Dmitry Ryazantsev

Moscow, Russia

Member since September 21, 2015

Dmitry has 6+ years of Android development. He tries to find the best technologies that suit the project. He has experience with Git, Lua (Corona SDK), RxJava, Dagger and more. He was part of a large team who developed the Yandex Browser that has more than 10 million installations. He communicates well with all projects members. He has also developed his own projects: a game with 250,000 installations, and published several other apps.

Dmitry is now available for hire

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Portfolio

Freelance Work
Java, Android, PHP, MySQL, Lua, Git, Bitbucket, RoboSpice, RxJava, Retrofit...
Emirates (via Toptal)
Java, realm db, rxjava
Yandex LLC
Java, Android, Git, Jira, Stash, TeamCity, Agile, Robolectirc, Clang, JUnit

Experience

Android Layouts, 6 years
Android, 6 years
Java, 6 years
Android SDK, 6 years
Agile Software Development, 4 years
Git, 4 years
RxJava, 1 year
Security, 1 year

Availability

Part-time

Preferred Environment

Android Studio, Git, Linux/Mac OS, TeamCity

The most amazing...

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

Employment

Android Developer
Freelance Work
2010 - PRESENT
- Created an Android game with physics that has 250,000 plus installations.
- Created an Android game that also has iOS and HTML5 versions and was popular in Asia (Japan and Korea).
- Created first clients for the 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.
- Created custom hand drawing algorithm that let users draw physics object on screen and erase part of them.
- Created an app that synchronized user's birthdays from Vkontakte that uses private android API.
Technologies: Java, Android, PHP, MySQL, Lua, Git, Bitbucket, RoboSpice, RxJava, Retrofit, Dagger, Gradle, JUnit, Robolectric
Senior Android Developer
Emirates (via Toptal)
2016 - 2017
- Supported existed code and improve architecture.
- Wrote tests on essential parts of the existed code.
- Created custom session renewal mechanism.
- Created a facebook-like feed with custom cards inside.
- Implemented bidding system that allows user to bid miles for real goods.
Technologies: Java, realm db, rxjava
Android Developer
Yandex LLC
2013 - 2016
- Created a smooth animated shuffle algorithm for a grid of views with drag and drop mechanism.
- Led a subteam.
- Did code review.
- Conducted interviews.
- 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 Developer
Infotecs
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.
- Created a test environment with CORBA.
- Managed a continuous integration process.
Technologies: Java, Android, Security, Crypto Provider
Android Developer
Aplica
2012 - 2012
- Created an algorithm to paint different zones on texture when the user touches it, created this with OpenGL.
- Created 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.
- Built a custom interface with smart text wrapping.
- Built an Android app for a popular Russian company - a catalog of the realty.
Technologies: Java, Android, SVN, OpenGL, REST API

Experience

Phrase of the Day (Development)
https://play.google.com/store/apps/details?id=com.dimlix.phrase
Positive thinking for every day.
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
One of my first apps.
An easy way to create reminders in notifications.
Skippy the Traveler (Development)
https://play.google.com/store/apps/details?id=com.dimlix.skippy
An Android puzzle game built with Lua.
This game also has 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
Created the first version of the app for rune lovers.
Gives you the ability to put runes on photos and save it to your gallery.
Partner ID (Development)
https://play.google.com/store/apps/details?id=com.righthands.partnerid&hl=en
A REST client for the web service.
Robospice and Retrofit are used in the app.
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 their own native part (C++) and Java code. It has more then 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)
https://www.toptal.com/software/time-management-secrets
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)
https://www.toptal.com/android/tips-and-practices
This resource contains a collection of Android best practices and Android tips provided by our Toptal network members.

Skills

Languages
Java, PHP, JavaScript, Lua
Frameworks
Android SDK, JUnit, Robolectric, Corona SDK, AndEngine
Libraries/APIs
VK API, Android API, Robospice, Yandex Maps API, RxJava, Yandex API, Facebook API
Tools
Git, Android Studio, Bitbucket, IntelliJ IDEA, Stash, JIRA, Adobe Photoshop, Gimp
Paradigms
Model View Presenter (MVP), Agile Software Development, Model View Viewmodel (MVVM), Model View Controller (MVC), Functional Programming, Scrum
Platforms
Android, Mac OS, Ubuntu, Ubuntu Linux
Misc
Android Layouts, Security
Storage
Realm, TeamCity, MySQL

Education

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

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