Overexpectations. How is this even related to Wordpress? DDoS is something nobody can do anything about. It takes big datacenters and thousands of dollars for that. The maximum a Network Technician could do is setup firewall rules and some router rules. This is still not expected from a Wordpress Developer.
Technically, a piece code can never be perfect.
Good written* english you meant?
I won’t comment here because you mentioned “Bonus”.
Since you mentioned a range and not a fixed salary which is fine, I’ll assume you’re offering an average salary of $2000 of a mid level Wordpress Developer. That’s around $10 an hour for a full time job. I’m sorry but there’s no way you’re finding a skilled developer for that salary.
What I can recommend is, rather than looking for someone on a full time basis, it is unlikely that you will find anyone “skilled” enough to match your expectations. You should rather hire someone on per project basis and pay him/her on a fixed or an hourly price.