How to hire

Hey there, having been burned a few times by web developers (not wordpress) I was wondering if anyone had any tips on how and where to hire a word press developer?
What would I be looking for to assess ability?

The site is built and complete, and I would like a developer to give it a second view from a UI/UX, security and connection to other apis perspective – essentially an audit with some tweaks if a need is identified.

Im uk based if that makes a difference.
TIA

 

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