Hello there!
this app would save lives and help people react better at stressful situations
so is it gonna be for both ios and android?
there would be 3 apps:
1-for patients where they can explore data about the disease, call emergency, etc.
the second for doctors and hospitals to post about diseases and check if there were any emergencies around
and the third for admin to monitor all data
for DB, I'll use Firebase Firestore which is fast, secure, and supported by Google.
also for authentication and sending verification codes, Firebase auth would be a good one.
for the Navigation part, Google maps API is my choice as it's accurate and fast.
By the way, we are a team of experienced programmers and we'll support your app for the next 6 months after it's done in case of any bugs