Fix an hacked website

I am looking for a skilled professional who can fix my custom-built website that has been hacked. The ideal candidate should have experience with custom-built websites and be familiar with resolving unknown issues caused by hacks. Additionally, it is important that the candidate is proficient in website security to ensure that the issue does not occur again in the future. It is also necessary for the candidate to have experience in website backups and restoration as I have a backup of the website that needs to be restored.