Andrei Buneyeu, Kotlin Multiplatform Developer in Lisbon, Portugal
Andrei Buneyeu

Kotlin Multiplatform Developer in Lisbon, Portugal

Member since October 25, 2015
Andrei is a freelance Android developer with more than 10 years of professional Android experience. He is passionate about making code scalable, testable, and multiplatform. Andrei is experienced with TDD/BDD paradigms and collaboratively orchestrating large architectural code changes.
Andrei is now available for hire




Lisbon, Portugal



Preferred Environment

Git, Android Studio

The most amazing...

...thing I've developed is a multiplatform payment terminal emulator.


  • Senior Android Developer

    2022 - PRESENT
    Industry leader in waste management services
    • Introduced new features and improved a slow and unreliable app.
    • Led the complete refactoring to the modern Android stack: declarative Jetpack Compose framework, Dagger/Hilt, MVVM, Kotlin Coroutines, and Delegates that allowed optimizing the UI and resources for real-time geolocation-based algorithms.
    • Implemented automation algorithms using real-time geolocation and spatial trigonometry, processing 1000s of parcels and trucks multiple times per second.
    • Established the whole CI process in the company: Git repository, CircleCI with a local and remote build cache, uploading builds to a private FTP server;
    • Split the monolith codebase into multiple Gradle modules, helping developers separate the responsibilities;
    • Introduced extensive ViewModel tests to the codebase;
    Technologies: Android, Kotlin, Full-stack Development, Model View Viewmodel (MVVM), Test-driven Development (TDD), Room, Geofencing, Location Services and Maps, Performance, WorkManager API, REST APIs, Minimum Viable Product (MVP), Coroutines, Jetpack Compose, Hilt, Camera API
  • Senior Android Developer

    2022 - PRESENT
    Codecontrol Client
    • Worked on a new version of one of India's oldest and most popular cryptocurrency exchange apps from scratch using declarative UI (Jetpack Compose) and Kotlin Multiplatform for both mobile platforms.
    • Participated in key decisions about architecture that would make the app scalable, testable, and stable between the mobile platforms.
    • Maintained and updated the old legacy version of the app while adding new features and ensuring the stability of the old ones.
    • Gained experience working with the modern UI frameworks (Jetpack Compose) and multiplatform ViewModels shared between iOS and Android.
    Technologies: Android Jetpack, iOS, Kotlin Multiplatform, Coroutines, Ktor, Kotlin, KOIN,, Model View Viewmodel (MVVM), Observer Pattern, Mobile Development, Mobile App Development, Cross-platform, Mobile Apps, Android Studio, Android SDK
  • Java Android Developer for Creating Foreground Service

    2023 - 2023
    RAF Technology
    • Created a Foreground Service wrapping native C++ code provided by client into an external api that could be used by multiple partner applications.
    • Connected a custom barcode scanner/imager of Zebra TC57 and similar devices to the Foreground Service.
    • Made a Test App to help the client to demonstrate the abilities of their native C++ Image Recognition solution to their customers and expand their presence in the mobile space.
    Technologies: Android Foreground Services, Android, Java, Kotlin, IPC, AIDL, Android NDK, NDK, Java Native Interface (JNI), Image Recognition, Camera API
  • Senior Android Developer

    2020 - 2021
    • Assisted in stabilizing and scaling the existing codebase of a security-sensitive financial B2B library as a part of the mobile reliability team.
    • Implemented emulated payment terminals with Kotlin Multiplatform and coroutines and emulated back-end that reduced total test execution time from around one hour to just a few minutes on all the platforms, including iOS, Android, and JVM.
    • Achieved exceptional experience working across platforms using iOS, Android, JVM, and the full-stack environment.
    • Featured Toggle, which allowed to dynamically control certain library features from the server, providing a safety mechanism for all the new features. Developed a microservice from scratch, along with the client versions for all the platforms.
    • Introduced a breakpoints feature into the test code, allowing the concurrent legacy codebase to test faster and more reliably.
    • Promoted an event-based multiplatform architecture as part of the team to at least two other teams, together with the best practices.
    Technologies: Kotlin, Coroutines, Behavior-driven Development (BDD), Test-driven Development (TDD), Android, Kotlin Multiplatform, Jenkins, Full-stack, iOS, Java, Observer Pattern, REST APIs, CI/CD Pipelines, Mobile Development, Mobile App Development, Cross-platform, Full-stack Development, Mobile Apps, Android Studio, Android SDK
  • Android Developer

    2018 - 2020
    Dubsmash (via Toptal)
    • Engaged to work on a popular video app with hundreds of thousands of DAUs and was accountable for everything, including building features, analytics, testing, publishing, keeping the app up-to-date, and improving the underlying infrastructure.
    • Helped to establish the best dependency injection practices, decomposition patterns, multi-module projects, and Kotlin delegation, which made the codebase scalable, flexible, and testable.
    • Initiated and moved the caching infrastructure towards the Apollo GraphQL cache, which made the codebase scalable, delivering optimistic UI updates across the app from a single source of truth.
    • Contributed to establishing the best unit, integration, and instrumented testing practices for the team, which helped ensure the feature quality and analytics implemented.
    Technologies: Android, Java, Kotlin, Apollo, Observer Pattern, REST APIs, Mobile Development, Mobile App Development, Mobile Apps, Android Studio, Android SDK, RxJava 2
  • Android Developer

    2017 - 2018
    • Worked on a mobile version of HubSpot (inbound marketing and sales software), building features that compliment the desktop experience and bringing use cases that are most valuable for users on the go.
    • Worked mostly on core and infrastructure for both Android and iOS apps.
    • Improved the data layer, data retrieving, and caching of the proprietary solutions and Room persistance library.
    • Improved performance and reliability, reported errors and metrics, and analyzed and created an automatic alert system.
    • Improved testability and scalability, integrating the best dependency injection practices into the codebase (Android).
    • Encouraged independence of different mobile teams, splitting the existing codebase into different modules and repositories.
    Technologies: React Native, RxJava, Dagger 2, Swift, Kotlin, Observer Pattern, Room, REST APIs, Mobile Development, JavaScript, Mobile App Development, Mobile Apps, Android Studio, Android SDK
  • Android Developer

    2011 - 2015
    Softeq Development
    • Developed an iBeacon-enabled mobile app that notifies the user about currently available deals based on their location.
    • Worked on a world-famous game conference app for fetching up-to-the-minute updates and activities planning.
    • Modified Android standard apps to provide an auto-setup feature for a railway operator to its company-wide adopted tablets.
    • Developed a video-processing app for a sports brand, cutting slow-motion video and overlaying a precise timestamp on each frame.
    • Developed a secured money-management app.
    • Worked on several Cocos2d-x games.
    Technologies: iBeacon, Cocos2d-x, REST, C++, C, Java, Mobile Development, Mobile App Development, Mobile Apps, Android Studio, Android SDK
  • Mobile and Web Developer

    2009 - 2011
    • Developed several J2ME games.
    • Worked on several CMSs written in PHP.
    • Developed a Twitter client for Android 1.6.
    • Developed a ringtone-creator for Android that cut audio files of several formats frame-by-frame.
    • Developed several card games for Android 1.6.
    • Developed a tiny CAD app for Windows Mobile 6.1.
    Technologies: Android, HTML, PHP, Windows Mobile, .NET Compact, C#, J2ME, Mobile Development, Mobile App Development, Mobile Apps, Android Studio, Android SDK


  • HubSpot Mobile App

    A mobile version of the HubSpot product (inbound marketing and sales software).

  • iBeacon-enabled Mobile App

    I developed an iBeacon-enabled mobile application that pushes notifications about deals and special offers available at the given point of sale to a user. The alerts are triggered when the user steps into an iBeacon zone. Additionally, a web-based dashboard and administration console was created to allow a dedicated user to manage content, iBeacons, application themes (e.g., colors, logos for the app distribution purposes), deals, as well as to view statistics and reports.

    Technologies: Java, iBeacon

  • Sport Video Timer App

    Android video stopwatch application. The application takes slow-mo video (up to 120 fps) and disassembles it into frames. The user chooses frames of motion start/end. Based on this information app calculates high-precise time of motion. When assembling the video anew, the timer with accurate time is overlayed on each frame of the video.

    Technologies: Java, C, FFmpeg

  • Comics Engine

    A comics engine with parallax scrolling feature. Comics scenes are stored in a special data format. Instead of plain pictures, there used several Z-layers for every scene, so that creates a pretty looking "parallax" effect and new experience for the user. All textures are loaded in a separate GL context, so it provides seamless texture loading/unloading.

    Technologies: Java, LibGDX, OpenGL

  • DLNA Library and Apps

    Adapted a customer DLNA library written in C to an Android library using JNI. Worked on several digital media management/sharing apps based on this library for storing (DMS in DLNA terminology), playing (DMR), and controlling (DMC). Everything can be played on everything using any device as a remote controller.

    Technologies: Java, C, DLNA, and AIDL.

  • Cocos2D-x Game

    Worked on a crossplatform zuma-like game based on cocos2d-x engine. Worked on a framework that allows customer to customize the game flexibly without recompiling source-code. Developed Android-dependent parts like the sound engine and social network integrations.

    Tehnologies: C++, Objective-C, Java, Cocos2d-x

  • World-famous Game Conference App

    Worked on a world-famous game conference app. Features:
    - Updated news and timetable
    - Activities planning (reminder notifications)
    - Map of the event
    - (a video platform for gamers) live streaming

    Technologies: Java, REST


  • Languages

    Java, Kotlin, C#, PHP, HTML, Swift, C++, C, Scala, SQL, JavaScript
  • Frameworks

    Android SDK, Dagger, .NET Compact, Dagger 2, React Native, LibGDX, Cocos2d-x, Ktor, KOIN
  • Libraries/APIs

    RxJava, Android API, RxJava 2, Retrofit, REST APIs, Parse SDK, Facebook SDK, Picasso, Android Universal Image Loader, Otto, Android Support Library, Firebase Android SDK, WorkManager API, NDK, Camera API
  • Tools

    Android Studio, greenDAO, Mercurial, Git, Subversion (SVN), Jenkins, Android Jetpack, Android NDK
  • Paradigms

    Mobile Development, Cross-platform, REST, Dependency Injection, Functional Programming, Functional Reactive Programming, Behavior-driven Development (BDD), Test-driven Development (TDD), Model View Viewmodel (MVVM)
  • Platforms

    Android, J2ME, Windows Mobile, Firebase, iOS
  • Other

    HubSpot, Mobile App Development, Mobile Apps, Google Material Design, Observer Pattern, Room, CI/CD Pipelines, iBeacon, OAuth, OkHttp, Coroutines, Kotlin Multiplatform, Full-stack, Apollo, AIDL, Java Native Interface (JNI), Full-stack Development, Geofencing, Location Services and Maps, Performance, Minimum Viable Product (MVP), Jetpack Compose, Hilt, Android Foreground Services, IPC, Image Recognition
  • Storage

    Realm, MongoDB, SQLite,


  • Bachelor's Degree in Software systems in Telecommunications Networks
    2009 - 2013
    The Higher State College of Communications - Minsk

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