Android Developer in Berlin, Germany

Thousands of people use this app as the primary source of information on motorsport championships with races on all continents listed.
As the Android engineer, I participated in all phases of the project from visioning, architecture design, sprint plannings, app development, and A/B testing and feature discovery live at the races. The app's core feature is a custom map, implemented with markers, polygons, and polylines, which represent different areas and points of interest in the venue area. A custom CMS system was developed to provide a dynamic solution for map attributes that works for all the venues and all the platforms (Android, iOS, and web).
Other features include live race results (implemented with WebSockets), live audio stream from drivers cockpits while the race is in progress, championship standings, and driver statistics.

This is a white-label project for sports betting released as four separate apps, each with its own design and functionalities. By creating a custom Gradle build configuration, each of the different apps could be built from the codebase. By organizing the codebase using clean architecture principles, main features such as adding bets to a bet slip, displaying and updating live events using WebSockets, and the video stream of live matches could be shared across the apps.
I created a custom deployment scheme that would publish each of the app's new version to a self-hosted web server. This was done by creating a custom script for CircleCI, providing the possibility to deploy a new version of the app by merging the master branch to an app-specific branch, with the new version name as the commit message.
The hardest thing about this project was implementing the live betting feature since all the information about the matches, bets, and odds were coming from a WebSocket server. I developed a mechanism to convert the WebSocket events to RxJava events, which helped provide a smooth UI experience. A lot of edge case states can happen in the course of a live match (connectivity issues, odds changes, bets expiring, and bets being added).

I developed and maintained apps for two of the biggest electricity and gas providers in the Netherlands. I was part of an agile team, all the planning and feature discovery phases, and occasional trips to client's offices in the Netherlands.
The apps were written in Kotlin; they followed clean architecture and MVVM with high test coverage. I helped implement a unique feature by modifying an opensource chart library to display energy consumption in real-time, with custom animations and the "endless scroll" functionality.
Other functionalities included:
• An option to pay your bills from the app.
• The ability to control your home thermostat.
• Live chat with a chat-bot and customer support.
• The option to enable redelivery of energy to the network with solar panels.