Profile image of YouSheng
Flag of China Shenyang, China
Member since 4. maj 2017
3 Anbefalinger


Online Offline
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 USD/t
26 anmeldelser
  • 100%Fuldførte jobs
  • 100%Inden for budgettet
  • 100%Til tiden
  • 17%Genansættelsesrate


Seneste bedømmelser

  • image of mikewill949 Project for Jin Y. $600.00 USD

    “Jin was amazing! I was struggling with this app we were trying to develop and within minutes he understood the issues we were having and was able to jump in and fix them. I will for sure use him again and hopefully one day I can hire him full time just for me! Great job and thank you for the help!”

  • image of SkynetItalia Project for Jin Y. $500.00 USD

    “Excellent communication, good guy indeed.”

  • image of anemone smart phone app for iOS and Android [Sealed]

    “Really good expertise with iOS and Swift. Very few coders understand all aspects of iOS. Demonstrated his knowledge and skills with this app with limited guidance”

  • image of Jayden L. Build a native iOS App $400.00 USD

    “Jin is great to work with. Has excellent English and responds to questions in a timely manner. His iOS skills have produced exactly what I was after, and next time I will hire him for both iOS and Android development. Highly recommend this developer.”

  • image of Justin T. App Improvement $600.00 USD

    “Jin is a very professional developer and easy to work with. We are continuing to use him for ongoing support. Excellent communication. Excellent work. I would hire again without hesitation!”

  • image of Justin T. HealthCare App $1150.00 USD

    “We are very pleased with the work Jin has done for us and our clients. We love his clean, high quality, professional work and will look no where else for our development needs. We look forward to continue to working with him. He is always available and conscious of our needs and strict timelines.”


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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