​XCtest, OCMock, Objective-C, Gran Central Dispatch, Core Data, iAd, Game Center, Game Kit, Notification Center, Camera, Photo Library, Air print, Social framework, Maps, MapBox, GraphQL, Collection views, table views, auto layout, Air Drop, UIKit, Blocks, Multiple gestures, Core Graphics, Core Motion, xCode, Charles Proxy, Postman, Mitm,Design Patterns, Architectures, Swift, Multithreading, Realm, Alamofire, Promise, SwiftInjects, JSon, Rest APIs, Genericts, Protocol Programming, Functional Programming, Integration tests, UI tests, Unit Tests, TDD, Refactoring, Mentoring, Github, Git, Gitlab, Circle CI, Fastlane, Bitrise.