works on mainting and fulfilling request of the client

further info at interview

5+ years professional experience developing software for iOS or MacOS using either Swift, Objective-C or C++ languages
2+ years of experience of developing mobile applications using flutter development kit.
UI and UX experience
Proficiency with 2D and 3D graphics frameworks
Adept with benchmarking and modification
Proficiency with offline storage, threading and performance tuning
Have published one or more iOS apps in the app store
Experience working with iOS frameworks such as Core Data, Core Animation, Core Graphics and Core Text
Experience with third-party libraries, APIs, and Push Notifications