Dmitry Ryazantsev, Software Developer in Moscow, Russia
Dmitry Ryazantsev

Software Developer in Moscow, Russia

Member since September 21, 2015
Dmitry is an Android developer with more than six years of experience who communicates well and always tries to find the best tech that suits the project. He's experienced with Git, Lua (Corona SDK), RxJava, Dagger, etc. He's worked with a large team to develop the Yandex browser that has more than 10 million installations. He's also developed his own projects: a game with 250,000 installations and published several other apps.
Dmitry is now available for hire


  • Freelance Work
    Robolectric, JUnit, Gradle, Dagger, Retrofit, RxJava, Robospice, Bitbucket...
  • Emirates (via Toptal)
    RxJava, Realm Database, Java
  • Yandex LLC
    Robolectric, JUnit, Clang, Agile, TeamCity, Stash, Jira, Git, Android, Java



Moscow, Russia



Preferred Environment

TeamCity, MacOS, Linux, Git, Android Studio

The most amazing...

...things I've been involved is the Yandex browser with more than 10 millions installs and a solo project, the Draw-&-Ride Android game with 250,000+ installs.


  • Android Developer

    2010 - PRESENT
    Freelance Work
    • Created an Android game with physics that has 250,000 plus installations.
    • Developed an Android game that also has iOS and HTML5 versions and was popular in Asia (Japan and Korea).
    • Built a system for a synchronization of contacts and birthdays for a popular Russian social network VK (formerly Vkontakte); even before the first official app was created.
    • Assembled a team to develop my apps: designers and one other developer.
    • Created several apps (REST clients) as an independent contractor.
    • Wrote a custom hand-drawing algorithm that let users draw physics object on the screen and erase part of them.
    • Built an app that synchronized users' birthdays from Vkontakte that uses a private Android API.
    Technologies: Robolectric, JUnit, Gradle, Dagger, Retrofit, RxJava, Robospice, Bitbucket, Git, Lua, MySQL, PHP, Android, Java
  • Senior Android Developer

    2016 - 2017
    Emirates (via Toptal)
    • Supported the existed code and improved the architecture.
    • Wrote tests on the essential parts of the existed code.
    • Developed a custom session renewal mechanism.
    • Created a Facebook-like feed with custom cards inside.
    • Implemented a bidding system that allows the user to bid miles for real goods.
    Technologies: RxJava, Realm Database, Java
  • Android Developer

    2013 - 2016
    Yandex LLC
    • Created a smoothly animated shuffle algorithm for a grid view with a drag-n-drop mechanism.
    • Led a subteam.
    • Conducted code reviews.
    • Held interviews for open positions.
    • Made speeches at mobile conferences in Yandex.
    • Created the infrastructure for project documentation.
    • Built several features from scratch and also the custom user interfaces for them.
    Technologies: Robolectric, JUnit, Clang, Agile, TeamCity, Stash, Jira, Git, Android, Java
  • Android Developer

    2012 - 2013
    • Created a library for XML digital signatures for Android developers.
    • Wrote dozen of tests for Crypto providers.
    • Created an Android Crypto provider for Android developers.
    • Built a test environment with CORBA.
    • Managed a continuous integration process.
    Technologies: Crypto, Security, Android, Java
  • Android Developer

    2012 - 2012
    • Wrote an algorithm to paint different zones on texture when the user touches it; used OpenGL.
    • Built an UI to place images above other images (with rotation and scaling) and the ability to save to an Android device.
    • Created a messenger for the Russian social network site VK (formerly Vkontake) in order to beat the competition.
    • Designed a custom interface with smart-text wrapping.
    • Built an Android app for a popular Russian company (a catalog for realty firms).
    Technologies: REST API, OpenGL, Subversion (SVN), Android, Java


  • Phrase of the Day (Development)

    This app provides positive thinking for every day; it also has widgets for the Android desktop and an app for the Android watch.

  • Tray Notes (Development)

    This is one of my first apps; it's an easy way to create reminders in notifications.

  • Skippy the Traveler (Development)

    This is an Android puzzle game built with Lua; there are also iOS and HTML5 versions.

  • Skyhopper (Development)

    A small game that was created after the success of the Flappy Bird game with Corona SDK.

  • Magic Runes (Development)

    I created the first version of the app for rune lovers. This app gives you the ability to put runes on your photos and save it to your gallery.

  • Partner ID (Development)

    A REST client for the web service; Robospice and Retrofit are used in the app and Partner ID lets you check your contractors.

  • Yandex Browser (Development)

    The browser is built above Chromium and has its own native part (C++) and Java code. It has more than 10,000,000 installs.

  • Draw and Ride (Development)

    An Android puzzle game with physics. The user can ride on a hand-drawn road. This game was popular in Korea (not via Google Play) and has 250,000 plus installs in Google Play other than in Korea.

    This game took a part in a worldwide competition AppCircus.

  • Time Management Secrets of an Efficient Engineer (Publication)
    Freelancers work flexible hours, but this convenience comes at a price: They have to manage their time better than on-site professionals. However, it also means they're free to optimize their routine and achieve exceptional efficiency. In this post, software engineer Dmitry Ryazantsev will guide you through the ins and outs of personal time management, leaving little to chance. What good are great rates if you waste hours each week?
  • Android Best Practices and Tips by Toptal Developers (Publication)
    This resource contains a collection of Android best practices and Android tips provided by our Toptal network members.


  • Languages

    Java, Java 7, Java 8, Java 6, Java 9, SQL, Kotlin, PHP, JavaScript, Lua
  • Frameworks

    Android SDK, Rx, Dagger 2, Play SDK, AndEngine, JUnit, Robolectric, Dagger, React Native, Glide, PowerMock, Mockito, Roboelectric Testing Framework, Espresso Testing Framework, Corona SDK
  • Libraries/APIs

    Butterknife, Firebase Android SDK, Android Support Library, Google APIs, REST APIs, Retrofit, Retrofit 2, VK API, Android API, Accelerometers, Libraries/APIs, Fabric, Google Play API, Picasso, Google API, RxJava 2, VKontakte API, Android Universal Image Loader, Android Design Library, RxJava, Robospice, Yandex Maps API, Facebook API, OpenGL, REST API, Android OpenGL, Volley Android Library, Mixpanel Android API, Mixpanel API, Zendesk API, Yandex API
  • Tools

    Firebase Analytics, Android Studio, Git, Trello, Android Debug Bridge, Android Device Manager, Skype, Crashlytics, Slack, Wrike, Asana, RealtimeBoard, Zeplin, CircleCI, Firebase Cloud Messaging (FCM), Microsoft Excel, Excel 2007, Excel 2016, Excel 2010, Spreadsheets, Corel VideoStudio, Adobe Premiere Pro, Git Flow, GitHub, Gradle, RxAndroid, VKontakte SDK, Twitter Android SDK, Facebook Android SDK, IntelliJ IDEA, Bitbucket, Adobe Photoshop, Jira, Stash, TeamCity, Subversion (SVN), Google Analytics, Android NDK, Instabug, Adobe CC, Adobe, Photoshop 2017, Photoshop CS3, Photoshop CS6, Photoshop 2015, Photoshop 2014, Photoshop CC, Photoshop CS5, Photoshop 7, Sketch, Sketch 4, Sketch 2, Sketch 3, Gimp
  • Paradigms

    Object-oriented Programming (OOP), Mobile Development, RESTful Development, REST, Model View Presenter (MVP), Continuous Deployment, Continuous Delivery (CD), Continuous Integration (CI), App Development, Test Automation, Mobile App Design, Automation Testing, Automated Testing, Agile Workflow, Agile, Android Material Design, Scrum, Model View Viewmodel (MVVM), Model View Controller (MVC), Agile Software Development, Functional Programming, Unit Testing, Test-driven Development (TDD), Photoshop Design
  • Platforms

    Mobile, Android, Firebase, Linux, Android Oreo, Android Watch, Mixpanel, Zendesk, MacOS, Eclipse, Ubuntu, Ubuntu Linux
  • Other

    Google Play Store, App UI, Apps, Mobile App Development, HTTP REST, RESTful APIs, RESTful Services, Mobile App UI, Mobile Applications, Computer Science, Computer Skills, Mobile App UX, Layout, Mobile App Testing, Mobile UI, APIs, User Experience (UX), Android Theming, Android Style Guidelines, Libraries, UI Animation, App UX, OkHttp, Analytics, Slack App, GUI Development, RESTful Web Services, Android Performance Optimization, Android Emulators, Android Development, Git Forks, GitKraken, Git GUI, Computer Security, Browsers, Cross-platform App Development, Macbook, SDKs, Android Camera App, Android Components, Android Testing, Android UI Design, Android Guides, Android Studio Emulators, Android App Design, Android Design Guidelines, Android Data Binding, Android Screens, Clang, Crypto, Data, Data Structures, Algorithms, Push Notifications, Bluetooth, Game Development, Mobile GPS, GPS, Near-field Communication (NFC), Hybrid Apps, Android Internals, Android Game Development, Android Games, Android Wear, Espresso, Test Automation Frameworks, Automated UI Testing, Automated Tests
  • Industry Expertise

    Cybersecurity, Security
  • Storage

    SQLite, Realm Database, MySQL, Realm


  • Bachelor of Science degree in Computer Science
    2007 - 2012
    Moscow State University - Moscow, Russia

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