Senior Android Developer

I develop infraDOAS, an Android application supporting Austrian Federal Railways (ÖBB) operations. I build timetable, document, and electronic order functionality using Kotlin, Jetpack Compose, MVVM, Coroutines, Flow, and OpenAPI-generated REST clients.

I implemented real-time MQTT messaging for driver advisory information, including protocol validation, connection monitoring, and timeout handling. I also added offline document access with local caching, SHA-256 integrity verification, and validity-date checks.

I improve application reliability through crash fixes, exponential retry backoff for time synchronization, and structured audit and technical logging. I write JUnit and Compose UI tests for asynchronous flows, state changes, and failure scenarios, helping maintain more than 92% coverage with JaCoCo.

I extend Azure DevOps CI/CD pipelines for customer-specific builds and support distribution through Fastlane and Firebase App Distribution. I collaborate with QA, backend developers, and clients, review code, and contribute Swift fixes, logging, and automated tests to the iOS app.

I built native Android applications for multiple client projects using Kotlin and Java, applying MVP and MVVM architectural patterns.

For Baker Tilly, I developed an invoice-scanning application that allowed users to sort invoices in the app, authenticate with individual credentials, and associate user accounts with company accounts.

I integrated REST APIs with Retrofit, implemented local data storage with Room, and used Firebase services. I worked in a Scrum team alongside designers, engineers, QA specialists, and product managers to develop and test product features.

I designed and built Orderbit, an Android application that connected pharmacies with suppliers.

The application supported ordering workflows and inventory updates between pharmacies and their suppliers.

I built two companion appointment scheduling applications.

One application enabled clients to book appointments, while the other enabled businesses to review, accept, or decline appointment requests.

Bachelor of Science in Computer Science, Faculty of Mathematics and Natural Sciences.