1.16Where MuleSoft development happens

Historically you'll hear constantly about:

Anypoint Studio

It's the Eclipse-based Mule IDE.

MuleSoft's newer development path also includes Anypoint Code Builder. MuleSoft's current official tutorial uses Code Builder to design an API, implement it, test locally, deploy it to CloudHub 2.0 and monitor it with Runtime Manager.

So don't get confused if the interviewer says either:

Anypoint Studio

or:

Anypoint Code Builder

Your job experience may still be heavily Studio-based.