Summary
Matthew Telfer is a cybersecurity founder and CEO with nine years of professional experience and roughly 18 years as a hobbyist and freelancer, specializing in web application, network, API, cloud, and IoT security. A former greyhat turned ethical researcher, he runs Bug0xF4 and performs freelance penetration tests, 0day exploit development, and security awareness training while actively participating in bug bounty programs and responsible disclosure. He has led and founded multiple security initiatives, sold vulnerabilities via ZDI, and retains hands-on skills in source code auditing and exploit development. Based in Newcastle upon Tyne, he combines entrepreneurial experience running his own firms with deep practical expertise across offensive and defensive security.
10 years of coding experience