Andrew is available for hire

Andrew Abakumov

Verified Expert in Engineering

Android Developer

Location

Istanbul, Turkey

Toptal Member Since

June 11, 2021

Andrew is a senior Android developer who started out with Java at a global telecommunications company. After the first smartphones appeared, he saw the power and potential of mobile apps and switched his focus to Android. Andrew now has a decade of Android expertise under his belt, with in-depth knowledge of cloud storage, email, instant messaging, and marketplace apps. A professional highlight of Andrew's is developing an in-app instant messenger Android app with over ten million downloads.

Java Android Android SDK Kotlin Linux Git SQLite REST APIs XML Parsing XML XMPP OpenGL ES WebLogic Android Studio Oracle WebView

Portfolio

Toptal

Android, Kotlin, REST, REST APIs

Self-employed

Kotlin Multiplatform, GLSL, WebGL, OpenGL ES

Remontnik, LLC

Android, Java, Kotlin, Retrofit, Room, SQLite, WebSockets, REST APIs

Experience

Java - 14 years Android - 10 years Git - 10 years SQLite - 10 years XMPP - 3 years Kotlin - 3 years WebView - 3 years OpenGL ES - 3 years

Availability

Part-time

Preferred Environment

Linux, IntelliJ IDEA, Android Studio, Android SDK, Java, Kotlin, Git, Jetpack Compose

The most amazing...

...cloud storage Android app I've built is for Yandex: the disk reminded users of Dropbox, but they liked it much more, and it had superior ratings on Google Play.

Work Experience

Expert Android Developer

2021 - PRESENT

Toptal

Developed two mobile Android Apps for Customers of Android.
Developed medical services app for school students and their families; more information can be found at Play.google.com/store/apps/details?id=io.humanfractal.shine.
Developed a health and wellness app for medical services and remote therapeutics, specifically personalized virtual care; more information can be found at Play.google.com/store/apps/details?id=com.pytheos.resolute.

Technologies: Android, Kotlin, REST, REST APIs

Kotlin Multiplatform Developer

2020 - 2022

Self-employed

Developed my own multiplatform 3D game engine using Kotlin Multiplatform, which runs on Android, iOS, desktop, and the web.
Remade a good-old arcade billiard game using my 3D game engine; more information can be found at Yandex.com/games/app/191647.
Created an MVP of 3D interior design software—covering floors, walls, doors, windows, furniture, and walls; it was built using my own 3D engine and developed with Kotlin Multiplatform.

Technologies: Kotlin Multiplatform, GLSL, WebGL, OpenGL ES

Senior Android Developer

2015 - 2021

Remontnik, LLC

Developed an Android marketplace app for building and repairing services.
Developed in-app messenger for a custom WebSocket API.
Integrated third-party payment systems for services payments.
Set-up continuous integration with GitLab CI for building and test running.
Developed a filling and validation tool that also sent forms with complicated business logic.
Managed a team of two internal developers and with one outsourcing developer.

Technologies: Android, Java, Kotlin, Retrofit, Room, SQLite, WebSockets, REST APIs

Android Application Developer

2015 - 2015

Self-employed

Developed my own Android project from scratch (both coding and design).
Created a camera app with colorful effects and real-time previews.
Reimplemented graphical effects processing from CPU to GPU (using OpenGL ES), that resulted in high FPS increase.

Technologies: Android, Java, OpenGL ES, Kotlin Multiplatform, Camera API, REST APIs

Android Applications Developer

2011 - 2014

Yandex

Developed Android apps for email, instant messaging and cloud storage.
Created a WebDAV protocol client with custom extensions.
Developed parsing for the custom binary protocol of a cloud storage app.
Initiated file and directory synchronization with a remote source for an Android cloud storage app.
Refactored legacy code to make it much more readable and efficient.
Developed an XMPP protocol client with custom extensions.
Delivered certain parts of the account manager (common component for the company's Android apps).

Technologies: Android, Java, WebDAV, XML, JSON, WebView, SQLite, REST APIs, XML Parsing

Software Developer

2007 - 2010

Netcracker

Developed integrations with client's web services using Java, WSDL, and custom XML protocols.
Built Servlets and JavaServer Pages (JSP) pages for product configuration.
Developed code generation tools for internal company usage.
Implemented business logic for workflow via specifications using Java and Oracle SQL, PL/SQL.

Technologies: Java, WebLogic, Oracle, SQL, REST APIs, XML Parsing

Experience

Yandex.Disk — Cloud Storage App

https://play.google.com/store/apps/details?id=ru.yandex.disk

A cloud storage Android application for documents, photos, videos and other files with automatic background synchronization of data. I was one of the key developers and together we created this fast app with great user experience and high Google Play ratings.

Yandex.Mail

https://play.google.com/store/apps/details?id=ru.yandex.mail

A fast and reliable email client with an in-app instant messenger Android application. I ported the legacy code from a J2ME project and refactored it to be more readable and suitable for the Android platform. Now it has more than ten million installs.

Sine Pariwar — Healthcare App

https://play.google.com/store/apps/details?id=io.humanfractal.shine

A healthcare mobile Android app for school students and their families, which provides simple access to medical services like therapeutics, medical analysis, connection with school doctors, and making an appointment with a doctor.

Resolute — Personal Healthcare Services

https://play.google.com/store/apps/details?id=com.pytheos.resolute

A mobile Android app for health and wellness service for personalized virtual care.

It had a remote video connection with a care team feature: that includes doctors, nurses, and health coaches.

It allowed users to make appointments for medical analysis and doctors.

Lead Android Developer

I developed a camera surveillance app for Android. This app uses a smartphone as a camera and a server for video storage and hosts the web console inside a local area network. The web console can provide real-time video surveillance, motion detection, and playback of motion recordings.

Skills

Languages

Java, Kotlin, XML, SQL, GLSL

Frameworks

Android SDK

Platforms

Android, Linux, Oracle

Libraries/APIs

REST APIs, Camera API, OpenGL ES, Retrofit, WebGL

Tools

Git, Android Jetpack, IntelliJ IDEA, Android Studio, WebView

Storage

SQLite, XML Parsing, JSON

Other

Numerical Modeling, Numerical Simulations, 3D Math, WebSockets, Coroutines, Physical Science, WebLogic, WebDAV, XMPP, Room, Jetpack Compose, Kotlin Multiplatform

Paradigms

REST

Education

2004 - 2010

Master's Degree in Applied Mathematics, Physics, and Informatics

Moscow Institute of Physics and Technology (MIPT) - Moscow, Russia

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