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On average, 122 json projects are completed every quarter on Upwork.


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json Upwork freelancers typically receive a client rating of 4.67.

Last updated: September 1, 2015
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  1. Chamroeun Chan

    Chamroeun Chan

    Web developer

    Cambodia - Tests: 1 - Portfolio: 1

    I 've spent over 2yrs on web development from small company site to business sites using my skill PHP, Wordpress, Bootstrap, Jquery, Html5, CSS3 and such other language and framework that help boost up my work. I 'd put my client in front line to meet their requirement and need, and I commit to achieve the positive feedback from client. Give me a try, you may feel what I 'm struggling.

    $11.99 /hr
    0 hours
  2. Kyrylo Andreiev

    Kyrylo Andreiev

    iOS App Developer

    Ukraine - Tests: 3 - Portfolio: 9

    Skilled iOS software developer from Ukraine. My overall experience is more than 4 years of creating and improving mobile apps. Using such technologies as client-server communication, multithreading, SQLite and CoreData databases, custom designed views with animation, navigation and maps, and much more. Also trying myself in making games with SprikeKit framework. Always provide professional and carefull approach to creating apps.

    $22.22 /hr
    0 hours
  3. Satyakam Parikh

    Satyakam Parikh

    A Rubyist.

    India - Portfolio: 1

    I am a Rubyist. I make RailsApps not the App that uses Rails. I like to face challenges that broaden my horizons and improve my knowledge. I have worked on 6 projects so far which also includes mobile API(json) using Rails, AJAX, JavaScript, jQuery, TDD+BDD and I am eager to add more. I would be willing to work on any type of development you prefer: test driven development, or extreme programming, scrum/agile or guess clients wishes.

    $18.00 /hr
    0 hours
  4. Veiko Herne

    Veiko Herne

    Over 30 years of programming experience...


    Over 30 years of IT experience, being winner of world championship of programming in 1995. Besides SEO work, I have past years mainly coded to iOS (Objective-C, but also Swift), but I have good experiences building backends with php/MySql and integrating those with websites (HTML,XML,JSON,Javascript,jQuery). Familiar with lot of APIs, Facebook SDK, Parse, PayPal SDK, etc. My personal hobby since my first employment to Soviet Union Science Academy is still to program complex algorithms mostly in C.

    $10.00 /hr
    0 hours
  5. Cristian Sora

    Cristian Sora

    .NET Web & Desktop Developer

    Romania - Tests: 2

    Project types: Windows Forms, Console, Class Libraries, Windows Services, ASP.NET Web applications, ASP.NET Web Services, ASP.NET Server controls, SharePoint, Dynamics CRM integration. Programming languages: C#. Platforms: .NET Framework 2.0+, ASP.NET 2.0+, Office Sharepoint Server 2007+, Microsoft Dynamics CRM 4.0+ (beginner). Web Servers: IIS 6+. Scripting: JavaScript, jQuery, HTML, XML, AJAX. Databases: SQL Server 2005+, SQL Server CE, MS Access, MySQL Server. Tools: Visual Studio 2005+, SQL Server Management Studio 2005+, MS Team Foundation Server, SVN Server, Tortoise SVN, MySQL Workbench.

    $22.22 /hr
    0 hours
  6. bent jensen

    bent jensen

    Senior iOS mobile

    Denmark - Tests: 3 - Portfolio: 2

    I am from Copenhagen, Denmark. I have been working for iOS and android mobile apps for more than 6 years with a proven track record of completed projects on time and exceeding clients satisfaction. To archive this course, I was responsible for bringing several high profile apps on itunes and google play store and app store. I am a quality and speed oriented developer, so fully dedicate to work and also honest and reliable to the contracts with clients , as well as I don't need to be trained. I am working in this upwork site to bring your ideas and vision to mobile marketing place with success and useful to human life. And I have a lot of experiences in app building from scratch. During the recent months, I have published iOS 8 apps to app store and they all has attractive designs and good reviews and lots of users are using currently. I have follow skills. - Native iOS and Android - Web service : XML/JSON, REST/SOAP - Cloud backend :, QuickBlox, AWS, FireBase, Foodie, Twillio, Plivio - Video/Image/Audio processing : OpenCV, GPU Image, Aviary api, Tesseract api, CoreAudio, AVFoundation - Location Service : GoogleMap, Foursquare, GPS, StreetMaps, - Social Media : Facebook, Google+, Instagram, Twitter, - Online payment Gateway processing : PayPal, Stripe, Venmo, ApplePay - iAd, Adwirl, Revmob, Admob, Chartboost, Flurry I have developed so many apps and I have good sense of mobile apps. - Social networking App, Dating App, Messaging App, Shopping App, Booking App, Taxi App, Event App, Video&Audio App, Youtube App, Barcode and QRCode Scanning App, Entertainment App, Sports Event App, Health&Fitness App and other office use and home use apps. I have been working with clients who are located in US, and my working time is used to US. I can work full time in whole day and dedicate 45+ hours in a week. And I am almost available in skype calling, so any clients can contact me with ease and any time. I like to work with long term relation ship. HIRE ME!, THEN YOU WILL SEE YOUR PERFECT APP WITH GOOD MONEY. HIGH CODING SKILLS AND VISION OF LAYOUT AND ATTRACTIVE DESIGN WILL MAKE YOUR APP PERFECTLY. Thanks for reading. Best Regards. Bent J.

    $44.44 /hr
    2 hours
  7. Omar D.

    Omar D.

    iOS/Android + Swift + iBeacon/BLE/WatchKit Expert

    Ukraine - Tests: 5 - Portfolio: 3

    ****************** Welcome to my profile ********************* All projects are developed in MVC(Spring) and MVVM, Agile Methodology. Developed new and existing iOS applications. Partnered with designers to help define and implement User Interface. Worked with team members on server-side integration. Ensured to build an iOS applications that can be widely accepted. Skill set: - Apple Watch App(WatchKit, Xcode6.2), Swift, UIStoryboard, AutoLayout, OpenEars. - Pubnub, CocoaLumberjack, SpriteKit, OCR, Google Analytics, Stripe, - Develop innovative mobile solutions with iPhone/iPad/Android/, Objective-C, Java, Ruby, REST, Objective Cloud Services and virtualization - 7 years of iPhone/iPad/Android Development Experience Technical - Proficient in Object oriented programming in Objective-C & iPhone SDK 4.0 - Proficient in Java 6, Object Oriented Design, and Design Patterns : MVC, MVVM - Proficient in Mac OS X, Centos, Windows - Expert with over 7 years experience of full Mobile Software Development Life Cycle gathering Recommendations: - Communicate early, communicate often - Provide honest and realistic project updates through Testflight, Diawi, Github, Bitbucket, Jira, PivotalTracker, Crittercism, MixPanel, etc - Respond quickly and hit deadlines - Listen to the client's concerns and have a positive attitude

    $50.00 /hr
    0 hours
  8. Jaroslav Popova

    Jaroslav Popova

    Senior Mobile Developer(iOS, iPhone, Android App) with web back-end

    Czech Republic - Tests: 7 - Portfolio: 10

    I'm Jaroslav. - I'm a senior mobile (iPhone, iPad, Android) developer with extensive experience in building high quality sites. Also I consider myself very ambitious, competitive, hard working, and reliable. I have the ability to look at the small details and form a fairly accurate, big picture. - I'm competitive, driven, and creative. My experiences range from creating MOBILE APP with BACK-END for You. I like working on projects with you that cares about creating beautiful and usable interfaces. It's important to me to build long term relationships with clients, so I'm primarily looking for long term projects. I'm flexible with my working hours and am happy to work closely with any existing freelancers you work with. Impossible is nothing and that is my motto in life. My Main Skill and experience - Business App - Social Integration ( Facebook, Twitter ..) - Social Networking App - Books App - Health & Fitness App - News App - Amazon, Parse ( Back-end) - PHP, code igniter, JSON, jQuery - GPS, Geo-Location Base - Push notification, In App Purchase

    $54.00 /hr
    2 hours
  9. Stuart B

    Stuart B

    Android Mobile Application\Game Developer

    India - Portfolio: 4

    I have experience more than 3 years in application\games development and delivered around more than 15+ builds to the Google play store. Major Skills: Android SDK-NDK , Google APIs , GCM , Maps , Geolocations , Web Services(REST & SOAP) , JSON , XML , 3rd Party Libraries , Facebook , Google+ , Twitter etc Integration , Custom dynamic UI designs. Major Projects : LabyRinth 3D : Amber Alerts Teen: USC GameDay: Project Trojan: Fruit Slash:

    $15.00 /hr
    2 hours
  10. Alex Kimura

    Alex Kimura

    Top Mobile Developer (iOS, Android, PhoneGap)

    Japan - Tests: 10 - Portfolio: 8

    You think you have a brilliant app idea? Contact me. Not only magical skill to make it real, but also able to help you improve on your initial vision. Together, we can change the way the world breathes!!! Here's what you can expect from me, Multimedia - Capturing and displaying of pictures - Capturing and playing back Audio and Video Look and Feel: - Good looking user interface which is Apple’s Human Interface Guidelines compliant - UIKit based Animations to provide fun and engaging user experience - Orientation support and iPad specific interface customizations - Displaying of Maps to provide visual geographic context to your apps - Displaying charts and graphs to show trends or statistics - PDF and HTML rendering - Custom drawing Business Logic: - Persistent storage for database driven apps (a mini-db within the iOS app for offline work) - User login/register and data download and upload using webservices - Server push notifications to keep your users up to date - Location detection and related tasks - Enabling apps to run in background - Use of multiple-threads to keep user interface responsive - Robust validation and error handling to minimize bugs and crashes - Integration with RSS news feeds - Synchronization of local data with remote data - Barcode and QRCode scanning - Sending emails, SMS, or making phone calls Social networks for user login or content sharing - Facebook integration - Twitter integration - Linkedin integration Monetization - In-app purchase integration - Integration of advertising networks (eg. iAd, Admob, Adhwirl) - Integration with third-party payment processing systems Bluetooth support - Interfacing with external devices via Bluetooth communication Third party SDKs and web-services/APIs - Image editing/effects using Aviary SDK - Remote crash reporting using - Scalable file storage using Amazon’s AWS S3 - Application usage analytics using - Goole Places to lookup business around a location - Google Maps for navigation - Sending SMS via server using Twillio - Payment processing using Stripe and Paypal - Data sync using iCloud and - for scalable db/back-end platform Value-added services - Full support in setting up apps to be distributed via Apple’s iTunes store - Feedback and expert opinion to improve the usability of the apps - Beta version provisioning for client testing and milestones verification I have below mobile devices. - iPhone 6, iPhone 4S, iPod5, iPad 2, iPad Air. - Samsung Galaxy (4.0.3, 4.1.4). Thanks.

    $33.33 /hr
    0 hours