Oleksandr Rabinovych
Verified Expert in Engineering
Android Developer
Oleksandr has developed many sophisticated Android projects as well as some web projects and apps for embedded systems. He is a talented, creative expert in his field who loves tasks requiring lateral thinking. He is also a quick study who loves tackling new tech. At the same time, Oleksandr is an easy-going and understanding person which greatly contributes to an enjoyable and cooperative work atmosphere when working with others.
Portfolio
Experience
Availability
Preferred Environment
Mercurial, Git, Eclipse, Android Studio, Linux
The most amazing...
...project I've worked on was an Android client for a service which uses artificial intelligence to transform boring camera videos into exciting movies.
Work Experience
Senior Android Developer
iwinBACK Sales Inc.
- Helped develop a protocol for client-server communication for the mobile app.
- Developed an Android app to capture and sync SMS/call data.
- Gave feedback on the database structure to improve its maintainability.
Android Developer
HypeLabs (via Toptal)
- Developed an Android SDK in Java for creating mesh networks via BLE for facilitating internet transactions by devices with limited connectivity.
- Implemented device disappearance and internet connectivity state propagation via a mesh network.
- Stabilized the Java codebase by improving its thread safety.
Android Developer
Stilling
- Created an app that allows technicians to find a car's model from the catalog or its license plate and then order parts for it.
- Supervised the work of an intern developer who covered the project with tests and added some new functionality.
- Integrated the Phrase service to maintain the app's translation into more than 10 languages.
- Created an app for Zebra tablet that is able to scan products' barcodes and make an order via the shop's API.
Android Developer
PrivateWifi
- Developed an app in Kotlin from the ground up that changes the client's DNS address and demonstrates the data compression capabilities of the company's service by playing YouTube videos.
- Maintained an SDK for making apps that connect to the company's VPN.
- Maintained documentation for the above-mentioned SDK's API.
- Refactored the source code for an app that helps to reduce users' mobile traffic.
- Debugged and added new functionality for different flavors (brandings) of the company's Android app for connecting to their VPN based on network conditions—mobile data, secure and insecure WiFi.
- Updated the apps' target API level to meet the requirements of Google Play.
Android Developer
Starlink Pharma SAS (via Toptal)
- Added a few features (including barcode scanning functionality) to an existing Android app.
Kotlin Android Developer
Momentstudios
- Added new features to two existing Android apps.
- Incorporated Jetpack libraries into project.
- Integrated dependency injection framework (Dagger2).
- Helped to migrate from Realm to RoomDB.
Freelance Android Developer with Strong Cryptography Experience
NDA Client (via Toptal)
- Implemented an Android app from the groundup to deal with Ethereum transactions.
Freelance Android Developer
Rehash, LLC (via Toptal)
- Created custom Android component (Draft.js editor) for React Native.
- Fixed bugs in a React Native app.
Freelance Mobile App Developer
POMCO (via Toptal)
- Refactored an Android app.
- Updated the UI and added animations.
- Improved reliability of the Bluetooth connection.
- Added support for the newest Android versions.
Freelance Android Developer
Codecacao (via Toptal)
- Enhanced and supported the existing Android app.
Android Developer
NearGroup
- Supported an Android messenger app.
- Fixed chat latency and connection reliability issues.
Android Developer
UP Project Developments
- Developed a voice recorder from scratch.
- Built a simple Material Design UI.
- Facilitated the auto sending of recorded files via SMTP.
Freelance JavaScript Expert
MICA (via Toptal)
- Supported user scripts for automating work with Google Spreadsheets.
- Added new features using GAS.
Android Developer
Confidential Company
- Supported an Android client app with embedded photo taking and recognition.
Freelance Android Developer
BioMetrix (via Toptal)
- Created an Android app (from scratch) that communicated with peripheral devices via Bluetooth.
- Contributed to the creation of the UX and design for the app.
- Implemented a time-synchronization protocol with a 10-millisecond precision.
- Implemented BT communication data recovery logic.
Android Developer
Yalos
- Supported an Android app that shows funny animated reminders about missed calls, events, emails, IMs, and more.
Android Developer
Cong
- Created an Android mobile client application for a playlist management web-service.
- Implemented a custom design.
Freelance Android Developper
Uprise (via Toptal)
- Created an Android app for data visualization from scratch.
- Used a chart graphical library to display data from weather stations.
Freelance Android Developer
MCProHosting (via Toptal)
- Fixed bugs and added a new functionality to an Android client for viewing live streams.
- Added RTMP video-streaming support.
- Changed the existing UI to make it compliant with the material design.
- Helped to integrate the app with Google Cast.
Android Java Developer
Jank Studios
- Developed a social media app for Android.
- Integrated Facebook, Twitter, and Instagram networks into the app.
Android Java Developer
Raul Marco (Private Customer)
- Created an app for picking assigned locations for your contacts on your Android device.
Android Java Developer
ActiveHealth
- Added modifications to an existing open-source Android app to change its behavior.
- Redesigned the brand for the above mentioned app.
PhoneGap Developer
Yevhen Teneta (Private Customer)
- Created a prototype of an animated audio-book reader app for Android and iOS using PhoneGap.
Java Developer
ELEKS Software
- Developed a web app that manages cloud computers from AWS; this involved using J2EE/Spring stack for the back end and HTML/JavaScript/CSS for the front end.
- Created a mobile app for contacting people inside a company using Scala for Android.
- Supported an Android time-tracking app using Java and SQLite.
- Built an Android market-type app using Java and implementing Material Design.
- Maintained and tested PDF-rendering component of a web-service using Java.
- Supported a Blackberry legacy time-tracking project using J2ME.
Java Mobile Developer | Lua Developer
GlobalLogic
- Developed a smart-card emulator for Blackberry smartphones using Java ME.
- Created a UI framework for TV applications with Lua script.
- Built a testing framework using Lua.
- Wrote unit tests for a framework running in an embedded system.
- Developed the UI and business logic for a native Android app related to video processing.
- Debugged and modified a Bouncy Castle library for working with cryptographic entities.
- Created a video-player demo application with Lua scripting.
Experience
Magisto
https://play.google.com/store/apps/details?id=com.magistoBeam
The work included working with WebSockets, using 3rd-party library to view RTMP streams, adding a functionality that required an integration with new server APIs, and changing the app's UI to implement Material Design.
My client and end-users were satisfied with the app and the app's rating has increased since I worked on the project.
Aggreg8
I implemented the app applying Material Design guidelines and the latest API guides suggestions. I integrated Facebook, Twitter, and Instagram APIs in a way that allowed me to manage them uniformly. The project required managing background tasks and using a SQLite database.
It was a really nice experience.
Contacts Location
iEnigma
My role was to develop the Blackberry client.
Android SDK for Creating Mesh Networks
https://github.com/Hype-Labs/uplinkI was an Android developer on the project and implemented device disappearance propagation, internet connectivity detection, and propagation. I also stabilized the project by adding thread-safety and improving BLE communication synchronization.
Skills
Languages
Java 8, XML, Java, Google Apps Script, GraphQL, Kotlin, HTML5, SQL, Pascal, Bash, HTML, JavaScript, Java SE, Delphi, Scala, Lua, CSS, XHTML, TypeScript, Flavors, Zebra Programming Language (ZPL)
Frameworks
Rx, AndroidAnnotations, ORMLite, JUnit, PhoneGap, Dagger 2, Glide, Bootstrap, Draft.js, JPA, Spring JDBC, Spring MVC, Spring, Jakarta Server Pages (JSP), Turn.js, Media Players, PowerMock, Mockito, Android SDK, React Native
Libraries/APIs
RxJava 2, Retrofit 2, REST APIs, Android Universal Image Loader, AsyncTask, Google Gson, GSON, Android Support Library, LiveData, DBFlow, RxJava, MPAndroidChart, Butterknife, jQuery, Instagram API, Twitter API, Twitter SDK, Parse SDK, Facebook Open Graph API, Facebook SDK, SAX, Retrofit, AES, Apache HttpClient, Amazon API, Google Places API, Java Servlets, Quartz, Mobile HTML5, Google Maps, Google Maps SDK, OpenSSL, BouncyCastle, AtomPark SMS API, Android API, Web3.js, Robospice, WorkManager API
Tools
Android Studio, Google Sheets, Java Concurrency, Google Docs, Chrome Developer Tools, Eclipse IDE, Android Jetpack, Logging, Jira, Subversion (SVN), Notepad++, Git, 9-patch, Mercurial, Microsoft Word, TortoiseSVN, VirtualBox, GitHub, Spreadsheets, Mongoose, Amazon EBS, Apache Tomcat, Servlet, Javadoc, Adobe Photoshop, Amazon Simple Email Service (SES), Cron, FreeMarker, Microsoft Excel, Wireshark, VPN, Phabricator, Gradle, Trello
Paradigms
RESTful Development, REST, Concurrent Programming, Generic Programming, Asynchronous Programming, Model View ViewModel (MVVM), Mobile Development, Functional Programming, Object-relational Mapping (ORM), Model View Controller (MVC), Unit Testing, Real-time Messaging Protocol (RTMP), Model View Presenter (MVP), Reactive Programming, Model View Intent (MVI), MVC Design, Testing, PKCS, Manual Testing, Agile Software Development, Scrum, Android Material Design
Platforms
JSE, Android, Android Oreo, Firebase, Linux, Linux Mint, Mobile, Parse, Java ME, Eclipse, Twitter, Ethereum, Amazon Web Services (AWS), Windows XP, Windows, BlackBerry, Amazon EC2, Java EE, Bluetooth LE
Storage
Realm, SQLite, JSON, RoomDB, Relational Databases, Databases, MySQL, PostgreSQL
Other
Android Data Binding, Debugging, Layout, EventBus, Memory Profiling, DOM, SMTP, Ajax, HTTPS, HTTP, Dom Manipulation, VCS, Google Material Design, Cordova, Android Animations, Apps, Writing & Editing, Mobile UX, Documentation, Encryption, Cryptography, Asymmetric Encryption, HTML Email, Email, HTML Parsing, Facebook, Instagram, HTTP Live Streaming (HLS), Accessibility, Animated GIFs, XMPP, Audio Recording, QR Codes, UI Animation, Audio Streaming, Android Camera App, Image Manipulation, MPch, EclipseLink, Video Capture, Video & Audio Processing, Video Editing, Videos, PDF, PDF Design, Checksum Calculation, Audio, Push Notifications, Digital Signatures, SSL Certificates, RSA, SSH, Bluetooth, DTD, RTMP, Video Streaming, WebSockets, SMS, Cryptocurrency, Cryptocurrency Payments, Coroutines, Widgets, SVG, Barcode Reader, Phrase, Mobile App Development
Industry Expertise
Telecommunications
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