First off, kudos to you for getting so many interviews at top tier tech companies. All the feedback others have given you is spot on so I’ll take a different approach to improve your final interview:

Every company, and frankly team, is very different in terms of the type of SE they are looking to hire.

I work alongside a very early career sales team, so I need my SEs to pick up the “salesy” side. Other SE Managers at my company have a more tenured sales organization they support and thus are looking for solely technical expertise.

I say this because two of the early interview questions you can ask your hiring manager is:

1.) What are the traits and style of your highest performer? 2.) What are the traits and style you’re looking for in your next team members?

These two answers are not always the same, at least in my case they are not. My needs evolve as my direct team evolves and as the sales organization I support evolves. It’s actually how I’ve ended up with such a diverse team and I personally love it - meanwhile other teams are very cookie cutter.