Good afternoon, I have been an Android application developer for more than 6 years, so for the product it is economical both in its production and in its maintenance, I propose you, a native Android app (Java or Kotlin) you choose, Java gives more performance but since the app is so small, the difference could not be noticed and kotlin in easier to program in case of maintenance there are more people who could provide it, at a lower cost, since kootlin is easier to program, the database It would be Firebase, which is NOSQL but in the amount that will be used is free as well as the service of sending emails for when 100 users are reached, the file is automatically sent to a programmable sender, a double layer backup system to keep the data in the cloud and in the terminal, safe and a mobile management system and another one in case you need it directly through firebase, the design of colors and logos is according to your brand image, the cu When we decide if you select me, I hope we can work together on this project.
1 month warranty that includes small changes in case they are required, ie changes that do not involve more than 10% of the development and immediate support in case of any error.
Changes greater than 10% after the app is delivered imply additional costs.