Profile image of keiespro
Flag of China Yanji, China
Member since June 27, 2011
1 Recommendations


Online Offline
Greetings of the day! Senior Mobile & Web developer here with 6+ years of development experience in providing high quality products and extensive services to my customers. What I have always been assured to my clients for the last 6 years is Quality, and I have modeled my work philosophy around Henry Ford's quote "QUALITY MEANS DOING IT RIGHT WHEN NO ONE IS LOOKING". [I am experienced in ] : - iOS, Android Native development (Objective-C, Swift, Java) - Hybrid app development (Ionic, Xamarin, React Native) - Mobile Game Development (Unity, Cocos2d, Unreal Engine) - Website Development (Node.js, Angular.js, Python, Ruby) - Ecommerce Platform Development (Shopify, Woocommerce) - Consulting for mobile app & website development - Technical Documentation & Project Management All those who succeeded know that it can make or break your business depending on whether you have a reliable technical partner who always delivers the perfect results to you. I am always ready here for you!
$38 USD/hr
139 reviews
  • 88%Jobs Completed
  • 100%On Budget
  • 100%On Time
  • 24%Repeat Hire Rate


Recent Reviews

  • image of Valentin J. Looking for an iOS Guru for source code review $444.00 USD

    “Great Developer to work with! She performed the task super fast and with perfect quality. Yong is a real diamond in the rough. I am glad that I have found her and will definitely hire her for my next projects. Thank you, Yong!”

  • image of solutionmanager1 Build v2 of existing app $111.00 USD

    “It was a great experience in upwork. Top quality, responsivenss and trustworthy.”

  • image of joshmarketing Permanent Projects with Keiespro $1750.00 USD

    “I really miss this guy, one of the best I have ever worked with. Hope you are doing well wherever you are.”

  • image of Salatiel A. Pumping Cooper-Jacob $350.00 USD

    “He fulfilled what he promised and on time. I strongly recommend this professional.”

  • image of Salatiel A. Citacoes - Facebook $250.00 USD

    “Great developer, delivered on time and with quality.”

  • image of Salatiel A. Tree licensing $75.00 USD

    “Excellent programmer. Always on time with quality and strength!”


Website consultant

Jan 2006 - Dec 2011 (5 years)

I worked for this company for 6 years and got a lot of experience.


Bachelor of Enginerring

2001 - 2005 (4 years)


BEC Higher (2007)

National university.

I've achieved BEC Higher in 2007.


  • PHP Level 1
  • C++ Level 1
  • US English Level 2
  • UK English 1
  • C 2
  • HTML Level 1
  • Java Level 1


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