Dr.-Ing. Mario Heiderich is a Founder at Cure53. He possess expertise in penetration testing, computer security, web application security, javascript, information security and 22 more skills. Colleagues describe him as "When Mario Heiderich started a company offering security testing services, I simply knew Cure53 would soon gather attention and will be known as one of the most qualified teams on the market. I was not wrong, and I have the privilege to having worked with Cure53. Throughout the years we have analyzed, broken, fuzzed and reverse engineered everything there is. Be it software libraries, embedded systems, web, mobile or native OS applications - we kept on dissecting protocols, exploiting crypto, bypassing filters, injecting all possible payloads and extracting private data. We were really thorough - it was not rare that a browser 0day was discovered along the way, and confirmed critical issues were found even where our competitors did not deliver. What I really liked is the seriousness Mario and the team treated each project. All engagements were not just a report-producing endeavors, but a professional attempt to help with security issues, ensuring our understanding of the application and its threat model matches to that of a client. We strove to keep a close contact with the developers so that reported issues are well understood and fixed in a correct way. Obviously, my opinion is biased, but I can recommend Mario Heiderich and Cure53 when you're looking for a top-notch quality vulnerability assessment and penetration testing. If you're still not confident - go look up our past reports, contrary to many we love open-source and (if customer agrees) reports are public. Be prepared though: don't love your software too much - because it just might get severely broken." and "Mario is certainly one of the top-class security researchers out there. His astounding work regarding HTML5 security, Cross Site Scripting vectors and ECMAsript 5 continues to impress me. But he doesn't stop at detecting possible bypasses for certain new technologies, he also develops working solutions preventing them. I especially admire his ECMAScript 5 DOM sandboxing attempt. I would surely recommend Mario Heiderich for any kind of web security project."