Image de profil de YouSheng
Drapeau de China Shenyang, China
Membre depuis le 4 mai 2017
3 Recommendations


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My Main Expertise; - Design and develop Native iOS/Android applications using Swift, Obj-C, Java - Hybrid app development using React native, Ionic - Have extensive knowledge and experiences in OOP(Object Oriented Programming) Architecture - Expert in Multi-Threading, Client/Server Programming, Database Programming, Networking - Building backend service using Php(Laravel, Codeigniter), Node.JS, Python. - Database Programming (MySQL, Sqlite, Realm, MongoDB, Dynamo, PostgreSql) - Social Media Integration, Geo-Location, GPS tracking, Payment gateway integration. - Cloud Backend service integration such as Firebase, AWS, QuickBlox ... - Image/Video processing using OpenCV, OpenGL, 3rd party plugins. - High Web development skill in HTML5, Javascript, BootStrap, Php, Angular. - Server Management (AWS EC2, Digital Ocean, Heroku) - Source Version Control(Git/Bitbucket/SVN and etc) - Task/Team Management tool (Github, Trello, Jira, Slack) - Bug tracking system(Instabug, Sentry, Bugsnag)
$50 $ US / h
31 commentaires
  • 100%Travaux complétés
  • 98%Dans le budget
  • 97%À temps
  • 23%Taux de réembauche


Commentaires récents

  • image de Omaralawar Project for Jin Y. $200.00 USD

    “speaks good english and easy to communicate”

  • image de ABChelp Help me finish my App €376.00 EUR

    “Jin is an excellent programmer, we highly recommend Jin for his expert knowhow in Xcode! He is innovative and impulsiv, that meaning he will an answer quickly and work fast! Our work in abchelp as/corp. is to digitalise medical emergency care for very sick people, thank you Jin for saving lives with us! <3”

  • image de pbidev Project for Jin Y. $100.00 USD

    “Jin is Very knowledgeable.”

  • image de liranaba Android app developer $200.00 USD

    “Well experienced skillful app developer. He is willing to work hard to complete the project on time and deliver top quality result on time! On top of that, Yousheng understands a customer need and can explain the process to new app developers like me.”

  • image de mikewill949 Project for Jin Y. -- 2 $400.00 USD

    “Great job! I have worked with him several times in the past and every time he is trustworthy and able to complete project very quickly. Hands down the best coder I have ever worked with! A+ work every time!”

  • image de alanluong66 A GPS IOS App $800.00 USD

    “My first time on freelancer and I’m so glad that I’ve chosen Jin as developer. Not only finish on time and deliver high quality, he also gave me suggestion to approve my project for better user experience. Jin understood what I wanted for my project quickly without me providing much detail. I will definitely have him again for my next project. Strongly recommend to other employers. Thank you for the great work Jin.”


Senior Software Engineer

Sep 2010 - Jun 2014 (3 years)

SoftWare Development, Service & Consulting and Technical Support.


Bachelor of Computer Engineering

2006 - 2010 (4 years)


Graduation certificate (2010)

Liaoning University

Graduation certificate of the Liaoning University


Semantic validation of environmental observations data Environmental Modelling and Software.

In this paper, we focus on one such language, the Water Data Transfer Format (WDTF), and present an approach for validation of WDTF data contents. We show that by using Semantic Web technologies, we can express those constraints not captured by WDTF and check their consistency with respect to data through a query reduction technique that allows existing reasoners to be used for data validation.


  • iPhone Development 1
  • US English Level 1
  • Android 1
  • PHP Level 1
  • Preferred Freelancer Program SLA


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