Gergely Korossy
Android, Kotlin Multiplatform, Compose Multiplatform developer
I'm a passionate Android engineer with nearly ten years of experience designing, developing, and maintaining high-performing mobile applications. I have a deep understanding of the Android development landscape and a proven ability to deliver innovative solutions. I also enjoy mentoring other developers.

Experience

2024 - Present
Senior Android developer
—
Compose, Kotlin Multiplatform, Ktor, Firebase
Pulselive
  • Developed and implemented key features for the new Premier League Android app using Kotlin Multiplatform to share code across platforms.
  • Built engaging and seamless user interfaces utilizing Jetpack Compose.
  • Created new core features including remote syncing, local data storage, and parsing JSON data.
  • Implemented server-driven user interface (SDUI) for dynamic screens.
  • Leveraged technologies such as Ktor and Firebase.
  • Contributed to a positive and collaborative team environment.
2022 - 2023
Senior Android developer
—
Compose, Google Maps, Firebase, CameraX, Services
Hubstaff
  • Contributed significantly to the development and successful release of a new version of the Hubstaff time tracker application for Android.
  • Implemented features using core Android technologies including Kotlin, Jetpack Compose, Google Maps, Firebase Cloud Messaging, CameraX, and foreground services.
  • Focused on creating a polished and user-friendly experience.
  • Collaborated with cross-functional teams to deliver project goals.
2017 - 2021
Senior Android developer
—
Compose, Firebase, CameraX, NFC, ExoPlayer
HelloPay Zrt.
  • Developed a diverse range of Android applications using Java and Kotlin, including a POS kiosk, restaurant system, NFC card handler, and QR code voucher redeemer.
  • Integrated CameraX and ML Kit for features like QR code scanning.
  • Implemented NFC functionality for card handling.
  • Gained experience with ExoPlayer for media playback.
  • Additionally, developed web applications using React, Spring Boot, and PostgreSQL.
2015 - 2019
Co-founder & Developer
—
Java, SQLite, PHP, AWS
Edukado Publishing Ltd.
  • Co-founded a startup focused on digital textbook publishing.
  • Led the design and development of the Android application using Java, Fragments, and SQLite.
  • Built the backend solution utilizing PHP, MariaDB, and AWS.
  • Contributed to all technical aspects of the product's development as a founding member.
2012 - 2014
Android developer
—
Java, Fragments, WebView
AutSoft Kft.
  • Developed an Android digital history magazine app optimized for both phones and tablets.
  • Created an Android application for an insurance company.
  • Leveraged Java, Fragments, and custom WebView solutions to enable shared code execution on Android and iOS devices.

Education

2014 - 2017
Master's in Software Engineering
Budapest University of Technology and Economics
2009 - 2014
Bachelor's in Computer Science
Budapest University of Technology and Economics

Contact

Budapest, Hungary
Contact me
korossy.me
medium.com/@gregkorossy
github.com/gregkorossy
linkedin.com/in/korossyg
stackoverflow.com

Skills

Programming Languages Kotlin, Java, Javascript, PHP, SQL
Android Development Android SDK, Jetpack Compose, Coroutines, Flows, MVVM, Room, Datastore, Retrofit, Fragments, CameraX, ML Kit, NFC, Bluetooth, Material Design, Android Studio
Multiplatform Development Kotlin Multiplatform, Compose Multiplatform
Backend/Other Ktor, Firebase, Server-Driven UI (SDUI), SQLite, Spring Boot, PostgreSQL, MariaDB, AWS, HTML, CSS, JSON, Version Control (Git), JIRA
Architecture & Concepts Clean Architecture, RESTful APIs, Remote Syncing, Local Data Storage, JSON Parsing, WebView Solutions, Server-Driven UI (SDUI)

Interests

brick
collecting LEGO
movie
watching movies
travel_explore
traveling
videogame_asset
playing video games