Ich bin Johannes, ein freiberuflicher Senior Android Entwickler. Ich habe mich auf die native Android-Entwicklung mit Kotlin spezialisiert und biete auch plattformübergreifende Entwicklung mit Flutter für Android, iOS und Web an.
Ich lege großen Wert auf sauberen und gut strukturiertem Code und auf gründliches Testen, um dessen Qualität sicherzustellen. Meine Expertise umfasst unter anderem Android, Kotlin, Flutter, Coroutines, Jetpack Compose, RxJava, Dagger/Hilt, Koin, Epoxy, Room, Google Pay, BLE, Firebase (Firestore, Auth, ML), Stacked, Google Maps und MapBox.
Rescuetrack - 2023-2024 (3 months)
Converting first responder app from MVP to Jetpack Compose and creating and implementing a new UI for the app.
Accenture - 2021, 2022, 2023 (1 year 11 months)
Implementing and improving the hotel booking app from Motel One. I have already been commissioned 3 times.
Adevinta - 2022 (9 months)
Implementing tasks for the Privacy and Trust and Safety team and converting legacy code to Jetpack Compose.
Bosch Sensortec - 2021-2023 (2 years)
Implementing a flutter app for Android and iOS which detects gases using AI.
Sinner Schrader - 2021 (3 months)
Implementing a remote health doctor app for ADAC including video call features.
Mobimeo - 2021 (3 months)
Implementing tasks like 3D secure for the Payment team in a mobility app.
BRITA GmbH - 2020-2021 (6 months)
Implementing a BLE app to measure the water usage of jugs. And notify users, when the filter needs to be changed.
AIVITEX GmbH - 2020 (5 months)
Implementing a video call app with AI features using Firebase ML Vision.
Reach Now - 2018-2020 (1 year 4 months)
Implementing Google Pay with Braintree payment provider and an UI-Components library.
Moovel - 2016-2018 (2 years)
Implementing a driver app, for an on demand shuttle service. Navigation and on- and off-boarding off passengers.
EnBW AG - 2015-2016 (5 months)
Implementing an app, which controls smart heating systems for offices using AI.
ProSiebenSat.1 - 2015 (3 months)
Implementing tracking and analytics libraries for a video streaming app and refactoring.
United Navigations - 2015 (7 months)
Implementing an outdoor navigation app for hiking, biking and other outdoor activities.