testing a site security

Hi
Some web developers are making a site for me.
As we manage a lot of personal information I'd like to get shure of 2 things:
-Is the data I'm requesting to my customers secure? This is, can someona easily brake the site to get personal information.
Is the site easy to put out of work, this is can someone willing to harm it make it down?

I've been trying to find some people doing this kind of test, but I'd appriciate recommendations from people at wht.

Have a nice day!

 

 

 

 

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