• Used MVVM pattern
• Created EndPointConfiguration as protocol so it can be used mocked in testcases
• Then AlbumsRouter, PhotosRouter confirm to EndPointConfiguration
• Used Combine for async operation & binding viewmodals.
• To download Image created ImagesloadingModal where Dictionary is used to Cache downloaded images
• To hande multiple Image downloading used OperationQueue.
• Used Dependency Injection in all modal, router and PhotosVC.
• Test cases implementation.