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Tinna Demiraj

@tinnademiraj

Android Developer at OpenResearch GmbH building infraDOAS, including real-time MQTT messaging for Austrian Federal Railways.

Kosovo

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At OpenResearch GmbH, I develop infraDOAS, an Android application for Austrian Federal Railways (ÖBB) railway operations. I work on timetable, document, and electronic order features using Kotlin, Jetpack Compose, and MVVM.

I implemented real-time MQTT messaging for driver advisory information and offline document support with local caching and integrity checks. I’ve also improved reliability through crash fixes and time synchronization retries, and added tests for asynchronous flows and failure cases.

At LinkplusIT, I developed native Android applications and frameworks in Kotlin and Java. I also built Orderbit, an Android app connecting pharmacies and pharmaceutical suppliers, and contributed bug fixes, audit logging, and automated tests to an iOS application in Swift.

Experience

Work history, roles, and key accomplishments

Current

Android Developer

Current

OpenResearch GmbH

Dec 2021 - Present (4 years 11 months)

Developed railway timetable, document, and electronic order features for infraDOAS, an Android application for Austrian Federal Railways (ÖBB). Implemented real-time MQTT messaging, offline document support, and automated testing.

Kotlin Jetpack Compose MVVM Coroutines Flow MQTT REST APIs OpenAPI Junit Mockito JaCoCo Azure DevOps Fastlane Firebase App Distribution Swift

Android Developer

LinkplusIT

Mar 2019 - Dec 2021 (2 years 9 months)

Developed native Android applications and frameworks in Kotlin and Java using MVP and MVVM, integrating REST APIs with Retrofit, local storage with Room, and Firebase services. Collaborated with cross-functional teams in a Scrum environment.