Make sure that you employ the best mobile app development company and tell them your requirements and expectations so that they will ensure that everything is taken into consideration and nothing is left.
Here are some tips that will help you to develop a secure app for your users-
1.Collaborate with the best security team
2.Make sure you take the testing part serious
3.Data encryption is all that user will expect
4.High-level authentication is what everyone wants
5.Hire the best app development company