September 2022 Summaries

Firebase App Distribution is now generally available, offering developers a streamlined way to distribute pre-release iOS and Android builds to trusted testers before public launch. The service improves tester management through access-controlled groups, bulk additions and removals via the Firebase console, CSV imports, and public API endpoints. Release links help direct testers to specific builds, while optional Android and iOS SDKs provide in-app alerts when newer test versions are available. Developers can also automate build distribution and tester management in CI/CD workflows using the Firebase CLI or fastlane, helping teams keep testers on current releases and reduce manual release-management work.

Cloud Storage for Firebase Security Rules now support cross-service access to Firestore data through `firestore.get()` and `firestore.exists()`, enabling developers to centralize authorization logic such as group membership and friend-based photo sharing without server-side workarounds. These functions can read only Firestore documents in the same Firebase project and require fully specified Firestore paths, while transaction-oriented variants such as `getAfter()` and `existsAfter()` are not supported. Enabling the feature requires Firestore and Cloud Storage to be configured and grants the Storage service account permission to read Firestore documents, with support available in Firebase CLI and Emulator Suite version 11.10.0 or later. Each unique Firestore document lookup incurs a Firestore read charge and can add latency, especially when services are geographically distant, although repeated accesses to the same document are cached within a request. Rules evaluations are limited to queries for two unique Firestore documents, and the feature can be tested through the Emulator Suite or Firebase Console Rules Playground, with emulator-based automated testing recommended for production rules.

Andrew Rowland, founder and CEO of Classkick, drew on his experience teaching high school math and robotics in Chicago to create a platform designed to increase student “aha” moments and strengthen teacher-student relationships. Classkick functions as a digital notebook where teachers can view student work in real time and provide support through chat, audio messages, or handwritten annotations, enabling substantially more feedback than traditional classroom methods. Built by a small team for use across platforms and by educators with varied technology experience, the app adopted Firebase to manage real-time collaboration, scalability, and shared iOS and web functionality without developing complex infrastructure in-house. As Classkick expanded to serve users in more than 180 countries and over half of U.S. schools, it used approaches such as sharding to accommodate increased traffic while maintaining live, collaborative interactions.