I`m a penetration tester, auditing web applications and vulnerability research is thing very familiar to me. I`m administrating over 200 servers, maintaining it`s security and efficiency. I am a good reverse engineer, I`m familiar with malwares, rootkits, exploit packs, etc. I have a nice background in penetration testing and vulnerability research (see my portofolio). I`m present in few big Hall of Fames (Google, Facebook and Microsoft) for vulnerabilities found, and many other big companies. I have done projects here on freelancer same as yours, but I`m a quite new freelancer, it`s my first serious month. You can ask me anything before to prove that I`m perfect for this job.