Josipa Mrsa

- Currently developing a multiplayer module for a Tetris-like game, using Kotlin for Android for frontend and Express.js for backend, leveraging the SocketIO library to implement real-time communication - Currently working on a React Native product with emphasis on digital finances - Worked on a Anki-style educational quiz application, built with React Native and Expo - Built a small ticketing system with React and mobile-first approach, based on McDonald’s number ticketing system

- Worked on a music-focused social media platform using Kotlin, Android SDK, following Clean Architecture and MVI design pattern - Developed complex, mostly media based UI features and animations with ExoPlayer, authentication (regular and third-party with Google and Facebook sign-in), in-app notifications system with Firebase and Retrofit, and a paid subscription system - Closely collaborated with product, QA and design teams on business decisions, using agile methodologies

- Maintained the existing client and developed new features for an eSports social media platform PlayHera - Added or improved features such as app dashboard, newsfeed, tournament overviews, and built a digital items shop - Improved real-time notifications, chat functionality, and resolved critical crashes - Built features with Kotlin, Android SDK, adhering to Clean Architecture principle and the MVVM design pattern, and also used standard libraries such as Retrofit, Gradle, Firebase, Kotlin Coroutines...

- Worked with EDR platforms (Crowdstrike, Cybereason) to manage client infrastructures and consulted clients on security issues and improvements - Maintained and regularly reviewed security policies and rules for clients - Automated various processes regarding reports with scripts and internal tools with Python and Crowdstrike’s API - Participated in pentesting of network infrastructures, by applying OWASP methodology and various tools for application pentesting (BurpSuite, NMAP, Kali Linux, Metasploit...)