Disregard my 'Freelancer' profile, I've only just created it to explore further opportunities. I'd advise taking a look at my LinkedIn for more information.
I'm a crypto-specialized software engineer that's the Chief Executive Officer of a development studio. In this case, I've worked in not only mitigating current known threats, but stopping them outright. I've worked to implement countermeasures against site-based exploits, TCP SYN (DDOS) attacks, Packet Capture, Port Management, SQL Injection, Sniffing, Phishing, Social Engineering through internal security measures, HEARTBLEED, B.E.A.S.T through HSTS, removing deprecated security protocols and forcing the more up-to-date variants, multi-layer SSL combined with proxy, and other threats including back-end code fortification.
Normally the price can vary based on whether or not the entire system has to be rebuilt to stand-up against a specific tier-level of security-based attacks, but I'll honor the 'Freelancer' model and will conduct what I can for the amount listed. It's important to realize that 'hacking' is a basic term for elevated cyber attacks, which can vary greatly. It's not possible to completely remove the chance that it will happen, ad infinitum. Though, it's very possible to implement strong countermeasures to prevent it (or mitigate it), based on what you're wanting.
Regardless of whether or not you choose me, if you believe you're vulnerable, it should be taken seriously. Any exploit is a total exploit.