
New to Contra
Guilherme is ready for their next project!

Security professional with 5+ years in penetration testing and application security. Specialized in web, mobile (Android/iOS), and API assessments following OWASP methodologies.
I deliver clear, actionable reports with full attack narratives, PoC exploits, and remediation guidance tailored to your stack.
Certifications: eWPT, eMAPT. Active bug bounty hunter. Fluent in English and Portuguese.
$75 - $100/hr
São Paulo, Brazil
(GMT-3) Argentina Time (ART), ±4 hours