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They should be comfortable hacking into and defending systems running Windows, Linux, iOS, Android, etc. Familiarity with programming languages like Python, Java, C++, and SQL is also important. What methodologies and tools do you commonly use? They should be well-versed in established penetration testing methodologies like the Open Web Application Security Project (OWASP) and able to use popular hacking tools such as Kali Linux, Nmap, Wireshark, Metasploit, and John the Ripper.