Sebastian Kaspari
Principal Engineer, Mobile at League
Passau, Bavaria, Germany
Summary
🤩
RockstarSebastian Kaspari is a Principal Engineer specializing in mobile platforms with 17 years of professional experience and over two decades of hands-on software work. He architects and ships large-scale Android apps, frameworks and developer tooling, currently driving cross-team mobile platform efforts for League’s digital health products. Previously at Mozilla he founded and scaled the Android Components project and played a core role in the rewrite and delivery of Firefox for Android and Focus, contributing to crash reporting, telemetry, CI/CD and multi-channel release pipelines. His background spans embedded automotive apps, consumer mail clients and web backend work, giving him a rare full-stack perspective on mobile product engineering. An active open-source contributor, he has deep experience integrating Android builds with complex ecosystems like Mozilla’s gecko and Android Components. Based in Passau, Germany, he combines product-focused architecture with practical DevOps and QA improvements that keep large mobile codebases healthy and releasable.
16 years of coding experience
20 years of employment as a software developer
German, English
Stackoverflow
660reputation
52kreached
17answers
2questions
Github Skills (43)
kotlin10
android-gradle-plugin10
webview10
mobile-development10
ui-components10
ui-design10
interface-design10
android-development10
android-components10
java10
javas10
android-component10
android10
android-webview10
android-ui10
Programming languages (14)
Github contributions (5)
mozilla-mobile/focus-android
Dec 2016 - Dec 2021
⚠️ Firefox Focus (Android) moved to a new repository. It is now developed and maintained as part of: https://github.com/mozilla-mobile/firefox-android
Role in this project:
Mobile Developer (Android)
Mobile Developer (Android)Contributions:35 releases, 198 reviews, 999 commits in 5 years 1 month
Contributions summary:Sebastian primarily contributed to the development and improvement of the Firefox Focus Android application. Their work included implementing new features, such as the integration of the Share dialog and support for handling content and new browser actions. They also focused on enhancing the user experience through code improvements, UI adjustments, accessibility enhancements, and bug fixes, such as properly handling screen rotation events and fixing incorrect menu positioning.
firefoxbrowserprivacyfirefox-androidandroid
mozilla-mobile/firefox-android
Dec 2016 - Dec 2021
:warning: This repository hosts the Firefox for Android (Fenix), Focus for Android, and Mozilla Android Components projects. It is now developed and maintained as part of Mozilla Central. See the announcement here: https://github.com/mozilla-mobile/firefox-android/wiki#upcoming-migration-to-mozilla-central. ”
Role in this project:Mobile Developer (Android)
Mobile Developer (Android)Contributions:2528 commits in 5 years 1 month
Contributions summary:Sebastian's commits focused on the development of the Firefox for Android application. The contributions include merging browser engine changes, such as those for gecko-beta and gecko-nightly builds, and implementing features, such as those for the web app manifest and managing web view events. The code modifications span multiple files across various components of the Android application. Changes to the tests have been observed, indicating involvement in quality assurance and testing.
firefoxhostsandroidandroid-componentsfirefox-for-android
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