Top Upwork Freelancers

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  1. Valentin G.

    Valentin G.

    Software engineer (C/C++, obj-c, Python, Matlab, R, ML algorithms)

    Belarus - Tests: 7 - Portfolio: 5

    The last 5 years I have worked mostly as a C and C++ developer in a field of process automation and control (SCADA). Familiar with OOP and TDD, Design Patterns and different methods of software development (waterfall, agile). I have a good experience in the development of multithread client-server applications, windows services, dll-s and cross-platform libraries. One of the specific features of my job was writing readable and easy-portable C-code covered with tests.Another interesting feature is working in small groups dealing with frequently changing goals. The major benefit of this style of work is a great experience on all levels of software development process (from project design and requirement development to final tests). Besides, I have a great interest in the research of new technologies and IT science related fields.

    $25.00 /hr
    549 hours
    5.00
  2. Donald H.

    Donald H.

    Full-stack web developer and Python expert

    United Kingdom - Tests: 6 - Portfolio: 1

    I'm a widely-experienced web developer, and a Python expert with around 5 years' experience using the language. (It's by far my favourite programming language for most tasks!) I'm very familiar with Django and have worked on a wide variety of Django-based sites. I'm currently working part-time for VODO (http://vodo.net), a platform for distributing independent media, where I'm heavily involved in developing the front- and back-end of the site. I'm very well-versed in front-end development; I know my HTML5, CSS, JavaScript (and CoffeeScript!) well and can comfortably and efficiently implement designs from scratch and integrate them with backend code. I'm a fast and enthusiastic learner - I'm currently working on learning Haskell and the fundamentals of functional programming, as well as learning some low-level programming. (I'm really interested in trying out Rust soon!) I'm currently studying Mathematics and Physics at Durham University, in the UK. This means I've had lots of experience with LaTeX and scientific Python, as well as being a fluent user of mathematics. I'd love to take on some projects where I can utilise my mathematical experience!

    $38.00 /hr
    574 hours
    4.98
  3. Masoom Raza

    Masoom Raza

    Software Engineer, Java/J2EE Developer

    India - Tests: 3 - Portfolio: 3

    • 7 years of experience in Analysis, Design, Development and Maintenance of various J2EE applications. • Extensive knowledge of Core Java. • Dynamic Software Engineer and Team Member with rich, cross-functional exposure to the entire spectrum of SDLC functions for diverse range of processes, products / services. • Worked on Struts, Hibernate, iBatis, Spring, Zend, CodeIgniter, Ruby on Rails framework. • Worked in design pattern, OOAD, data modeling, development and integration. • Experience in Integration of various data sources like Oracle, PostGre SQL Server, SQL Server, Flat Files. • An effective communicator with exceptional relationship management skills with the ability to relate working with customers, projects managers and technical teams. • Highly motivated, quick learner, positive and goal-oriented, with demonstrated professionalism, attention to detail as well as the ability to be a good team member and able to lead a team. • Expert in in opensource chat system setup for an organization.

    $16.67 /hr
    269 hours
    5.00
  4. Angel Torres

    Angel Torres

    GIS Developer / DBA / SysAdmin / Web Developer

    Mexico - Tests: 2 - Portfolio: 5

    I am a GIS developer expert, using these technologies: Mapserver (maps on the fly), MapScript (PHP, Perl), PostGIS, Arcobjects. NET, GeoServer, GeoTools, GDAL and OGR, and OpenLayers, google maps api, leaflet. I use Front end Technologies such as JavaScript (jquery, require.js, backbone), Adobe Flex, HTML, and responsive framework Bootstrap I have developed applications using various technologies, for Desktop using vb.NET and Web Servers with Linux RHEL, CentOS, Slackware managing services and custom configuration as Apache, Tomcat, Database like PostgreSQL and MySQL, with programming languages ​​like PHP and Perl

    $19.00 /hr
    115 hours
    4.96
  5. Firman E.

    Firman E.

    Experienced Java Programmer, iMacros Guru. Others: PHP, Linux

    Indonesia - Tests: 10 - Portfolio: 2

    I've worked as a Java programmer since late of 2008. I've joined a project to develop a web application that using Spring, Tapestry and Hibernate framework. I've also been involved in a project, and responsible for handling Back Office modules using Compiere (ERP). And many other projects that I can't describe it in here. I also have some experience in the following areas: SQL, HTML, JavaScript (jQuery) and of course OOP. Sometime I 'played' with PHP and iMacros to AUTOMATE small tasks or scrape some websites. I'm also experienced in Linux OS, especially Ubuntu and other distros that based on Debian. I've setup my own VPS to running a Proxy Server using Squid, with multiple outgoing IP addresses. I can help you to install Zurmo CRM on your VPS too.

    $16.67 /hr
    16 hours
    5.00
  6. Williams Orellana

    Williams Orellana

    Professional web developer with business experience.

    El Salvador - Tests: 8 - Portfolio: 2

    I am a passionate developer with over 7 years of experience. I'm committed to building websites that are future-proof, maintainable, and standards-complaint. In all these years of continuous development I have to deal with busy and demanding environments, I have developed the ability to proactively prioritize workload while establishing sound working relationship at all levels, I am able to work both independently and proactively, I am seeking for big challenges that will allow me to show my potential and professionalism, thus giving a quality service. I am good and like to play with: HTML5, CSS3, JQuery, PHP, Wordpress, CodeIgniter, CakePHP, Zend Framework, Magento. I also have experience in the following areas: SQL, MySQL, Python, Joomla. Do you have any question about my services, please do not hesistate and contact me I would be glad ot know about you and your great projects.

    $10.00 /hr
    154 hours
    4.51
  7. Shamandura C.

    Shamandura C.

    Game Developer

    Philippines - Tests: 1

    I seek for opportunities to develop fun and exciting games and hone my programming, math, and physics skills in the process. I have a broad experience with Unity3D and have worked with Unigine as well. I was involved in MMORPG projects and wrote game flow, UI, networking, physics code as well as some shaders. I now work with a team developing mobile games for IOS. I am a front end developer but engage in back end code writing and maintenance as needed. I have used the following tools and languages: Unity3D, Unigine, UnityScript, UnigineScript, C++, Photon, Badumna, XM, SQL, PHP If you think I have the skills you need, please feel free to contact me.

    $30.00 /hr
    424 hours
    4.80
  8. Alex S.

    Alex S.

    Android Developer

    Russia - Tests: 6 - Portfolio: 11

    Professional Android Developer with over 8 years general(desktop/mobile/emedded) programming. Programming languages: Java, C/C++, PHP, HTML, asm. Fluent use of any new frameworks. Can work as standalone programmer with minimum directions from Your side, also as a good teamworker with cooperations and agile management. Sphere of experience: Top notch Android development, using latest techs, tools and analytics. Will drive your app to the top charts; Team lead; Team manager; UI/UX expert; Monetization, promotion, ads; Data protocol specialist; Beta testing, Feedback control system development; SCADA design; Engineering and design of control systems robots and machines; University background: Specialist with a degree in mechatronics engineering. Strong mathematical and system control knowledges. Spoken languages: English(fluent); Japanese (spoken). Available at: Gmail/skype/hangouts Devices: Android handsets and tablets, wearable, iOS

    Groups: Android

    $50.00 /hr
    6,017 hours
    5.00
  9. Ravinder Saxena

    Ravinder Saxena

    Game Developer

    India - Tests: 1 - Portfolio: 9

    Although this space is not enough to describe my caliber and zeal towards my work. But here is a short description about my passion in computer technology.I started programming during my PG. Despite this i am ahead from those who have spent more time than me learning all the stuffs. This shows that i am a quick learner and adapt to new technology quickly.I have been working as a game developer, developing 2D and 3D games using Unity 3D game engine. And my diligence and passion towards gaming helped me to learn a whole lot of new things.

    $20.00 /hr
    266 hours
    4.83
  10. Hassan Khan

    Hassan Khan

    Senior DBA and Application Developer

    Pakistan - Tests: 9 - Portfolio: 4

     Versatile and accomplished management professional offering over 9 years of experience in database and application server administration, and application development across various industries.  Proficient in Oracle Developer 4.5/ 2000/ 6i/ 10g, Access, VBA, Crystal Reports with Oracle, SQL Server, Access Databases on huge networked installations consisting of AIX, and Windows servers.  Recognised for hands-on experience in installing and testing new versions of the database management system and maintaining data standards, including adherence to the Data Protection Act.  Strong working knowledge of controlling access permissions and privileges; developing, managing, and testing back-up and recovery plans, and ensuring correct functioning of storage, archiving, back-up, and recovery procedures.  Showcasing exceptional organisational, multi-tasking, and analytical skills leading to effective operational excellence and communicating regularly with technical, applications and operational staff to ensure database integrity and security.  Adept at commissioning and installing new applications and customising existing applications in order to match them appropriately; and working closely with IT project managers, database programmers, and web developers.  Strong expertise in leading application development teams and administration and tuning of Oracle Databases including Container Terminal Management System, Core Banking, Oracle Financials, HRMS, Treasury, AML, KYC, Siebel, and Knowledge Manager.  Skilled initiator of successful strategies ensuring effective operational excellence and improved work ethic, culture, and performance. Received Appreciation letter from the CEO of Karachi International Container Terminal for successfully implementation of CARe project.  Excellent communicator and a top negotiator with an ability to work under pressure in fast-paced, time-sensitive environments. Proven ability to effectively interact with people of diverse nationalities; comfortable working in a multicultural setting.

    $16.67 /hr
    116 hours
    4.94