Andrei is available for hire
Hire AndreiAndrei Buneyeu
Verified Expert in Engineering
Kotlin Multiplatform Developer
Lisbon, Portugal
Toptal member since October 25, 2015
Bio
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.
Portfolio
Industry Leader in Waste Management Services
Android, Kotlin, Full-stack Development, Model View ViewModel (MVVM)...
Codecontrol Client
Android Jetpack, iOS, Kotlin Multiplatform, Coroutines, Ktor, Kotlin, KOIN...
RAF Technology
Android Foreground Services, Android, Java, Kotlin, IPC...
Experience
- Android - 10 years
- Java - 10 years
- Kotlin - 6 years
- Dagger - 3 years
- RxJava - 3 years
- Kotlin Multiplatform - 3 years
- Coroutines - 2 years
- Behavior-driven Development (BDD) - 2 years
Availability
Full-time
Preferred Environment
Git, Android Studio
The most amazing...
...thing I've developed is a multiplatform payment terminal emulator.
Work Experience
Senior Android Developer
2022 - PRESENT
Industry Leader in Waste Management Services
- Introduced new features and optimized a previously slow, unreliable app.
- Led a complete refactor to modern Android technologies (Jetpack Compose, Dagger/Hilt, MVVM, Kotlin Coroutines, Delegates), significantly improving UI performance and resource usage for real-time geolocation algorithms.
- Developed automation algorithms using real-time geolocation and spatial trigonometry, processing 1000s of parcels and trucks multiple times per second.
- Implemented a real-time audio messaging feature with Bluetooth push-to-talk microphones (“in-house WhatsApp”).
- Integrated multiple UVC cameras via USB to enable automatic photo capturing triggered by specific events.
- Applied object detection models to real-time UVC camera feeds, providing safety-critical features for on-site operations.
- Introduced extensive ViewModel testing, improving code quality and maintainability.
- Modularized a monolithic codebase into multiple Gradle modules, enhancing the separation of concerns and team productivity.
- Established a comprehensive CI process, including setting up a Git repository, configuring CircleCI with local and remote build caching, and automating build uploads to a private FTP server.
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, Dagger, Retrofit, OkHttp, Android Jetpack, Unit Testing, UI Testing, Google Maps, Bluetooth
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, Compose.io, Model View ViewModel (MVVM), Observer Pattern, Mobile Development, Mobile App Development, Cross-platform, Mobile Apps, Android Studio, Android SDK, Dagger, Retrofit, OkHttp, Jetpack Compose, Unit Testing, UI Testing
Java Android Developer
2023 - 2023
RAF Technology
- Created a foreground service wrapping native C++ code provided by the client into an external API that multiple partner applications could use.
- 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, Android Interface Definition Language (AIDL), Android NDK, NDK, Java Native Interface (JNI), Image Recognition, Camera API, Dagger, Model View ViewModel (MVVM)
Senior Android Developer
2020 - 2021
Visa
- 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 an 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, Dagger, Retrofit, OkHttp, Unit Testing, Clean Architecture, Fintech
Android Developer
2018 - 2020
Dubsmash
- 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, Dagger, Retrofit, OkHttp, UI Testing, GraphQL
Android Developer
2017 - 2018
HubSpot
- 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, Dagger, Retrofit, OkHttp, UI Testing
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
Freelance
- 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
Experience
HubSpot Mobile App
https://play.google.com/store/apps/details?id=com.hubspot.androidA 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
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
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
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.
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
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
- Twitch.tv (a video platform for gamers) live streaming
Technologies: Java, REST
- Updated news and timetable
- Activities planning (reminder notifications)
- Map of the event
- Twitch.tv (a video platform for gamers) live streaming
Technologies: Java, REST
Education
2009 - 2013
Bachelor's Degree in Software Systems in Telecommunications Networks
The Higher State College of Communications - Minsk, Belarus
Skills
Libraries/APIs
RxJava, Android API, RxJava 2, Retrofit, REST APIs, Google Maps, Parse SDK, Facebook SDK, Picasso, Android Universal Image Loader, Otto, Android Support Library, Firebase Android SDK, WorkManager API, NDK, Camera API
Tools
Android Studio, Android Jetpack, greenDAO, Mercurial, Git, Subversion (SVN), Jenkins, Android NDK
Languages
Java, Kotlin, C#, PHP, HTML, Swift, C++, C, Scala, SQL, JavaScript, GraphQL
Frameworks
Android SDK, Dagger, .NET Compact, Dagger 2, React Native, LibGDX, Cocos2d-x, Ktor, KOIN
Paradigms
Mobile Development, Unit Testing, Model View ViewModel (MVVM), Cross-platform, REST, Dependency Injection, Functional Programming, Functional Reactive Programming, Behavior-driven Development (BDD), Test-driven Development (TDD), Clean Architecture
Platforms
Android, HubSpot, J2ME, Windows Mobile, Firebase, iOS
Storage
Realm, MongoDB, SQLite, Compose.io
Other
Mobile App Development, Mobile Apps, Google Material Design, OkHttp, Observer Pattern, Room, CI/CD Pipelines, Jetpack Compose, UI Testing, iBeacon, OAuth, Coroutines, Kotlin Multiplatform, Full-stack, Apollo, Android Interface Definition Language (AIDL), Java Native Interface (JNI), Full-stack Development, Geofencing, Location Services and Maps, Performance, Minimum Viable Product (MVP), Hilt, Android Foreground Services, IPC, Image Recognition, Software, Fintech, Bluetooth
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