Dawid Czagan is listed among the Top 10 Hackers by HackerOne. He has found security vulnerabilities in Google, Yahoo, Mozilla, Microsoft, Twitter, and other companies. Due to the severity of these bugs, he has received numerous awards for his findings. He has delivered security training courses at key industry conferences, such as Hack In The Box, CanSecWest, 44CON, Hack In Paris, DeepSec, BruCON, and for many corporate clients. His students include security specialists from Oracle, Adobe, Red Hat, Trend Micro, Philips, ESET, ING, and the government sector. Dawid Czagan is founder and CEO at Silesia Security Lab, which delivers specialized security auditing and training services.