Create google custom search engine Android & iOS app

Google custom search engine is the free products to use the custom search within the website. We need to do custom css for the search results which is coming from google and it should be responsive for all devices which use our app. Also the search queries shall store in database.
Example: https://groupda.com/tg

Here the google cse embed code will be provided by me. The developer should handover the app source code to us and they should not reproduce or reuse the same.