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: 11 hours 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
    284 hours
    4.80
  2. David B.

    David B.

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

    Netherlands - Last active: 11 hours 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
  3. Stefano A.

    Stefano A.

    Senior Mobile App (iOS & Android) Developer

    Portugal - Last active: 11 hours 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
  4. Fabian Bigos

    Fabian Bigos

    Mobile & Web Developer

    Poland - Last active: 19 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
  5. Wolfgang Herrmann

    Wolfgang Herrmann

    Super Mobile App Developer

    Germany - Last active: 1 day 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: 9 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. Johanne Hansen

    Johanne Hansen

    iOS & Social & XMPP Professional

    Norway - Last active: 15 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
  8. Vasyl Popov

    Vasyl Popov

    Mobile(iOS, Android) and Mac Developer

    Ukraine - Last active: 11 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
  9. 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
    11 hours
    5.00