Top Upwork Freelancers

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  1. Guangming L.

    Guangming L.

    Data Scientist and R Expert

    United States - Last active: 1 day ago - Tests: 7

    I have 7 years of experience in data analysis. I'm the Chief Data Scientist and founder of Cabaceo.com, a data science consulting company in Ann Arbor, Michigan, US. I also teach people how to do data science using the R programming language at www.MasterR.org, where you can receive high quality training materials for free. I used to work as an analytic consultant for FICO, where I built scorecard for Picture People to predict customer response rate to their marketing campaigns, which doubled their ROI. I also built customer segmentations for Canadian Tire Bank, which gave the executive team a holistic understanding of their customers for the first time and resulted in a chapter of a book. More recently, I have built a linear regression model to explain the relationship between interest rate of peer-to-peer loans and borrowers' characteristics using data from LendingClub, a two-level clustering-and-randomForest model to predict human physical activities using smartphone data, a logistic regression optimization based on precision and recall, a R-implementation of the cross-sectional regression and quintile-portfolio construction methods published in the Journal of Economic Literature. I have a masters degree in Biostatistics from the University of Michigan and a bachelor's degree in mathematics from New College of Florida. I'm an avid MOOC taker, constantly learning new techniques and tools in data science and machine learning. I took all the courses in data science, statistics and machine learning from Coursera, Udacity and Edx. I respond all my messages in less than 24 hours.

    $100.00 /hr
    608 hours
    4.97
  2. Matthew S.

    Matthew S.

    Experienced Programmer (PHP, CodeIgniter, jQuery, C++, Qt)

    United States - Last active: 3 days ago - Tests: 2 - Portfolio: 5

    I consider myself a fairly decent programmer. I'm fluent in web and software application programming. Lately I've been involved mostly in web applications (using PHP). I'm more suited with web application (getting things working - and well) rather than web design (making things look pretty). The projects I've been involved with used PHP/CodeIgniter along with jQuery for browser scripting. I've also done some work with WordPress plugins. I'm also adaquently experienced in software applications. Programming stuff for Windows and Linux using cross-platform toolkits namely: Qt and wxWidgets. I've also done some low-level GUI stuff using Simple DirectMedia Layer (another cross-platform toolkit). I like computers, enjoy programming and like the challenge of coming up with good software solutions.

    $30.00 /hr
    5,614 hours
    4.91
  3. Artur Dudnik

    Artur Dudnik

    Senior Javascript/.Net Programmer

    Russia - Last active: 6 days ago - Tests: 1

    Experience & Skills & Technology stack: * JS – Native, Node.JS, JQuery, ExtJS 10+ years * .Net C#, C++ (WCF, Entity Framework, SQL Server, Sync Framework, ADO.NET, DirectX, and etc.) 6+ years * SQL Server (T-SQL, Tuning) 10+ years * remote team management 6+ years * ASP.NET MVC from RC 5+ years * SVN, Git, CVS 10+ years * Business Intelligence (BI) OLAP 2 years * Dynamic Ax; CRM; SharePoint; AD 1 year https://github.com/Sigura?tab=repositories

    $49.99 /hr
    175 hours
    4.57
  4. Daniel Z.

    Daniel Z.

    Highly skilled API integrator, PHP (ZF) Coder and Project Manager

    Poland - Last active: 4 days ago - Tests: 7 - Portfolio: 6

    Goal: Project and develop high quality apps for your success. Profile: OOPHP & Zend coding, IT consulting and business analyst, project coordinator and manager, Other skills: Apache, Bind, SSH, bashscripting, Memcached, Github, Solaris, Oracle, MySQL, Radius, AD, expert knowlegde of many *ux and windows systems Advantage: Project and implementation of many web apps. Most of it projected and developed by myself using Zend Framework, Google API (youtube, gdata), social API (twitter, facebook). Some of it integrated with operating systems or AAA software (radius, ldap). Usually Design Patterns were used (like Template Method, Version of Control, DAO, Dependency Injection, Decorator and so on). Some application built upon a structure of web services (XML, REST, JSON), some using jQuery and AJAX. Tools and technologies: Apache, radius, bind, ldap, Zend Framework, XML, SOAP, Linux, Linux daemons, Memcached, Sockets, REST, JSON, Oracle, MSSQL, MySQL, Design patterns, MVC, SVN, BASH, PHPUnit, Xdebug, Unit testing, Google Youtube API, Google Gdata API, Google Maps API, Facebook API, PayU API

    $35.00 /hr
    1,615 hours
    4.98
  5. Anton S.

    Anton S.

    Senior iOS developer

    Belarus - Last active: 2 days ago - Tests: 15 - Portfolio: 15

    Software developer for more than ten years. Started my first iOS application back when iOS SDK was introduced. Since then I had explored plenty of dark corners of iOS ecosystem and this really helps me to pick the right tool for the job. I am self-motivated agile worker. Always friendly and proactive in communications which makes me a good team member/leader. I have extended experience with following technologies: Apple native frameworks - from UIKit/Autiolayout and CoreData down to OpenGL, CoreAudio and Accelerate.framework Ad-Hoc app distribution - Testflight, HockeyApp, ; In-House app distribution Project management - JIRA, RedMine Continious integration - TeamCity, Jenkins My code contains best practices, always clean, self-documented, editable, localized and synchronized. Most of UI is in storyboard. I can use any VCS, but git is my favourite one. My experience is not limited by C / Objective-C / Objective-C++ / Swift. I have experience in backend development so it is not secret "where it all comes from" or how to report a bug. oDesk officially recognises me as one of the best mobile developers for the projects I have worked on, my work history and communication skills.

    $44.44 /hr
    1,588 hours
    5.00
  6. Sergey Y.

    Sergey Y.

    iOS / OS X verified developer

    Russia - Last active: 1 day ago - Tests: 12 - Portfolio: 10

    Over 5 years of iOS, MAC OSX and Android apps and games development experience with Objective-C, Swift, Java, C#, Unity3d. I have successfully deployed projects that involve integration of OCR (Optical Character Recognition), Parse.com, Testflight, Dropbox, Microsoft Live, Outlook, iCloud, In-App purchases, Push notifications, HandOff, image/video processing. I am also proficient with ASP.NET, JSON, XML, Python, Selenium and other technologies. My portfolio: http://indiemindie.com

    Groups: Coding Champs

    $44.44 /hr
    667 hours
    4.81
  7. Jonathan Povoski

    Jonathan Povoski

    Videographer and voice actor delivers work on time and under budget.

    United States - Last active: 6 days ago - Tests: 5 - Portfolio: 12

    With over a decade of experience creating video, film, and television projects, I provide excellent service and deliver end products tailored to your needs. The following list of services highlights my skills and result-oriented approach to your project. Video Marketing Integration – Integrating video into online marketing to increase email marketing click-throughs and to enhance website visitor experience. Video Production – Conceiving, writing, and producing marketing videos, news packages, radio commercials, and films. Video Editing – Experience includes internet marketing videos, TV commercials, and news packages. Audio Editing – Experience includes marketing videos, commercial spots for radio, and post-sound film work. Voice Over – Professional VO experience includes internet marketing videos, radio spots, news broadcasts, and narration. Motion graphics – Experience includes marketing videos, and film/TV titles. Graphic Design – Increasing audience/visitor responsiveness by redesigning websites. Logo & Business Card Design – Creating positive and lasting impressions that align with your overall design strategy. Social Media – Increasing audience/customer interaction by integrating social media into marketing.

    $55.56 /hr
    240 hours
    5.00
  8. Grigory Korpan

    Grigory Korpan

    Game/Software Developer

    Russia - Last active: 9 days ago - Tests: 5 - Portfolio: 10

    I'm an experienced game and software developer. I began from making 2d mobile games of different genres from kids books to classic platformers and side-scroll shooters. Then I worked at Unigine (unigine.com) on astonishing universal real-time 3D engine for games and simulations. I've worked on naval strategy game Oil Rush (oilrush-game.com) that came out for PC, Mac, Linux, iOS and Android. I've also worked on Valley Benchmark which apple uses to benchmark it's devices (unigine.com/products/valley) and other products of Unigine. Now I'm working on an iOS client for an amazing marketplace. I'm found of writing perfect code, solving challenging tasks and creating high-quality products. :) Key skills: - c++; - objective-c; - c#; - java; - uikit - opengl; - unity - cocos2d; - cocos2d-x; - box2d; - unigine; - unigine script; - flash, actionscript; - svn, hg, git; - scons; - python; - vim, xcode, appcode, visual studio;

    $33.33 /hr
    1,980 hours
    5.00
  9. Johnny Speiermann

    Johnny Speiermann

    Senior Software Localizer / e-commerce specialist

    Denmark - Last active: 11 hours ago - Tests: 7 - Portfolio: 1

    Localization Experience: I have been working in the localization business since 1994, and I have experience from all areas in localization as I have worked as software localizer, localization engineer, testing and engineering manager, and project manager in a large localization agency, and I have been involved in both localization and internationalization projects at a large Danish software company as well. Self-employed: In 2001 I started word gallery togehter with my partner. Services: * Translation and localization services related to IT. English to Danish translation. * Linguistic services including quality assurance, creating style guides and glossaries * Online marketing services like keyword research, ad translation, content creation * Experience in SEO and CRO - we have been involved in a number of webshops and know the importance of well-written content with focus on driving traffic and converting visitors to customers. CAT Tools / Translation Tools / Localization Tools: * Microsoft LocStudio * Microsoft Helium * Microsoft LEAF * Smartling * Google Translator Toolkit * Lionbridge Translation Workbench / Geoworkz * Catalyst * memoQ

    Groups: Certified Translation Professionals

    $66.67 /hr
    120 hours
    4.85
  10. Aleksandr Tolstikov

    Aleksandr Tolstikov

    Drupal / PHP expert

    Russia - Last active: 11 hours ago - Tests: 4

    Over 8000 hours on oDesk (only Drupal related). Highly motivated, goal-oriented, hands-on senior software engineer with extensive technical skills and over 15 years of experience in software development. - Expert knowledge of Drupal CMS; - In-depth knowledge of systems architecture and software design methodologies; - 10+ years of experience in web application development using PHP; - Extensive experience in relational database management systems, mainly with MySQL; - Experience in Linux systems administration; - Strong understanding of networking/Internet protocols and formats; - Experience in architecting, implementing and maintaining full-text search platforms;

    Groups: Bluehost Developers and Designers, Drupal

    $40.00 /hr
    8,388 hours
    5.00