It is better to have someone hired reading the entire code and make sure that there is no malicious code inside it, if you have a security person for your website, it is much better. Typically security always costs a lot, it depends how much coding and whether it is encrypted or open source, and moreover you should remember, security is very important for website.
Even if you do not have hot wallet on the site, the chances are someone can add backdoors and address may generate from different bitcoin servers.
P.S : I am a website developer and marketer, i know how security is very important to an website.
Thanks for the info.
Its going to be a faucet site with a simple multiplier on it. It will be a short 3-4 page site. How much do you think security would be for a site like that?