You asked
Who can see our data?
The short answer
Only you. Access is set by role, so a judge, a clerk, and a treasurer each see what their job needs, and no outside company can read any of it.
The data is encrypted on your own hardware, and only you hold the keys. Sensitive actions need a sign-off before they are final.
Every access rule is your government's to set, and every approval is itself a sealed record, so it is always clear who authorized what.