json Freelancers

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json Job Cost Overview

Typical total cost of Upwork json projects based on completed and fixed-price jobs.

Upwork json Jobs Completed Quarterly

On average, 127 json projects are completed every quarter on Upwork.

127

Time to Complete Upwork json Jobs

Time needed to complete a json project on Upwork.

Average json Freelancer Feedback Score

json Upwork freelancers typically receive a client rating of 4.64.

4.64
Last updated: June 1, 2015
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  1. Wolfgang Herrmann

    Wolfgang Herrmann

    Super Mobile App Developer

    Germany - Last active: 2 days ago - Tests: 4 - Portfolio: 2

    I pursue the Best Quality. I will do best for your satisfaction. I have 6+ years of experiences in mobile app programming that include almost 100 projects. My skills: iOS, Android, Windows app programming cocos2d, box2d, OpenGL, Corona, Unity 3D Game Center, In-app purchase, RPG Server Chartboost, Revmob, Upsight, Adcolony, Applovin, Admob, Vungle, Flurry, mopub, Tapjoy Facebook, Twitter, Instagram, Youtube MySQL, SQLite, Oracle, ODBC Parse.com, Amazon S3, Twillio Chat and Message Engine Video/audio/image processing Video/audio streaming

    $33.33 /hr
    20 hours
    5.00
  2. Victoria A.

    Victoria A.

    iOS/Android app developer

    Sweden - Last active: 6 days ago - Tests: 9 - Portfolio: 3

    I am a developer with 4 years of experience in Objective-C/C/C++ and Android apps development 1 years of experience in versioning control tools, such as git. Depth knowledge in developing apps and SDKs. I love software and it is all of my life. Currently quite a little person is using iPhone and Android so IT industry is delveping constantly. Originally i am a professional in C/C++, but Nowadays I am interesting in mobile app development. During develoment, Skills and experience that i possessed is the following... -* iPhone/iPad app development (iOS 5.0~ iOS 8.1) * Social network integration(Facebook, Twitter, LinkedIn, Tumblr, etc) * Push notification, Local notification, Events, UrbanAirship * Web service integration (SOAP, REST, JSON, XML, XMLRPC), RSS, RestKit, AFNetworking, Socket.IO * CoreAudio , CoreAnimation, Audio/Video streaming * InAppPurchase, Paypal, E-commerce implementation. * Image processing, face detection, OpenCV, Augment Reality. * Bar code, QR code, ZBar reader and generator. * Ad network integration, iAD, RevMob, Google AdMob, TapJoy, Chartboost, AdColony, PlayHaven, AppLovin * Publishing apps to App Store.

    $35.00 /hr
    15 hours
    5.00
  3. Vladimir Homola

    Vladimir Homola

    Senior iOS & Android Developer

    Slovakia - Last active: 5 days ago - Tests: 7

    Over the last 5 years, I have developed a wide range of mobile apps using Objective C and Java for startup companies and small businesses. My core competency lies in complete end-end management of a new mobile development project, and I am seeking opportunities to build websites from the ground up for you or your business. I also have some experience in the following areas: PHP programming, Network-programming, Media Codec(AVFoundation, FFMpeg), OpenGL, Image-processing. Specializing following areas: + iOS SDK, iOS 4, 5, 6, 7 development(iPhone & iPad); + Android SDK, Android 2.3 - 4.2 development; + GPS, Google Map, Location Tracking + Cocos2D, Cocoa Touch, Unity3D, xCode, UIKit + C#, C++, Java, Objective-C + Front end and Back end for mobile services on PHP, .Net, Parse; + XMPP + Project management; + Startups development; + Business models generation. + HTML, XML, RSS Feed + Social Networking (Facebook, Twitter, LinkedIn) + I also use the most popular APIs like: Twitter API, Facebook API, Flickr API, Google API, Evernote API. + I am also Expert at Ajax, PHP, CMS- Joomla | Drupal | Wordpress + Ecommerce OsCommerce, virtuemart, + Databases: MySQL, MS SQL + Strong QA and Application Design skills. Thanks

    $49.00 /hr
    148 hours
    5.00
  4. Alin Barbu

    Alin Barbu

    Developing high quality native apps.

    Romania - Last active: 1 day ago - Tests: 2 - Portfolio: 3

    iOS Development | Android Development | UI/UX Design | QA Testing | Backend Solutions | Project Management | Bug Fixing | Porting Apps Between Platforms I am a full-service mobile developer and our mission is to help entrepreneurs and business owners expand their reach in the rapidly growing mobile marketplace. I have always worked towards putting together a solid team of experienced engineers, able to properly handle all aspects of development. From simple but intuitive principles to complex functions and backend coverage, I am always looking for our next big challenge. If youíre interested in starting a new mobile venture, then I am interested in hearing from you. I can provide: 1. Complex functionality I have a wealth of experience in both iOS and Android platforms: tell us what you want your app to do and weíll tell you how it can be done. 2. Integration with 3rd party APIs A lot of remarkable technology is already available which can be used to enhance the userís experience. I know how much this can improve an appís value and we never shy away from using the latest trending APIs. 3. Eye-catching designs I know how important it is for each app to have a unique and attractive look. That's why design is very important to us and our creative team has always come through in this regard. 4. Stability I will ensure the app is functioning properly and resists to stressful situations. 5. User-friendly, intuitive layouts I understand the importance of providing the user with a pleasant experience every time they access the app. This is another key focus that will always be covered in the design stage. 6. Feedback and consulting Having been in this business for a long time, we can provide our clients with thorough insights and qualified suggestions. I take a genuine interest in the apps we work on. You can always expect us to welcome questions and discuss the project together. 7. Quality Guaranteed Once an app is released, we provide a 6 Month Quality Guarantee. If any issues were to arise during that time which fall within the scope of the project, I will handle them free of charge. Our General Approach to Development: 1. Project breakdown Review the scope of the project; determine requirements and provide an approximate cost 2. Wireframing Create a visual representation of the project breakdown See example here: https://dl.dropboxusercontent.com/u/8542183/wireframe_example.png 3a. Graphic Design Decide color palettes, create layouts, icons etc (overall branding and design of the app) 3b. Web and Backend work At this stage, we also begin work on any 3rd party requirements the application might have. 4. Development We provide development builds and updates regularly (at least twice a week, but sometimes as often as every day) 5. Client Approval We work with the client until the app has been successfully released on the App Store. If needed, we can provide several small iterations for comparison. 6. Post-Production Support After release, we provide a 6 Month Quality Guarantee. If any issues were to arise during that time which fall within the scope of the project, our team will handle them.

    $33.33 /hr
    13 hours
    5.00
  5. Antti Lehkosuo

    Antti Lehkosuo

    Top iPhone | Android Developer(Objective C/Swift/Parse.com/JAVA/Web)

    Finland - Last active: 1 day ago - Tests: 8 - Portfolio: 5

    Hi, I am Antti. I have been working extensively on MAC OS X platform. I have worked extensively on the following technologies: - Mac OS X Development - Cocoa/Carbon Application Development - Cocoa Framework development (Frameworks for 3rd party apps) - Objective C/ Objective C 2.0/ C++ - iPhone Application Development - Delivered Cocoa/Objective C Trainings and discussions with different audiences. 

I have professional knowledge of development in most of iOS Frameworks: - UIKit - CoreData - CoreLocation - MapKit - MessageUI - AddressBook - SocialFramework.
 In terms of Android I am familiar with all components like Barcode, QRcode, GPS, Push Notification, Sqlite, Camera, Media and many more. I also have experience in the following areas: SQL, OOP, UI/UX, App Designing and Testing. I have good experience with API integration, Restful API, Paypal, Facebook, Twitter etc. providing robust, clean, well formatted and optimized code by passing all the bugs. FAST TIME, HIGH QUALITY Regards Antti

    $55.56 /hr
    171 hours
    5.00
  6. Denys Linkov

    Denys Linkov

    IOS and Android business app developer

    Canada - Last active: 1 day ago - Tests: 1

    HI! Over the last 3 years I have developed various applications ranging from games to productivity apps to business software. I have utilized a variety of platforms, including IOS, Android and Javascript to build full cycle apps. I have excellent interpersonal skills and enjoy working with people. I seeking to help you design, develop and test software solution for your needs.

    $15.00 /hr
    80 hours
    4.86
  7. Stefan Bowman

    Stefan Bowman

    PHP, web development and Multimedia

    Italy - Last active: 2 days ago - Tests: 5 - Portfolio: 10

    Since 1989 I have been an informatic teacher, qualified lecturer and freelance consultant for many school institutes and enterprises in Milan, Lodi and their surroundings, taking care of such issues as server side software programming, security and installation of Linux & SUN Solaris web and intranet servers. I’ve been Technical Product Manager in Digivision srl, Multimedia and software development lecturer for “CFP Canossa di Lodi” and SAE institute in Milan, recently I have been taking care of Value Added Services security and software development. Good English, French and Italian , written and spoken. I have a in depth knowledge of web sites and multimedia products authoring and programming, being also product manager for Digivision Srl about various audio and video digital compression technologies. I am an Internet software developer producing dynamic and interactive Web pages, search engines, e-commerce sites and web applications on UNIX, LINUX and Microsoft NT server, using PHP, ZEND FRAMEWORK, Mysql, Oracle, XML, JSON, Flash ActionScript, Director Lingo and others. Good level of APACHE, PHP, MYSQL, FTPD, SAMBA, NESSUS, TRIPWIRE, IPTABLES configuration and installation, set up of apache based reverse proxy in mod security for Linux and Solaris8

    $35.00 /hr
    432 hours
    5.00
  8. Zhang Tao

    Zhang Tao

    Senior IOS7/8 & Android Social Networking App developer

    Hong Kong - Last active: 1 day ago - Tests: 7 - Portfolio: 9

    ********* HONESTY + HIGH-QUALITY + FAST SPEED ********* I am a hardworking, results-driven, highly proficient IT professional with 6 years experience and a real passion for mobile application development. Readily embracing cutting-edge technology, I have gained an in-depth understanding of the main mobile platforms and recognize the subtle differences between each. Having helped develop a series of commercially successful apps on iOS, Android and Windows Mobile, I am seeking a new opportunity that will allow me to further expand on these skills. SOFTWARE SKILLS Experience with: 1) Development Platform: - MacOSX 10.8.2+ / XCode4.6+ / iOS5+ - Android SDK 2.2+ - Xamarin 2) Main Skills: - Chatting, Dating - Image Coloring, Captioning, Filtering, Camera & Gallery - OpenCV, OCR, Image Processing - Communication with backend-web server with JSON, XML - Apple Map, Google Map, GPS, Augmented Reality - Parse.com, UrbanAirship, QuickBlox, OpenTok, Twillio - QuartzCore, CoreData, OpenGL ES - Sqlite, Mysql - cocos 2d, ccos 2d-x, Mysql 3) Accessories - Game Center, In-App Purchase, Push notification - Social integrating with Facebook, Twitter, Google+, Youtube, Instagram - iAd, Adwirl, Admob, Revmob, Chartboost, TapJoy, Cerebro - Github, JIRA, bitbucket , Testflight, Dropbox - Bug sense, ACRA Thank you for your reading. Zhang

    $33.33 /hr
    25 hours
    5.00
  9. Vitaliy Adamchuk

    Vitaliy Adamchuk

    Senior iOS/Android Developer - Swift Expert

    Ukraine - Last active: 19 hours ago - Tests: 4 - Portfolio: 6

    I'm very professional mobile developer that have rich experience and deep knowledge of Software Engineering and Architectures. I love creation and innovation, treasure what i have created. Learning new technology or programming language is my passion. I delight in explaining complicated technical concepts to give my clients easy access to see what's going on "under the hood". I'm very amazing software engineer with 6+ years of experiences. I can provide you everything in my major programming area such as: 1. Mobile App Development -iOS/Android Social Media/Social Networking App -iOS/Android Chat/Messaging App -iOS/Android Video/Image Editing/Sharing App -iOS/Android Audio Editing App/Tool -iOS/Android GPS Tracking/Sharing App -iOS/Android Real Estate App/Business App -iOS/Android Taxi/Restaurant Service App -iOS/Android Medical/Fitness App -iOS/Android POS/eBay/eCommerce App ... ... ... 2.Web Development -RubyOnRails based WebSite -PHP, MySQL, Javascript, Html5, based WebSite -Wordpress, Magento, Ecommerce -SASS, MongoDB, Symfony, -Python/Django... ... .... ... 3. WebGL/OpenGL/GLSL -3D renering/modeling/mesh/geometry -Three.js, OpenGL ES, GLKit, GPUImage framework and other various 3D frameworks. .... .... ... 4. Mathematics, Physics ... ... ... I'm quite a fan of agile approaches for programming and I do the job in a very punctual and detail-oriented manner. I am always ready to chat via Skype or gmail in most of EST working time zone and would be happy to set up a convenient time to discuss the project you have in mind and your ideas. I am a result oriented person, fully dedicated to my work. I will provide you Top QUALITY product to you within your time deadline ALWAYS. I am also a person to be trusted, honest and reliable. I look forward to a long-term relationship based on trust, honest and HIGH QUALITY WORK. Please let's go for your project. Sincerely. Vitaliy Adamchuk. :)

    $80.00 /hr
    248 hours
    5.00
  10. Vasyl Popov

    Vasyl Popov

    Mobile(iOS, Android) and Mac Developer

    Ukraine - Last active: 19 hours ago - Tests: 6

    Over the last 5 years, I have strong experience in developing the iOS/Android and OS-X app/games as well as backend web service api. I also have deep knowledge and experiences in the following areas: SQL/SQLite databases, JSON libraries, Image Processing, Audio/Video Streaming, Social Network - Facebook, Twitter, Google API, Google Glass, and their integration with iOS applications. In the wide range of platforms, including iOS | iPhone | iPad, Android, I have developed 40+ apps/games available at Android Market and Apple Store. My Development Areas are as following ; ✔ iPhone, iPod, iPad, mac, Android, Web (iOS 6, 7, 8 and various os-x versions) ✔ objective-c, swift, java, c++, qt, cocoa, cocoa-touch, openGL ✔ Cocos2D, Box2D, Corona, PhoneGap, Sencha-touch, Unity3D. ✔ Social Media - Facebook, Twitter, Google+, Instagram ✔ Google Map Service, Apple Map Service, Foursquare, Geo Location ✔ CoreData, CoreGraphics, Animation ✔ Web Service, Ajax, XML, JSON, RSS, SOAP, WSDL ✔ PHP, MySQL, SQLite, HTML, HTML5, JavaScript ✔ Live Stream Video/Audio. Regards. Vasyl.

    $39.99 /hr
    310 hours
    5.00