The Hacker's Cache

Matthew Younker aka Zumi Yumi is a senior penetration tester with a background in vulnerability management, military service, and technical education. Before entering cybersecurity, he served nine years in the Army, including roles in CBRN operations and satellite communications. After transitioning out of the military, Matthew built his skill set through hands-on experience, earning certifications like the OSCP, OSWA, and Security+. He is passionate about offensive security, clear reporting, and helping others break into the field. Matthew also maintains an active presence in cybersecurity communities and is always willing to share what he's learned along the way.