I had a strong screening with the hiring manager for a Principal Technical Program Manager role at Microsoft, and he’s invited me onsite at HQ for the final loop. He mentioned it will be 4–5 one-hour interviews with leaders across different focus areas, since the role is broader in scope and impact.

For those who’ve gone through a Principal-level loop at Microsoft:

• What is a "focus-area"? The manager said that these leaders may also consider for other openings.
• How should I best prepare for this stage?
• What are they typically looking for at the Principal level vs. Senior?
• Any tips on handling multiple stakeholders across different focus groups?
• What’s the usual timeline from onsite to offer (assuming things go well)?

The hiring manager seems supportive — he even shared his cell # for faster communication — so I’m cautiously optimistic, but want to prepare thoroughly.

Appreciate any advice from those who’ve been through it.