I'm Sergio Mahía, a Software Engineer specializing in cybersecurity, with a clear mindset: to truly protect systems, you first have to think like someone trying to break them.

My career began by founding my own web development and security startup, where I went from zero to building a portfolio of over 20 clients in less than a year. In that process, I not only developed solutions but also focused on something I consider critical: protecting users from real-world threats. I worked with advanced techniques such as Web Application Firewalls (WAFs) and continuous auditing, identifying and exploiting vulnerabilities like XSS and SQL Injection to understand and mitigate them at their root.

Currently, I work at KPMG as a Software Engineer and Ethical Hacker, where I tackle complex security challenges in real-world environments. I've designed and developed ambitious projects, from automated vulnerability analyzers to educational platforms for CTF training, always with a practical and results-oriented approach.

I consider myself an ambitious, resourceful person with a great capacity for learning. I enjoy tackling difficult problems, learning from my mistakes, and transforming those errors into robust solutions. I'm also an active communicator on social media and blogs, where I translate complex cybersecurity concepts into accessible ideas, aiming to raise awareness among both businesses and users.

I firmly believe that the best defense against an attacker is to anticipate them. That's why I don't just build secure systems; I constantly test them, pushing their boundaries before others do.