State ManagementMistakes Are Hard to RevertLong Tail of Old App VersionsDeeplinksPush and Background NotificationsApp CrashesOffline SupportAccessibilityCI/CD & The Build TrainThird-Party LibrariesDevice and OS FragmentationIn-App PurchasesNavigation ArchitectureLocalizationModular ArchitectureAutomated TestingManual TestingPlanning and Decision MakingShared ArchitectureScaling Build & Merge TimesMobile Platform LibrariesAdopting New LanguagesKotlin Multiplatform and KMMCross-Platform DevelopmentWeb, PWA & Backend-Driven AppsExperimentationFeature Flag HellPerformanceAnalytics, Monitoring and AlertingMobile On-CallAdvanced Code Quality ChecksCompliance, Privacy and SecurityClient-Side Data MigrationsForced UpgradingApp Size