Yongyong W.
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Yongyong W.

Senior iOS, Android, Windows Phone, Web developer


shanghai, China


If you are looking for a highly skilled mobile app development expert with depth of knowledge, experience of lots of apps under the belt, professional attitude, excellent communication and the highest quality code, you are viewing the right profile. At 12, I began learning program language. After graduating a excellent Chinese university in shanghai, I worked in Chinese software development company for 5 years. In the meanwhile, I developed iPhone, Android and Windows Mobile apps in a wide range of genres and some of apps became top apps in the market. Please read my skills, portfolio and client's reviews and decide yourself. You will ... morenever regret to choose me. 1) iOS, Android, Windows Phone, Cross-platform (Titanium, Phonegap) applications - Strongly understanding of C/C++, Objective C, Java, PHP, C# languages - Apps with web service integration. (XML, REST/JSON, SOAP, WSDL) - Photo effects, Audio processing, Video streaming, QRCode/Barcode recognition apps. - Apps for enterprise Database (CoreData, SQLite) - Good knowledge of smart phone (Push Notification, Camera, GPS, Google map, multi-touch) - Full experience with Third party API + amazon-s3 + Urban Airship + google + facebook + twitter + linkedin + youtube + Yelp + Parse + Twilio + payment gateways - Apps for eBook contents (epub reader, children's interactive story books, various style eBook apps, newsstand apps) - Experience with Streaming apps (Video/Audio Streaming, Video Editing, Decoding/Encoding) - From scratch to publishing app with perfect quality. - Windows 8 (Metro) and Windows Phone development. Also have good skills Windows Azure(Cloud Services, Mobile Services, SQL Databases, Storage). 2) Game development - OpenGL ES, Cocos2d, Cocos3d, Corona(Lua language), Unity3D(iPhone,Android) - Physics engine(box2d-game-engine, chipmunk)(iPhone,Android) - OpenFeint, GameCenter, In-App Purchase(iPhone,Android) - Ad integration(iPhone,Android) iAd, Adwirl, Admob, Chartboost, TapJoy, Cerebro(iPhone,Android) - Flurry, Testflight(iPhone,Android) 3) Website development - PHP, Mysql, Javascript, HTML5, JSP, Ajax(website, backend, webserivce) - Backend for mobile apps(website, backend, webserivce) - Web Service based on XML, JSON, RSS, SOAP, WSDL, REST(website, backend, webserivce) - Frameworks(website, backend, webserivce) Wordpress, codeigniter, joomla, magento(website, backend, webserivce) 4) Teamwork and Communication - Git, SVN, Basecamp experience. - Daily, Weekly meeting in English (skype) less

Yongyong W. has added 40 portfolio pieces. Create an account to review them.

Work History and Feedback

  • Feb 2013 - Mar 2013

    HTML5 mobile app developer needed
    The freelancer has made this comment private
    53 hours
    $30.00 / hr
    $1,470.00 earned

  • Dec 2012 - Mar 2013

    Upgrading an existing iOS app

    No feedback given

    90 hours
    $33.33 / hr
    $2,988.70 earned

  • Dec 2012

    iOS + PHP ---- Upgrade an existing social dating app
    Excellent contractor! Strongly recommend. Fast, responsible. Amazing English. Will hire again!
    31 hours
    $33.33 / hr
    $1,027.56 earned

  • Oct 2012

    App Developer Needed iphone and android
    i am very happy to work with yongyong won.He did good job.I will definitely work with him in future. Highly recommended.Thanks
    26 hours
    $38.89 / hr
    $1,011.14 earned

  • Jul 2012 - Oct 2012

    iOS - Frontend Designer/Developer
    232 hours
    $30.00 / hr
    $6,949.80 earned

  • Jun 2012 - Oct 2012

    iOS app dev work and submission
    Quick work, very available and responsive.
    35 hours
    $30.00 / hr
    $1,064.70 earned

  • View More (8)

Yongyong W. has more jobs to show. Create an account to review them.


Name Score (out of 5) Time to Complete
PHP5 Test 5.00 1st Place! 8 mins
Knowledge of WordPress 3.1 Skills Test 5.00 1st Place! 12 mins
Android 4.2 Skills Test 4.90 Top 10% 8 mins
Google Android Programming Test 4.60 Top 10% 22 mins
iOS 6 Programming Skills Test 3.90 Top 20% 32 mins
JavaScript 1.8 Test 4.75 Top 10% 11 mins
XML 1.0 Test 4.60 Top 30% 14 mins
Cocoa programming for Mac OS X 10.5 Test 4.90 Above Average 12 mins
Objective C Test 4.90 Top 20% 12 mins
UK English Basic Skills Test 4.60 Top 10% 16 mins
iPhone Programming OS 4.0 Test 4.75 Top 30% 13 mins
English Spelling Test (U.S. Version) 4.90 Top 20% 14 mins
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Work History

2,289 hours worked
34 jobs


More than 30 hrs/week


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