Akio Takei, Software Developer in Tokyo, Japan
Akio Takei

Software Developer in Tokyo, Japan

Member since October 9, 2017
Akio is an experienced full-stack developer who has a solid background in creating complex apps for iOS and Android devices as well as building awesome web applications with robust backend. Over the past eight years, he solved many complex and technical problems with his strong logic and creativity. He is well versed in Swift, Java, Javascript, React Native and also an expert in building web applications, PWA and REST API, and GraphQL back ends.
Akio is now available for hire




Tokyo, Japan



Preferred Environment

React Native, JavaScript, Android Studio, Xcode

The most amazing...

...thing I've developed is a kind of clustering map for iOS and Android using Google Map APIs that spreads from points to points.


  • Freelance Senior Mobile App Developer

    2019 - 2019
    CARRY BIBLE PTY LTD (via Toptal)
    • Built the app with React Native and Firebase, and I worked on building advanced user experiences for the app.
    • Developed a content creation feature from which users can create some content for easy understanding of bible sections. Built comment system where other users can add their thoughts and replies.
    • Created group features where users can create and join a group with a group goal and a feed system where users can see the feeds from group members.
    • Built a React Native component to work directly with iOS/Android Native features for audio playback.
    Technologies: Redux, Firebase, React Native
  • Freelance Mobile Developer

    2018 - 2018
    Under Lucky Stars (via Toptal)
    • Created a tab navigation-based app for iOS and Android using React Native.
    • Implemented listing feeds, posting, and sharing.
    Technologies: REST APIs, Navigation, TabBar, React Native
  • Mobile Developer

    2017 - 2017
    • Developed a property management app for iOS and Android using Swift and Java from scratch.
    • Created customized and sophisticated UI/UX elements to be compatible for both Phone and Tablets.
    • Implemented complex data structure using Realm.
    • Helped back-end developer and fixed errors.
    • Published apps to Apple App Store and Google Play Store successfully.
    Technologies: RxJava, RxSwift, Picasso, Alamofire, Realm, Java, Swift
  • Mobile Developer

    2016 - 2017
    • Cleaned source code, fixed bugs, added new features and updated functions.
    • Created customized clustering map using Google Map APIs, which spreads from points to points.
    • Developed a web app for admin users and business users using ReactJS.
    • Implemented realtime Explorer page using ParseLiveQuery sdks.
    • Used Parse SDK for iOS, Android and Web.
    Technologies: RxJava, RxSwift, React, APIs, Google, Parse, Java, Swift
  • Team Leader and Mobile Developer

    2015 - 2017
    • Monitored all aspects of apps & games being developed to ensure they met quality standards.
    • Redesigned and developed Messaging on iOS using Realm achieving reliability and scalability.
    • Developed and maintained over 20 apps & games in the Apple App Store and Google Play Store.
    • Performed QA on existing iOS and Android applications.
    • Directed team meetings to check on progress and plan code direction.
    Technologies: GameKit, Xamarin, React Native, Alamofire, Realm, C#, Objective-C, Java, Swift
  • Mobile Developer

    2016 - 2016
    • Created a Tinder-style dating app for iOS which has real time chat function using Phoenix socket framework.
    • Ported iOS app to Android version with slight changes in UI.
    • Refined and developed features resulting in decrease of crashes by 50%, increase in user retention by 200%.
    • Provided useful suggestions for better performance and user-friendly UI.
    • Designed database using Core Data.
    Technologies: RxJava, RxSwift, Core Data, Phoenix, Java, Swift
  • Mobile Developer

    2013 - 2015
    • Optimized applications for new iOS and Android operating systems.
    • Fixed bugs which were reported by Product managers and customers.
    • Implemented local storages using Core Data and created some offline features.
    • Designed and developed an interactive video/audio player for iOS.
    • Developed some location-based apps for restaurants using Google Place APIs.
    Technologies: Xamarin, AFNetworking, Core Data, C#, Swift, Java, Objective-C


  • Duby iOS App (Development)

    This is a social app created for iOS that implemented photo and video sharing.

  • Duby Android App (Development)

    This is a social app created for Android that implemented photo and video sharing.

  • Wango iOS App (Development)

    This is a dating app created for iOS that has real-time chat using the Phoenix framework.

  • Wango Android App (Development)

    This is a dating app created for Android that has real-time chat using the Phoenix framework.

  • Dwellant iOS App (csite) (Development)

    This is a business app created for iOS that provides cloud-based service for property management.

  • Dwellant Android App (csite) (Development)

    This is a business app created for Android that provides cloud-based service for property management.

  • Carry Bible (Development)

    A social network for bible readers.


  • Languages

    Swift, Objective-C, Java, Kotlin, C++, JavaScript, C#, HTML5, SCSS, CSS3
  • Frameworks

    GameKit, React Native, Core Data, AFNetworking, Redux, AngularJS, Phoenix
  • Libraries/APIs

    RxSwift, Firebase Android SDK, REST APIs, RxJava, CocoaPods, Parse SDK, React, RxJava 2, RxSwift 4, Firebase iOS SDK, Twitter SDK, Facebook SDK, Alamofire, Vue.js 2, Node.js, Instagram API, Socket.IO, Google APIs, Braintree API, PayPal API, Picasso
  • Tools

    Jira, Eclipse IDE, GitHub, Bitbucket, AWS Push Notification Service (AWS SNS), Android Studio, Sublime Text, Gradle, Git, Google Cloud Messaging, Xcode, Apple Push Notifications, Firebase Cloud Messaging (FCM), TabBar
  • Platforms

    iOS, Android, Parse, Mobile, Xamarin, Firebase, Ubuntu, Heroku
  • Storage

    Realm, MongoDB, MySQL, Firebase Realtime Database, PostgreSQL
  • Other

    Freelance Developer, Mobile App UX, Mobile App UI, Mobile App Development, AdMob, Google, APIs, Navigation, ESLint
  • Industry Expertise



  • Bachelor's degree in Computer Engineering
    2008 - 2012
    Hokkaido University - Sapporo, Japan

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