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, 126 json projects are completed every quarter on Upwork.

126

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 4.65.

4.65
Last updated: May 1, 2015
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  1. Martin Müller

    Martin Müller

    Top iOS 7,8, Swift, Android, iBeacon Developer

    Germany - Last active: 3 days ago - Tests: 10

    Hi. I have 6 years experience developing mobile applications using Objective-C, and lately using the SWIFT(6.0 ~ 8.2) programming language. My core competency is in mobile applications especially iOS Development and Android development. I managed to finish projects both on teams and independently. I like challenging projects where I get to learn new things. My key skills and abilities include (NOT limited to) - Eye candy mobile UI & UX, Storyboard, Swift - Backend development - core php, Zend, CakePhp, WordPress, Magento, RoR, Heroku, Amazon Web Service - Text messaging and video group chatting - XMPP, OpenTok, Pusher, APN, ooVoo, Zingaya, Twilio - Integration with - HealthKit, CloudKit, HomeKit, AirPrint - Networking framework - AFNetworking, Web RTC, Socket.io TCP/IP - Motion Tracking - CMStepCounter - GPS - Core Location, MapKit, MapBox, GooglMap - e-Commerce payment system - Paypal, Authorize.net, Stripe, Saleforce, card.io - Media manipulation - CoreAudio, CoreVideo, AVFoundation, CoreGraphics - Data and Graph visualization - Core Plot, iOSPlot, JBChartView - Web service integrating - JSON RESTful API, Parse.com - Social integrating - Facebook, Twitter, Pinterest, Tumblr, Google+ - Online buy/sell Marketing/Shopping business App - Online Chatting/Messaging/Dating App - Push Notification (APNS, GCM) - Good team play - Git, Bitbucket, Trello, Jira, PivotalTracker, axosoft I am always available to chat via Skype or mail in most of EST working times and would be happy to set up a convenient time to discuss the project you have in mind and your ideas. My portfolio contains a few examples of my most recent work and many more examples can be provided of different types and styles of apps for both iPhone iPad and Android. I have a 100% satisfaction guarantee and 100% positive feedback from all my clients so if you have a great idea, then contact me, I am sure I will be able to help you. If you hire me for one project, you will hire me again and again in future and you will come to know that your choice was right. ---------- I look forward to a long term relationship based on trust. -------------- Thanks

    $39.99 /hr
    75 hours
    5.00
  2. Ulrik Damm

    Ulrik Damm

    Solid iPhone/iPad/iWatch/iMac App Expert

    Denmark - Last active: 20 days ago - Tests: 4

    I have rich experience in the development of iOS and android. If you are looking for a highly skilled iOS & Android development expert with depth of knowledge, professional attitude, excellent communication and the highest code quality, I am right person you are looking for. http://ufd.dk http://robo.cat On the development side of things, I am fastidious and passionate. All of my work is delivered ahead of scheduled and is crafted with the utmost quality. If you work with me you can get excellent results for short time. I will satisfy your need with my skill. I love working with you.

    $38.89 /hr
    40 hours
    5.00
  3. Antti Lehkosuo

    Antti Lehkosuo

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

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

    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
    131 hours
    5.00
  4. Vladimir Homola

    Vladimir Homola

    Senior iOS & Android Developer

    Slovakia - Last active: 1 day 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
    106 hours
    5.00
  5. Anupam Gupta

    Anupam Gupta

    Expert PHP Web Application Developer

    India - Last active: less than one minute ago

    I'm a freelance web application developer working for several clients all around the world. Few projects: - RadioInfo.ca (work in progress..) - Archdiocese of Philadelphia" (http://www.archphila.org) - Backend pension management system - MyDittoLog.com - Portal for Pilots and Club admins to log/manage flight details and create reports, invoices - Janus Worldwide - Event and Interpreter Schedule Management System (int.janusww.com) - ARBScan.com - Web trading APP equipped with scanners to retrieve data from Yahoo/Edodata finance APIs - EZWantads.com (http://www.ezwantads.com/ads/) - FinderTag.com FinderTags For Automobiles, Keychains and Dog Collars - WorkOptional.com SOAP based process integration, active timelines - OrderChecksDirect.com (http://www.orderchecksdirect.com) - LicenceLocker.com (http://www.licencelocker.com/sys/) - hot100tips.com (http://www.hot100tips.com) - Meatbids.com (http://www.meatbids.com) etc.

    $15.00 /hr
    138 hours
    4.90
  6. Olli T.

    Olli T.

    Seasoned iOS, Android App Developer with Strong Backend Skills

    Finland - Last active: 2 days ago - Tests: 8

    I'm an experienced mobile developer in Turku, Finland. I can help you launch a successful app including: - Clarifying requirements, designs, and technical options to meet your project goals. - Developing your application - screen by screen - to meet your requirements and user needs with solid code using Apple and Google's latest tools. - Testing, packaging, and support of your application including App Store publishing with Apple and/or Google. I develop apps using native languages (Objective-C, Swift, xcode) and hybrid technologies (Ionic, PhoneGap/Cordova, Angular, Node/MEAN). The best approach depends on the requirements. Happy to chat about tech in more detail and discuss what's possible on iPhone, Android, and web-based platforms. As a freelance mobile developer, I help my clients turn their ideas into beautiful apps for iPhone, Android, and web-based users. Depending on your needs, I can tackle your project as a solo developer or I can bring along other team members if you need an extra level of design polish, or if you have a tight timeline. I suggest a two phase approach for most projects: 1) Design Phase: We work together to sketch out how your app will work including the user experience, technology, and project goals. 2) Delivery Phase: We develop, test, and launch your app based on the requirements and features in the Design Phase. I'm a full-time freelancer so you'll have direct access to me by Skype and cell during business hours and most evenings. I'm new to oDesk but have 5 years experience as a freelancer, and over 15 years experience in custom software projects. Here's where I can help: - Mobile app design, requirements clarification, etc. - Mobile programming of native apps for iPhone, iPad, and Apple Watch - Though my speciality is iPhone apps, I also create Android apps and custom Web Applications for smartphone and desktop users. If the below tech stuff sounds like another language, then no worries - I'll help turn your requirements into a solid app with a strong technical foundation. For technical buyers, I have experience in Objective C, Swift, Ionic, Angular, Node.js, AWS, Parse, Core Data, Java, and integration to other systems with third party API's. If it sounds like we might work well together, then send me a quick note and I'll be happy to share some more details, pricing, and a few tools to help you get a headstart in your app project. We can work by email, phone, or Skype/video, whatever works for you.

    $49.99 /hr
    15 hours
    5.00
  7. Wolfgang Herrmann

    Wolfgang Herrmann

    Super Mobile App Developer

    Germany - Last active: 18 days ago - Tests: 4

    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
  8. Daniel R.

    Daniel R.

    iOS, Swift, WatchKit, Android Expert

    France - Last active: 1 day ago - Tests: 6

    During last 6 years, i developed a wide range of iPhone+Android apps using Objective-C+Swift (Xcode), Java (ADT), Java-Script (Titanium) and C# (Xamarin). About 25 apps have been created in native, and 20 apps are created for multi-platform. I started coding at 11 years old so i've long experience in software development. Now i mainly focus on mobile app development. My competency lies in complete end-end management of a new mobile apps as well as fixing bugs, updating apps to higher version. Swift appears as a new language of iOS app development, and i am the developer for a project which needs to be coded in new language, Swift. With rich experience in project management, i can manage projects from scratch to success. If you are looking to build a top1 app in categories like Social Networking, Photo & Video Sharing, Messaging, Dating, Navigation, Social Game, Fitness then you've come to right place. Thank you for consideration.

    $35.00 /hr
    10 hours
    5.00
  9. Vitaliy Adamchuk

    Vitaliy Adamchuk

    Senior iOS/Android Developer - Swift Expert

    Ukraine - Last active: 1 day ago - Tests: 4

    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. :)

    $33.33 /hr
    248 hours
    5.00
  10. Ferenc Knebl

    Ferenc Knebl

    Senior Mobile Developer for iOS8 and Android, Game, Parse.com

    Hungary - Last active: 3 days ago - Tests: 9

    When I am really happy? I love to hear: "You are doing a great job!" Over the last 10 years, I have been working in IT fields. I got very systematical knowledge and skills of producing software products throughout the analysis of requirements, system design, database schema design, construction of code, deploying and testing. Since 2010 I have started the iOS programming and become very familiar about its development. I am able to work for Android mobile app development as well. So now I am very confident to work with potential clients with various mobile app specifications. I will do the best of my abilities and knowledge to build the apps for them. I love to skate where the puck is going to be, not where it has been. Followings are my major skill sets: ✇ Mobile app & game development ➢ PhoneGap : Cordova, Ionic, Jquery Mobile & Angular Mobile UI ➢ Social Networking, Entertainment, Lifestyle, Education, Business Apps ➢ Google Map, Foursquare, Geolocation, GPS, Open Street Maps ➢ Parse.com, JSONKit, RESTKit, TestFlight, AFNetworking ➢ ApplePay, Stripe, Authorize.Net, Paypal, SagePay,WePAY ➢ XMPP, QuickBox, VSee, OpenTok, Skype, WebRTC ➢ Cocos-2D, Box2D, 2D-x, Unity 3D, Admob, Revmob, Chartboost, Flurry ➢ Push notification(iPhone/Android), Local Notification on Mobile app
 ➢ Facebook, Twitter, Linkedin, Instagram, Youtube, Pinterest, Vimeo ➢ Barcode, QR scanner (iPhone/Android)
 ✇ Web Development ➢ CarrierWave, Kaminari, HAML, SASS, Jammit ➢ Laravel, Symfony2, CodeIgniter, Yii, Zend ➢ Parse.com, Windows Azure, Amazon Web services, Heroku ➢ BackboneJS, AngularJS, EmberJS Best Regards. Ferenc.

    $40.00 /hr
    47 hours
    5.00