Worked on the firebase/flutterfire repository to address a bug in the Firebase.initializeApp process related to demoProjectId handling. Focused on ensuring that when a demoProjectId is provided, user-supplied options and app naming are preserved, preventing unintended overrides by default demo configurations. Utilized Dart and Flutter to implement the fix, maintaining compatibility with existing Firebase initialization flows and introducing no breaking changes. Added targeted unit tests to cover the updated initialization path, reducing the risk of regression. This work improved the reliability and predictability of Firebase app initialization for demo projects, enhancing overall repository quality through focused, well-tested changes.