I have a final interview with the CTO of a small startup after being referred by the CEO. How do I ensure I get hired for the role?

It’s an opportunity role which means it’s not posted on the website. CEO has been quick to reply to my emails when I updated her — so far talked to HR and now the CTO next week.

I have a final interview with the CTO of a small startup after being referred by the CEO. How do I ensure I get hired for the role?
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