macOS App Reverse-Engineering Enhancement

I have a macOS desktop application that I legally own and use for personal projects. I now need to delve into its internals so I can extend—or optionally disable—some built-in limitations and add new features that are not offered by the vendor... (Budget: ₹600 - ₹1500 INR, Jobs: Binary Analysis, C++ Programming, Cocoa, Mac OS, Objective C, Reverse Engineering, Software Development, Swift)