Drilon Reçica, senior mobile engineer
Senior mobile engineer, building for Android since 2012. I move large production apps from legacy architecture to modern Kotlin without stopping delivery, and I have taken a product from idea to launch across app, backend and infrastructure.
Fig. 1: the change I make to codebases, drawn as a dependency graph.
Three projects in detail: the challenge, what I did and what changed.
DB Regio (Deutsche Bahn), via AppDev GmbH, Nov 2023 – Present
Moving the Android app behind rural mobility in Germany onto a modern architecture and an accessible UI, while it keeps shipping.
Kotlin / Jetpack Compose / Coroutines / Flow / MVVM
DeenLabs GmbH, 2023 – 2024
Full technical ownership of a children's storytelling product: the apps, the backend and the infrastructure they run on.
Flutter / Dart / Deno / TypeScript / Coolify / RevenueCat
Open source, built at adorsys GmbH & Co. KG, 2015 – 2020
An open-source library for storing tokens and credentials safely on Android. 375 stars, 56 forks and millions of downloads.
Java / Kotlin / Android Keystore
Three employers since 2015. Client projects are listed under each.
AppDev GmbH, 2020 – Present
Large-scale public transport and retail apps, built in cross-disciplinary agile teams across Android, iOS and backend. Key role in modernizing architectures, migrating from MVP/RxJava to MVVM with Coroutines and Flow, and improving accessibility and UI quality. Multi-module development, white-label solutions and CI/CD for production apps with millions of users.
Architecture migration, a cleaner model layer and a WCAG accessibility rework.
Nov 2023 – Present
Retail app with Scan & Go: barcode scanning, payment and loyalty features.
Aug 2022 – Nov 2023
Ticketing and mobility services for the Rhein-Main transit region.
Jun 2020 – Aug 2022
DeenLabs GmbH, 2023 – 2024
Early-stage startup member. Led ideation, architecture and end-to-end implementation of Qisara: a Deno and TypeScript backend, infrastructure on a VPS with Coolify, and the Flutter app from scratch, including navigation, localization, payments and persistence.
A mobile product taken from idea to launch with full technical ownership.
2023 – 2024
adorsys GmbH & Co. KG, 2015 – 2020
Android apps in fintech and insurance, in agile interdisciplinary teams, with architectural setup in Kotlin and Java using MVP and MVVM. Built internal Flutter apps in 2019, maintained an open-source Android security library and mentored four working students.
Finance app with complex business logic and strict security requirements. Fymio ceased operations on 31 March 2020; its team announced that, despite intensive joint efforts, the product had not reached significant market relevance.
2015 – 2020
Insurance policy and claims management.
2015 – 2020
Open-source library for storing tokens and credentials encrypted on Android. 375 GitHub stars.
2015 – 2020
Four convictions, each one earned on a real project.
A rewrite stops delivery; a migration does not have to. On Wohin Du Willst the move from MVP and RxJava to MVVM with Coroutines and Flow happens inside a production app that keeps releasing.
Meeting WCAG on a public transport app is not a final polish step. It shapes components, navigation and testing from the start.
Multi-module codebases and white-label setups pay off when several teams build in parallel. Other apps are better served by a single, well-layered module. I choose the structure the project needs, not the one that is fashionable.
For Qisara I built the Flutter app, the Deno backend and the infrastructure. Knowing every layer makes me a better mobile engineer on large teams too.
Senior mobile and software engineer with 13+ years of professional experience, focused on Android, Flutter and modern backend systems. Started Android development in 2012 and grew alongside the platform, adapting to new architectures, tooling and engineering standards as the ecosystem evolved.
For personal and side projects I mostly use Flutter, to prototype quickly and ship to both platforms.
I work in German, English, Albanian.
Email is the fastest way to reach me.