Profile image of covernal
Flag of China Shenyang, China
Member since July 18, 2014
24 Recommendations


Online Offline
Hi, I have been doing Mobile & Web development for the past 11+ years, I have plenty of experience and a great eye for software development. I had completed all job perfectly on I am proud of my 100% Completion Rate!!!. I am able to offer competitive prices and deliver great work. I would like to work with you. I will provide the best product to you as you wanted. My Skills are : - Programming Languages - Objective-C / Swift 1.0 ~ 4.1 / Java /React-Native,Js/ C++ / C# / PHP / Angular. - Mobile Programming * iOS/Objective-C/SWIFT * Xamarin ( MVVMCross for multi-platform) * Hybrid programming (Cordova, Ionic, Accelerator Titanium, React Native) * Android SDK/NDK * BlackBerry * Qt Creator 5.4 (Cross platform) - Software Engineering / Architecture * Windows / Mac OS x / Linux Software * Image processing * E-Learning System - Web * Server management * Popular PHP framework * Bootstrap & * * MySQL/SQLite Thanks for your reviewing.
$50 USD/hr
105 reviews
  • 98%Jobs Completed
  • 100%On Budget
  • 95%On Time
  • 18%Repeat Hire Rate


Recent Reviews

  • image of hugomarcvincentx Build me a script $840.00 USD

    “Ying is easy going and very much available. He really put in the work and did the best he could to accomodate me within a very short window. I recommend him and will certainly consider working with him again :)”

  • image of lappfreelancer Ionic app refinement $220.00 USD

    “Ying Y is a great developer. I am very happy to have worked with him. He is fast, precise and knows very well what he is doing. He communicates very well, and managed to quickly identify the solution to the problems. I would definitely work with him again.”

  • image of adventiaau Ongoing Ionic 1 and Angular 1 development on existing apps $1980.00 AUD

    “Great - will be again in the future!”

  • image of app4tourguide Cordova GPS multimedia (audio/video/image/text) walking tour app (zip / sqllite / gps / deviceorientation / leaflet maps / local notifications) $1820.00 USD

    “Working with Ying was definitely worth it. Although it was my first time outsourcing a project it was definitely worth the time spent. There is a learning in communication from my side, as you have to really give thought about every instruction you write. Interpreting my communication in a different way then I had intented led to minor differences in project updates, but cannot be blamed on Ying, especially since they where very quickly resolved and in the end the app we are now looking at and using in the wild is wonderful. I am very happy we picked Ying Yi for our app and will definitely work with him again for my next project. Thank you Ying!”

  • image of instantbit Python / php API €23.07 EUR


  • image of chomane1982 Build an easy to use bot to auto send Twitter direct messages, $50.00 USD

    “It was great to work with Ying. He went out of his way to do above and beyond quality of work. The best freelancer I have used. %100 will use again”


Software engineer

May 2006 - Oct 2010 (4 years)


PHD Computer Engineering

2003 - 2007 (4 years)


  • US English Level 1
  • Preferred Freelancer Program SLA
  • PHP Level 1


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