Profile image of YouSheng
Flag of China Shenyang, China
Member since May, 2017
2 Recommendations


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/hr
22 reviews
  • 100%Jobs Completed
  • 100%On Budget
  • 100%On Time
  • 21%Repeat Hire Rate


Recent Reviews

  • 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 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.”

  • image of Justin T. Project for Jin Y. -- 13554 $200.00 USD

    “Jin has continued to impress us with his work and efficiency. He has provided us with on time on budget work with around the clock support. We look forward to our next project with him”

  • image of Justin T. Project for Jin Y. -- 4 $200.00 USD

    “Jin has been a great resource to us. For every expansion that we have wanted to add to our app Jin has delivered. We can always count on him to be on time and on budget, going the extra mile in every way.”

  • image of ste821 Android Apps $277.50 USD



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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