Access control is usually treated as a checkbox near the end. By then it is the hardest thing to add, because the whole system assumed everyone could see everything.

Built in from the start, it is straightforward. Every action asks a simple question first: is this user allowed to do this, to this record, right now. The answer is logged either way.

Least-privilege means people get exactly the access their job needs and nothing more. It is not about distrust. It is about limiting the blast radius when an account is compromised or a mistake is made.

The audit trail is the quiet hero. When something goes wrong, the gap between a five-minute answer and a five-day investigation is whether you wrote down who did what.