User retention is one of the biggest challenges faced by Android developers. Once an app is built and published, acquiring users is only half the battle, but the real challenge is keeping them engaged. I delved into how Firebase Cloud Messaging (FCM) can improve user retention in Android apps by covering FCM integration, crafting effective messages and leveraging Firebase's ecosystem to deliver the right message to the right user at the right time. The audience also learned how to use analytics to segment the user audience, trigger context-aware messages and measure campaign impact.