Profile image of chengjin880528
Flag of China Huludao City, China
Member since February 11, 2017
2 Recommendations


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✅ Awesome quality delivered, Every time ✅ On Time Delivery ✅ Complete Confident ✅ 7+ years Experience ✅ Great Communication ✅ 100% Satisfaction Guaranteed My skills: - Unity3D, C#, Swift, Objective-C, Java, - React native, react.js, redux - Virtual Reality ( HTC Vive, Oculus Rift, Google Cardboard, Google Daydream, Samsung Gear VR) - Augmented Reality ( ARKit, Vuforia, EasyAR, Wikitude, ARToolKit, Kudan, Tango) - Mixed Reality ( Microsoft Hololens, etc) - App Store submission process - RESTful API integration - Social network integration (Facebook, Twitter, Instagram, Google+, LinkedIn, Youtube APIs) - Push notification implementation - In-App purchases implementation - Subscriptions implementation - GPS location processing - Firebase - Photo/video/audio management (capturing, editing and sharing) - Backend services (Amazon Simple Storage Service (Amazon S3), Firebase, Parse,Parse Cloud Code) - Payment services (Stripe (implemented a marketplace using Stripe Connect))
$40 USD/hr
10 reviews
  • 73%Jobs Completed
  • 91%On Budget
  • 100%On Time
  • 8%Repeat Hire Rate


Recent Reviews

  • image of Said1985 iOS and Android developer needed $20.00 USD

    “great developer, he listened carefully, then delivered task just as described. will continue to work with him.”

  • image of Oleksandr I. React Native $30.00 USD

    “Good job”

  • image of Albert G. Modification on a ready made android studio app $155.00 USD

    “it was such a bad experience with this guy, forced me to pay before completing the work. hacked my code to force my leave good review before completing the project and give me the source code. he wasted a lot of my time and thanks to freelancer support they returned back my money after they discovered his cheating.”

  • image of Abdul Q. Looking for a Android Developer $55.00 AUD

    “Best developer I found, highly recommended to others!”

  • image of tugrasahiner Creating a Virtual Reality menu for an existing mobile app $155.00 USD

    “Li A. is a changing name. Do not trust him/her and never waste your time with him/her. While everything was fine at the beginnging, this freelancer insisted to start the job by an initial payment. Normally I don't but I trusted and proceed with a payment. Then, a huge silence. First changed the name to something else, then changed the photo into a guy then into a girl. Finally stated that (s)he is sick. Completely waste of time. Just stay away my friends.”

  • image of puhumight 3d cad model implementation with google tango (augmented reality android app) $27.50 USD

    “The project is not completed according to the dispute”


Mobile Manager

Oct 2016 - May 2017 (7 months)

- Managed the project, created the project plan, outlined tasks for each member to accomplish along with due dates to keep the team on schedule. - Oversaw the technical development of the team’s product, designed the prototype of the product and business model. - Ensured a customer research-centric approach to product development, identified the market opportunity, communicated with the angel investors.

Unity3D Game Developer

Apr 2015

Multiplayer Driving Simulator - Free Online Multiplayer Driving Simulator is the most extreme real time multiplayer car driving simulator on Apple Store. Drive a turbo sports car, crash it, drift it as fast as you can and burn the asphalt of the road with more people!!

Senior Mobile Developer

Mar 2015 - Aug 2016 (1 year)

At this company my main responsibilities are: Mobile applications development (iOS/Android platforms) for customers of company and for open-source solutions of company ; communication with customers; creating applications from the scratch; estimating of the projects.


Bachelor of Education

2005 - 2009 (4 years)

Bachelor of Engineering

2010 - 2014 (4 years)


Oracle Certified Expert - Java (2012)

Beijing University of Technology

Demonstrates expertise in professional Java programming. Examination requires practical and theoretical knowledge of Java development techniques and frameworks.

Appcelerator Titanium Certified Mobile Developer (2015)

California National University for Advanced Studies

IOS7,8 Developer Certificate


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