Hi how are you im an expert in Android and iOS apps, i ahve more than 8 eyars experience developing software, im a fullstack developer so i do web and mobile also backend programing like api's.
Please visit my portfolio to see my past work, you can find it in my profile.
If you coould give me more details about the app, i can tell u a more exact time frame.
Thank you for your time and have a great day.
Take care