Jack S.
Drop Here

Jack S.

Top Mobile Developer | Development Addict


Beijing, China


Always welcome a new challenge, so feel free to send something my way. No matter the project, I can surely handle it. - 10+ years software development experience - Track record of designing and executing successful app development - Experience communicating with both internal and external developers and client - Action oriented with a proven ability to work in rapidly-changing environment - Excellent interpersonal skills; the ability to work effectively with all levels of a firm - Extensive experience working with international resources Available programming languages and frameworks for me; * Objective C/xCode, iOS6, iPhone SDK, iPod, iPad,Cocoa, Cocoa-Touch * Super level UI customization, ... moresuggestion of best user friendly * Google Map Service, Foursquare, Apple Map API, MapKit, Geolocation, GPS * Social Networking Integration, Social sharing, Community, Facebook, Twitter * Photo processing, filtering and effect * Video/Audio Streaming and Processing, Pattern recognition. * ePayment, In App Purchase, Paypal, Fashion, IAP, E-commerce, Commerce * OpenGL ES, OpenCV, Animation, CoreGraphics, GPUImageFramework * Web services, HTTP, JSON, XML, RSS, SOAP, PHP, HTML, HTML5 * SQLite and MySQL database * Facebook, Twitter, Youtube, Tumblr, Flickr, Instagram, Google plus * Push Notification and Local Notification, Calendar, Alarm, Reminder * Business analysis system like Flurry, rich experience of POS mobile app development * Source Repository, Testflight, Github, SVN, BitBucket Platforms; -iOS(iPhone/iPad) -Android/Tablet -Web Service(Backend/Admin Tool) -Windows Mobile Free Consultation & Quote I offer a Free Consultation and Quotation Service that has no obligation attached. Please be free to get in touch for more information. Please do fill all the relevant fields in the form and we will to get back to you as soon as possible. My resume is constantly changing, making it difficult for me to keep it up to date on here. Feel free to contact me for any specific examples you want of my work less

Jack S. has added 11 portfolio pieces. Create an account to review them.

Work History and Feedback

  • May 2013 - Jun 2013

    App Developer
    Jack is a fantastic contractor. I will work with him again. He is honest and easy to communicate with.
    106 hours
    $33.33 / hr
    $3,532.98 earned

  • May 2013

    App Developer
    Jack is a pleasure to deal with, fast to respond, honest and always available. I would gladly use him again for upcoming projects.
    $833.33 earned
    Fixed Price

  • Apr 2013 - May 2013

    Android USB Conection App
    Jack quickly develop an application for me that performed directly as needed. The application was complex and his understanding of android is excellent. His communication was great and I will definitely use him in the future.
    10 hours
    $33.33 / hr
    $333.30 earned

  • Apr 2013

    Reverse Engineering Android Application
    it was nice working with you.
    2 hours
    $33.33 / hr
    $72.22 earned

  • Feb 2013

    Mobile Developer
    Good developer for my project, did all the work properly, will definitely use again for mobile project.
    120 hours
    $33.33 / hr
    $3,993.94 earned

Jack S. has more jobs to show. Create an account to review them.


Name Score (out of 5) Time to Complete
Facebook Connect Test 4.60 Top 10% 21 mins
Java Test 4.50 Top 10% 22 mins
Google Android Programming Test 4.50 Top 10% 26 mins
JSON Test 4.75 Top 30% 14 mins
Programming with C++ Test 4.10 Top 10% 24 mins
Cocoa programming for Mac OS X 10.5 Test 4.60 Below Average 17 mins
Objective C Test 4.40 Top 30% 14 mins
U.S. English Basic Skills Test 4.90 Top 10% 14 mins
iPhone Programming OS 4.0 Test 4.60 Above Average 19 mins