Wordpress security

HI guys,

I am interested in having someone to take a look at my Wordpress core and theme files to check for possible data base injections, CSS and js injections, back doors malware and remove them in case they are found. The reason is because I haven't seen changes in rankings but my traffic is getting down after the last spam update. I would like to ask you any advice regarding, and if you offer this type of service or know someone who does, because I have tried a couple of services and it was not good. Many thanks!