By any chance, are you looking to purchase ready made applications?
Kindly let me know the topic of the required applications. What types of business applications you are looking for?
I am having sound expertise with :
Native IOS, Objective-C; Swift; OOP, MVC, main design patterns, DB engineering; Apple's Xcode IDE Frameworks and APIs like Foundation, UIKit, and CocoaTouch; iOS 10 and newer OS versions. A Git code repository technology.
Android SDK; OOPS; XML; JSON;
Java (UI, working with database, Java Applets, multithreading, client-server interaction via TCP/IP), ASM
Html5, Bootstrap, CSS3, Ajax, XML, JSON, JQuery, WebAPI
Already I have design and build many simple to complex level android and iOS applications. Please initiate a chat to have further discussion.