Profile image of chengjin880528
Flag of China Huludao City, China
Member since February 10, 2017
3 Recommendations


Online Offline
? 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, ARCore, 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
29 reviews
  • 90%Jobs Completed
  • 96%On Budget
  • 100%On Time
  • 9%Repeat Hire Rate


Recent Reviews


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 [login to view URL] [login to view URL] 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


  • Preferred Freelancer Program SLA


  • Facebook Connected
  • Preferred Freelancer
  • Payment Verified
  • Phone Verified
  • Identity Verified
  • Email Verified

My Top Skills

Browse Similar Freelancers