Felipe Melchior (hdrnn)

Brazil

Security engineer focused on offensive security, AppSec, and real-world attack paths.

What I work with

Experience

Senior Software Engineer – Security Automation / Application Security

2024 - Present

USA (Remote)

Driving application and cloud security initiatives through security automation, secure CI/CD design, and scalable AppSec practices across a global platform.

Senior Cyber Security Engineer – Offensive Security / Penetration Tester

2025 - Present

Brazil

Leading offensive security engagements focused on APIs and web applications, identifying real-world attack paths and supporting secure design decisions.

Senior Cyber Security Engineer – Offensive Security / Application Security

2022 - 2024

Brazil

Executing offensive security assessments, Red Team exercises, and AppSec initiatives to strengthen security posture across applications, CI/CD, and mobile platforms.

Cyber Security Analyst / Backend Developer

2020 - 2022

Brazil

Combined role covering Red Team operations and backend development: conducting red team operations and penetration testing; supporting incident response and vulnerability disclosure programs; building and maintaining backend microservices for real-time financial systems with a focus on scalability, performance, and secure coding practices.

Blogs

2026-01-30

Latinoware 2021 - analyze (web challenge)

A walkthrough of a web challenge focused on code review, type coercion, and subtle logic flaws in Node.js.