext4, NFS, NTFS, FAT32 ) - Solid understating RAID concept - Proficiency in the virtualization concept and technologies (XEN, KVM, Solaris zones ) - Multi-Factor Authentication system development ( OpenOTP, TOTP ) - Strong shell scripting ( bash, ksh, python ) - JIRA and Confluence, Redmine experience - Administration Windows Servers: 2003/2008/2012 R2, Windows NT ( XP, 7, 8 ), Active Directory - Deep knowledge of the units: Cryptography Computer networks (LAN, WAN, MPLS, PPPoE, PPTP) Knowledge of VPN technologies (OpenVPN, IPSec) Network protocols (IP, TCP, UDP, PPP, ARP, ICMP, RIP, OSPF, SMTP, POP3, VLAN, SSL, DHCP, NAT) OSI model Domain Name System (DNS) LDAP Clustering Load Balancing Strong understanding of network setup, layers, configuration and facilities (port forwarding, DMZ, virtual server) - Administration and configuration network hardware switches/routers D-Link (VLAN, LACP, ACL, VRRP), FortiNet (Fortigate 80c, 60c), Cisco Catalyst ( 3750-x, 2960s), HP A5210 SI, Checkpoint R75.20/Gaia/R77 - QoS ( MQC, DSCP, CoS, ToS ) - Knowledge of Cisco IOS - Building Nagios Monitoring System ( mrtg, pnp4nagios, SNMP monitoring ) - Experience with NAS, SAN or iSCSI storage systems - Experience in Datacenter migration - Experience in virtualization system VMWare ESX - Experience in Citrix Systems - Dell Hardware Servers ( PowerEdge R710, R520, R320, R720, EqualLogic PS6210XS, SAN N4032F ) - Juniper switches OS experience ( EX4200 ) - Strong performance management, problem identification, analytical and problem-solving skills - Develop Production services monitoring Dashboard on Ruby/JS/coffeescript - Python programming language - Basic experience in SQL language ( MySQL ) - Creating application with using Python, CGI, shell scripting - Optimization and improvement of processes - 24x7 Production Servers/Applications support and maintenance - Perform deployments to QA & PROD environments Successfully completed projects: DataCenter Migration Migrate all production servers and environment to new DC, including building/deployment from scratch in new DC. Completed in short time and with minimal downtime of business application. Building Physical Infrastructure for Production systems Planning, developing, devising infrastructure for Production systems. Including enterprise requirements: redundancy, high availability, clustering, risk mitigations. 3. MultiFactor Authentication for servers Developed, created, implemented system for secure two factor authentication for all users across all Linux servers based on WebADM OpenOTP library.

    $15.00 /hr
    0 hours
    0.00
  2. Sergey Shushkov

    Java developer

    Russia - Tests: 2

    I am a Software Developer with over 5 years of programming experiences. Working with varioustechnologies (Java (SE/EE, JSP, Servlet, Portlet, Struts, JPA, Hibernate, Spring, REST Web Services, Jersey,Maven) , Web Development (Python, Django,JS,Ajax,ExtJS,AngularJS,Tomcat, Glassfish, WildFly etc.), Databases(MSSQL,PostgreSQL,SQLite), Networking(TCP,HTTP), Excel reports (with VBA,Apache POI) etc.). I'm also having experience in the following areas: SQL, OOP, Agile software development , software design and testing. And I'm learn new technologies so my technical and business skills keeps growing every day.

    $17.00 /hr
    0 hours
    0.00
  3. Nikolay Timofeev

    Linux and virtualization admin.

    Russia

    I am a Linux system administrator. Specialist of kvm-virtualization and web segments. Have more experience of working with java, node.jas and drupal project. More time administrating an internet provider's services (DNS, radius, VPN, billing and etc.), hi-load KVM based virtualization services, monitoring and user-space services. And I project and build a server rooms and conditioning systems.. My works you can see in portfolio.

    $40.00 /hr
    0 hours
    0.00
  4. Simon Jerram

    Renewable energy specialist and programmer

    United Kingdom - Tests: 4

    I have 15 years experience in software development, mostly in the field of set-top-box design, and testing. This work has involved coding in C, bug-fixing, code reviews, plus fixing various build set-ups linux start-up scripts in shell scripting, perl and python. Recently I have taken a career break and completed an MSc in Renewable Energy systems while looking after my son, so small pieces of work in the renewable sector would be welcome.

    $18.00 /hr
    0 hours
    0.00
  5. Vladislav K.

    PHP/Python/C/C++ developer

    Russia - Tests: 3

    Hello. My name is Vladislav and I'm programmer. I mainly engaged in software development in the languages C / C ++, support and maintenance of sites, development of web-scripts (PHP, HTML, MySQL) and design for the little things. Recently, a new discovery for me was the scope of development for microcontrollers. Also I have experience in networking Modbus and the 1-Wire for controlling different devices (different sensors, frequency converters, etc.) Some of my works you can see on my personal site: http://man197-soft.org

    $15.00 /hr
    0 hours
    0.00
  6. Ajay S.

    Excel VBA Application Expert, Business Plan writing

    Spain

    I do VBA EXcel application designing for fun. Have been dabbling it for a year now and feel proficient enough in creating good applications for example reporting, automatic templates which can be maintained with very less effort. Also do the business plan writing as well as other part time business related tasks. I am a MBA student.

    $9.99 /hr
    0 hours
    0.00
  7. Vitaliy Yaskov

    Vitaliy Yaskov Agency Contractor

    Ruby on Rails developer

    Ukraine

    I'm skilled Ruby on Rails developer with experience of enterprise applications development. I want to achieve the maximum ability to develop web applications.

    Associated with: Nova Soft

    $10.00 /hr
    0 hours
    0.00
  8. Justin Gorham

    Justin Gorham Agency Contractor

    Software as a Passion

    United States

    Wide array of software development ranging from front-end UI development, to back-end API and database development. I also dabble in mobile development. I am interested in taking on unique and innovative projects.

    Associated with: JGTACS

    $45.00 /hr
    0 hours
    0.00
  9. Sarthak P.

    Sarthak P. Agency Contractor

    Expert WordPress (oDesk top 10), iOS, Android, PHP, Magento | 8+ years

    India - Tests: 6 - Portfolio: 8

    Here's a quick snapshot of my skill set and experience- • 5+ years of WordPress [Top 10% on oDesk] • 5+ years of PHP, MySQL, jQuery, AJAX experience • 3+ years of iPhone OS and Android programming experience • 3+ years mobile application development • 4+ years of object oriented programming based development • Strong Grip on Xcode, Instruments, Interface Builder, eclipse • Possess intense knowledge of Objective-C, Web Services, XML, and JSON, Java • Passionate advocate of concise and simple code, designs and applications • Have experience in a light-weight, rapid turnaround engineering environment – agile specifically • Great SQL Skills working in MySQL, SQLite • Experience with consumer facing UI development My Experience I'm a Computer Engineer from India with passion and talent for my work. Over the last 5 years, I have developed a wide range of websites using PHP, MySQL, HTML, jQuery, Ajax, Javascript. The sites have been for start-up companies, medium and large business as well as for individuals. I'm very strong at OOP concepts and possess good knowledge of website designing and testing. My Qualities I ask questions whenever I'm not clear, I think out of the box and most importantly I WORK QUICKLY AND DON'T COMPROMISE WITH QUALITY. Once I have a project in my hands - I give my best. I believe honesty and good communication are most important for a successful collaboration and a long term relationship. I'm looking forward to your challenging project. :-)

    Groups: Bluehost Developers and Designers, LoadedCommerce

    Associated with: Pricus

    $20.00 /hr
    598 hours
    4.93
  10. Manish Kothari Agency Contractor

    Java & J2ee ,Intershop expert

    India

    Over 7 year of experience technical project .Four year experience in software development and over two years e-commerce project leadership. • MCA and BCA. • Proven ability to target and reach high standards. Widely perceived as a technical resource. • Exceptionally precise yet comprehensive thinker, strong team builder, skilful negotiator.

    Associated with: Ace I Solutions

    $12.00 /hr
    1,268 hours
    0.00