I am working as an IT teacher for several years. Before that, I was some years working in the private industry as a software engineer.
Some time ago, I created an app called “Apolo“, for the old PDAs with Windows Mobille (published on “Observatorio Tecnológio del Ministerio de Educación y Ciencia“).
Now, in my spare time I am developing a new version of “Apolo” for Android called “Teacher Gradebook“, I use it in my daily lessons and helps me to save time. I do not use paper notebooks anymore.
I have spent hundreds (maybe thousands) of hours to develop the app with thousands of line of code. I develop in my spare time when my family and job let me do it.
I do not get any external funds. I get funded with the app’s adverts and with users that want to become premium.