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. Csaba Toth

    Csaba Toth

    High-Skilled Mobile Developer for IOS & Android

    Hungary - Last active: 1 day ago - Tests: 9 - Portfolio: 11

    Hello *****Best Quality and Fast Speed******* I am Csaba Toth, a talented Mobile application developer. I have a good experience of Mobile application and games. Also, I have developed a lot of Desktop applications and web development. Mobile device platform: - iPhone 6 plus, iPhone 6, iPhone 5s, iPhone5, iPhone4s - iPad Air, iPad4, iPad3, iPad mini - Google Nexus 5, Samsung Galaxy S5, S4, S3, HTC One My skill-set: - Native: iOS, Android, Windows8 (Objective-C, Swift, Java, C#), JNI, NDK (C/C++) - Hybrid: PhoneGap, Xamarin, Titanium (HTML5, jQuery Mobile, C#) - Web service: XML/JSON, REST/SOAP - Cloud backend: Parse.com, Parse SDK, Parse REST, Parse Cloud Code, Amazon S3 EC2 AWS, Firebase, Twillio, Plivio - Chat & Messaging Engine: XMPP, Jabber, OpenFire, OpenTok WebRTC, Ejabberd, Erlang - Video/audio/image processing: OpenCV, GPU Image, CoreAudio, EZAudio, Pitch Control, Bass, AVFoundation - Video/audio streaming, codec: Wowza, Red5, H.323, MPEG-4 - VOIP, Cloud Communication: Twillio, Heroku, Tokbox - HTML5, PHP, ASP, JSP, C# and their frameworks - MySQL, SQLite, Oracle, SQL Server, ODBC - Facebook, Twitter, Linkedin, Instagram, Dropbox, Youtube, Pinterest, Vimeo - Google Map, Foursquare, Geolocation, GPS, Open Street Maps - Cocos2D, OpenGL, Corona, Unity3D, Box2D - Game Center, In-App Purchase, RPG server - iAd, Adwirl, Revmob, Admob, Chartboost, Tapjoy, Flurry, Testflight - Cloud services: Parse.com, iCloud, Rackspace, Zoho CRM, Salesforce, Azure, AWS, EC2, Dropbox

    Groups: Application Developers Alliance

    $44.44 /hr
    288 hours
    4.80
  2. Stefano A.

    Stefano A.

    Senior Mobile App (iOS & Android) Developer

    Portugal - Last active: 1 day ago - Tests: 13 - Portfolio: 11

    Over the last 8 years, I have developed so many iPhone, iPad, Android apps including social networking app, dating app, chat app, shopping app, fitness app, video/photo app, games and etc... I mastered all parts of mobile technologies & skills with lots of experiences. And I have rich experiences in web-backend * web-apis development for mobile apps. I have an extensive knowledge of ObjectiveC/Java/C#/Ionic-AngularJS languages, broad experience in a number of professional products such as mobile apps, cross platforms solutions, embedded systems, networking and multithreading solutions, algorithm development. Mobile device platform: ✔ iPhone 6 plus, iPhone 6, iPhone 5s, iPhone5, iPhone4s ✔ iPad Air, iPad4, iPad3, iPad mini ✔ Google Nexus 5, Samsung Galaxy S5, S4, S3, HTC My skill-set: ✔ Native: iOS, Android (Objective-C, Swift, Java), JNI, NDK (C/C++) ✔ Hybrid: Xamarin (C#), Phonegap Cordova(Ionic, AngularJS) ✔ Web service: XML/JSON, REST/SOAP ✔ Web development: PHP MVC frameworks, MySQL, CodeIgniter ✔ Cloud backend: Parse, Amazon, Firebase, Foodie, Twillio, Plivio ✔ iAd, Adwirl, Revmob, Admob, Chartboost, Tapjoy, Flurry, Testflight ✔ Facebook, Twitter, Linkedin, Instagram, Youtube, Pinterest, Vimeo ✔ Google Map, Foursquare, Geolocation, GPS, Open Street Maps ✔ Chat & Messaging Engine: XMPP, OpenTok ✔ Video/audio/image processing: OpenCV, Pitch Control ✔ Cloud Communication: Twillio, Tokbox ✔ Speech recognition, text-to-speech, Siri, OpenEar ✔ MySQL, SQLite, Oracle, SQL Server, ODBC ✔ In-App Purchase ✔ JIRA, Github, BitBucket, SVN, GitLab ✔ Cloud services: iCloud, AWS, EC2, Dropbox ✔ Online Payment Gateway: PayPal, Stripe, Braintree I’m looking for long-term business relationships with customers.

    $66.67 /hr
    116 hours
    5.00
  3. David B.

    David B.

    Senior Mobile App (iOS/Android) & Server Back-end Developer

    Netherlands - Last active: 1 day ago - Tests: 17 - Portfolio: 16

    *** Your Journey into Native Mobile App Development (iOS/Android) starts with me *** Full-Stack Native Mobile Apps & Web Services Expert Full Time support(40~60 hrs/week), Daily progress report & Skype live chat Long-term relationship contract & Money-back guarantee *** iOS/Android Application Development *** - iOS Native (XCode): Objective-C, Swift, Cocoa Touch, iOS7 & iOS8 Kitkat - Android Native (Studio/Eclipse): Java - Hybrid Apps: Phonegap by Ionic (Angular JS), Cordova SDKs, JQM, Kendo UI - Xamarin (.NET) - Mobile Games: Cocos2D, Cocos2DX, Unity3D, Board SDK *** Mobile Application Services Support *** - Analytics and Testing : Google Analytics, Apptentive, Flurry, KIF testing framework - Back-End: JSON-RESTful APIs built on PHP MVC Frameworks for CRUD as well as 3rd Party SDK integration like Parse, Twillio - Services: Cloud, iBeacon, FB, Twitter, LinkedIn, Twitter, Google, Audio/Video (Wowza) Streaming *** Web Services Support *** - Main Tools: PHP, MYSQL, HTML5, DHTML, JQuery, CSS3 (Bootstrap & Responsive & Parallax) - JS Templates: AngularJS(Ionic), BackboneJS, NodeJS(XMPP), RequireJS - Common Templates: WP, Joomla and PHP MVC frameworks : CodeIgniter, Laravel, CakePHP, Yii and Kohana - Ecommerce: Magento, OpenCart, WooCommerce, Shopify and Prestashop I work as individual, supporting full time. I'm here to analyze your ideas and requirements and offer our vision of project realization. Rough quote will be ready within 48h. If it is acceptable for you, I'll prepare detailed project development plan indicating timeline and budget. I always make sure to bring you upon successive results of highly and creatively qualified results before your deadline and guarantees refunding for any unsuccessful results or issues which are responsible for me. I am seeking an opportunity to become a business partner with long-term relationship forever.

    Groups: Application Developers Alliance

    $70.00 /hr
    495 hours
    5.00
  4. Andreas Braun

    Andreas Braun

    Frontend | Ruby on Rails | WordPress | MVC Expert

    Germany - Last active: 9 days ago - Tests: 10 - Portfolio: 7

    Hi, I am a senior web developer with 6+ years experience. I have developed a wide range of websites. I am always trying to deliver high quality solutions before deadline. I have strong skills and good experience in the following areas. - Ruby - Ruby on Rails Refinery CMS, Spree RSpec,Cucumber,TDD,BDD Various Ruby Gems, - PHP ( OOP ) MVC : CodeIgniter, Zend, Laravel CMS : WordPress ( Theme development & customization, Plugin modification ) - Front-End: HTML/CSS, JavaScript, Ajax, Coffeescript, JS Framework: AngularJS, D3JS, NodeJS, HAML, - Database: SQLite, MySQL, PostgreSQL, MongoDB I am looking forward to work with you!! Thanks for your time and consideration.

    $40.00 /hr
    16 hours
    5.00
  5. 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
  6. Amit Kumar

    Amit Kumar

    ASP.NET and MVC Software Engineer

    India - Last active: 10 days ago - Portfolio: 2

    Over the last 4+ years, I have developed a wide range of websites using HTML, .NET /mvc, using sql server 2008/2012 in C# ,VB and PHP using my-sql including sites for startup companies and small businesses. My core competency lies in complete end-management of a new website development project, and I am seeking opportunities to build websites from the ground up for you or your business. I also have great experience in the following areas: - Javascript/ Jquery/ Ajax & jQuery, jQuery UI - HTML/ XHTML/ CSS - JSON/ XML - MS SQL server 2005, 2008,2012 - Visual Studio 2.0/ 3.0/ 3.5/ 4.0/5.0 – ASP.NET/ VB/ C# - .MVC 2.0/ 3.0/ 4.0/5.0 Razor - Web services, LINQ - Entity Framework - APIs (Twitter, Facebook, Google+, Instagram, LinkedIn,Long Tail) - Core PHP - My SQL Server -Kendo UI -Telerik .NET UI Controls -SVN/TFS

    $11.00 /hr
    24 hours
    5.00
  7. Frederic Bonnet

    Frederic Bonnet

    France - Last active: 10 days ago

    Better call Fred. I code therefore I am. I wrote my first program when I was 12. It was on a 16-kB Sinclair ZX-81 plugged on the living room TV. Ah, memories. Professional R&D engineer since I'm 23. Now I am 41. After all these years I think I can program just about anything, from back office to end user GUIs. I especially like algorithmic stuff (I have a research background in CS and computational geometry) and system-level C. But while implementation is only the final stage, design is the most important part in a project. I've been a senior software architect for some years now, so I can help you besides mere coding tasks (e.g. refactoring existing codebases). I also enjoy data mining and analysis. I'm fluent in English but my native language is French, so if you also have translation jobs that involve technical knowledge then I can help as well. I routinely write technical documentation for my daytime job in the telco industry (specifications, design, operation manuals, etc).

    $25.00 /hr
    22 hours
    5.00
  8. Johanne Hansen

    Johanne Hansen

    iOS & Social & XMPP Professional

    Norway - Last active: 16 days ago - Tests: 9 - Portfolio: 1

    " Quality Service within deadline " I've got more than 9 years in IT. I've learned professional education and have got plenty experience. Especially I'm an expert in iOS development, social platforms' api, XMPP and WebRTC. My key skills and abilities include + iOS programming languages (X-code, Swift, Objective-C) + iOS SDK (Foundation, UIKit, Core Data,AVFoundation, MoviePlayer,Quartz Core,Core Animation, etc) + Various social platform and their api including Facebook, instagram, twitter, etc. + Text messaging and video/voice chatting - XMPP, OpenTok, Pusher, APN + Networking framework - AFNetworking, Web RTC, Socket.io TCP/IP + Map integration(GPS Location) / Google Map API, MapKit Framework + e-Commerce payment system - Paypal, Authorize.net, Stripe, Saleforce, card.io + ad serving or ad network SDKs (iAds, Google admob, etc) + Web service develop and integrating - JSON RESTful API, Parse.com, Node.js, Ruby, Mean + Various library development using C/C++ + Team Work - SVN, GitHub, Bitbucket

    $50.00 /hr
    10 hours
    5.00
  9. Fabian Bigos

    Fabian Bigos

    Mobile & Web Developer

    Poland - Last active: 20 days ago - Tests: 10

    Hello I am working in Mobile and Web fields for several years. I have developed a various of kind of iOS/Android apps and web sites for clients and business company. So I have confidence about my work. From basic objective c, java, php to API, SDK, Library, I have enough experience and good solution in using and integrating for several purpose. - Programming language ; objective-c, swift , java, html5, css, js, jQuery Mobile, c# - Development tool & framework ; Xcode 6, Eclipse, Android studio, Xamarin, Titanium, PhoneGap/Cordova - Backend development; Web services and Cloud services such as Parse, Firebase, AWS,Dropbox - Source Control; BitBucket, GitHub, GitLab, JIRA, SVN - AD; AdMob, MoPub, RevMob - Apple Service and Google Service - Social Apis; Facebook, Twitter, Instagram, Youtube, Vimeo - Video/Audo/Image processing: OpenCV, GPU Image, Face Detection, Voice Recognition - Geolocation & Map; Mapkit, Google map SDk, Mapbox - Database; MySQL, SQLite, NSCoding, Core Data - Wireframe and Mockup 2.Web Area - Backend, Frontend development - UI design, Database design - JS, PHP frameworks I will do my best to give you a full satisfaction. Thank you

    $40.00 /hr
    24 hours
    5.00