[999900000999]

This feels a bit too vague for anyone to give you advice on.

Do you want to build enterprise apps. Do you need advice on using React Native vs Flutter vs Swift ?

Do you want advice on actually building a SASSS business?

[xwowsersx]

No, OP said: " things that worry me about this space are security best practices, providing features like corporate single sign on and handling data that customer[s] expect to be healed [handled] very securely."