Osman Melih ZEYTUN is a seasoned cybersecurity professional currently serving as a Senior Penetration Tester at QNB Finansbank since July 2019 and holds multiple positions including Penetration Tester at HackerOne, Cobalt Core Pentester at Cobalt, and SRT Member at Synack Red Team, all of which commenced in 2021-2024. Previously, Osman was a Pentest Team Leader and Application Security Specialist at BGA Bilgi Güvenligi A.Ş. from January 2016 to July 2019 and has experience as a Software Developer at Heart Factory and an ASP.NET Developer at Lingtech A/S. Osman holds a Master's degree in Adli Bilişim from Gazi University and a Bachelor's degree in Computer Engineering from Sakarya University.