- Android Developer2010 - PRESENTFreelance 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: Java, Android, PHP, MySQL, Lua, Git, Bitbucket, RoboSpice, RxJava, Retrofit, Dagger, Gradle, JUnit, Robolectric - Senior Android Developer2016 - 2017Emirates (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: Java, Realm Database, RxJava - Android Developer2013 - 2016Yandex 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: Java, Android, Git, Jira, Stash, TeamCity, Agile, Robolectirc, Clang, JUnit - Android Developer2012 - 2013Infotecs
- 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: Java, Android, Security, Crypto Provider - Android Developer2012 - 2012Aplica
- 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: Java, Android, SVN, OpenGL, REST API
Dmitry Ryazantsev
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
Portfolio
- Freelance WorkJava, Android, PHP, MySQL, Lua, Git, Bitbucket, RoboSpice, RxJava, Retrofit...
- Emirates (via Toptal)Java, Realm Database, RxJava
- Yandex LLCJava, Android, Git, Jira, Stash, TeamCity, Agile, Robolectirc, Clang, JUnit
Experience
- Android, 7 years
- Java, 7 years
- Android SDK, 7 years
- Agile Software Development, 5 years
- Git, 5 years
- RxJava, 2 years
- Security, 1 year
Availability
Part-time
Preferred Environment
Android Studio, Git, Linux/MacOS, TeamCity
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.
Employment
Experience
- Phrase of the Day (Development)https://play.google.com/store/apps/details?id=com.dimlix.phrase
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)https://play.google.com/store/apps/details?id=ru.human.notes
This is one of my first apps; it's an easy way to create reminders in notifications.
- Skippy the Traveler (Development)https://play.google.com/store/apps/details?id=com.dimlix.skippy
This is an Android puzzle game built with Lua; there are also iOS and HTML5 versions.
- Skyhopper (Development)https://play.google.com/store/apps/details?id=com.dimlix.skyhopper
A small game that was created after the success of the Flappy Bird game with Corona SDK.
- Magic Runes (Development)https://play.google.com/store/apps/details?id=ru.aplica.magicrunes&hl=en
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)https://play.google.com/store/apps/details?id=com.yandex.browser&hl=en
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)https://play.google.com/store/apps/details?id=ru.human.games.draw_and_ride_lite
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.
Skills
- LanguagesJava, Java 7, Java 8, Java 6, Java 9, SQL, Lua, JavaScript, Kotlin, PHP
- FrameworksAndroid SDK, Rx, Dagger 2, Play SDK, AndEngine, Robolectric, JUnit, Glide, PowerMock, Mockito, Roboelectric Testing Framework, Espresso Testing Framework, Corona SDK, React Native
- Libraries/APIsGoogle APIs, Retrofit 2, Butterknife, Firebase Android SDK, Android Support Library, Retrofit, REST API, VK API, Android API, Google API, RxJava 2, VKontakte API, Android Universal Image Loader, Android Design Library, Libraries/APIs, Fabric, Facebook API, Yandex Maps API, Google Play API, Accelerometers, RxJava, Robospice, Picasso, Android OpenGL, Volley Android Library, Mixpanel Android API, Mixpanel API, Zendesk API, Yandex API
- ToolsFirebase Analytics, Git, Android Studio, Crashlytics, Slack, Wrike, Git flow, GitHub, Asana, RealtimeBoard, Gradle, RxAndroid, Vkontakte SDK, Zeplin, Twitter Android SDK, Facebook Android SDK, Adobe Photoshop, BitBucket, Trello, Stash, JIRA, TeamCity, IntelliJ IDEA, Firebase Cloud Messaging (FCM), Android Debug Bridge, Microsoft Excel, Excel 2007, Excel 2016, Excel 2010, Spreadsheets, Corel VideoStudio, Adobe Premiere Pro, Android Device Manager, CircleCI, Skype, Android NDK, Instabug, Gimp, 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, Google Analytics
- ParadigmsObject-oriented Principles, Object-oriented Programming (OOP), Mobile Development, RESTful Development, REST, Model View Presenter (MVP), Continuous Deployment, Continuous Delivery (CD), Test Automation, Scrum, Model View Viewmodel (MVVM), Model View Controller (MVC), Continuous Integration (CI), Automation Testing, Automated Testing, Agile Workflow, Agile, Agile Software Development, Mobile App Design, Android Material Design, Functional Programming, Photoshop Design, Unit Testing, Test-driven Development (TDD)
- PlatformsMobile, Android, Firebase, Ubuntu Linux, Android Oreo, Android Watch, Mixpanel, Zendesk, Ubuntu, Eclipse, MacOS, Mac OS
- OtherAPIs, Google Play Store, App UI, Apps, Mobile App Development, RESTful Services, RESTful APIs, Mobile Applications, Mobile App UX, Computer Skills, Computer Science, Layout, HTTP REST, Mobile App Testing, Mobile App UI, Mobile UI, Slack App, Security, Git Forks, GitKraken, Git GUI, RESTful Web Services, User Experience (UX), Computer Security, Browsers, Cyber Security, Android Style Guidelines, Cross-platform App Development, Android Theming, Libraries, UI Animation, App UX, OkHttp, Macbook, SDKs, Android Camera App, Android Components, Android Testing, Android UI Design, Android Performance Optimization, Android Guides, Android Studio Emulators, Android Emulators, Android App Design, Android Design Guidelines, Android App Development, Android Data Binding, Android Development, Android Screens, Analytics, GUI Development, Espresso, Test Automation Frameworks, Automated UI Testing, Automated Tests, Hybrid Apps, Game Development, Data, Data Structures, Algorithms, Push Notifications, Bluetooth, Mobile GPS, GPS, NFC, Android Internals, Android Game Development, Android Games, Android Wear
- StorageSQLite, MySQL, Realm, Realm Database
Education
- Bachelor of Science degree in Computer Science2007 - 2012Moscow State University - Moscow, Russia
