Hi, I’m Juliano Da Costa — a cybersecurity professional by trade and an independent security researcher by passion. Outside of my consulting work, I actively dedicate my time to researching, testing, and uncovering vulnerabilities in real-world applications through bug bounty programs.

My research focuses on identifying security weaknesses across web applications, APIs, and network-exposed services. I take a methodical, adversary-minded approach — combining reconnaissance, manual testing, and automation to uncover issues that automated scanners often miss.

I’m particularly interested in how small misconfigurations or overlooked logic flaws can be chained together into impactful vulnerabilities. Through responsible disclosure, I aim to help organizations strengthen their security posture while continuously sharpening my own offensive skillset.

This work keeps me closely aligned with emerging attack techniques, real-world exploitation methods, and evolving threat landscapes — insight that directly enhances my effectiveness as a security consultant.

Approach

I approach security research with curiosity, persistence, and discipline. Every target is an opportunity to learn something new — whether it’s a novel bypass technique, a deeper understanding of application behavior, or a more efficient way to test at scale.

I don’t rely on automated scanners to do the thinking. My methodology centers on understanding how an application is supposed to work, then systematically probing where that expectation breaks down. Reconnaissance informs hypothesis. Hypothesis informs testing. Testing informs findings.

Responsible Disclosure

All research is conducted exclusively within authorized bug bounty programs. I follow responsible disclosure guidelines without exception: