Gabriel Castello
Self Employed
Madrid, Community of Madrid, Spain
Summary
👤
Senior🎓
Top SchoolGabriel Castello is a Pentester Manager based in Madrid with 12 years of hands-on experience bridging software development and offensive security. He progressed from .NET developer roles into dedicated web and mobile pentesting, later leading pentest teams at CyberProof while continuing freelance bug hunting on HackerOne and Bugcrowd. His background in full-stack development and legacy enterprise .NET systems gives him a pragmatic edge in assessing real-world attack surfaces and crafting reproducible remediation. Trained in professional ethical hacking courses and with practical developer certifications, he pairs exploit discovery with secure coding insights. Gabriel’s career shows a steady evolution from building business applications to breaking and hardening them, and he still actively hunts bugs outside the corporate scope. This blend of developer intuition and attacker mindset helps him translate findings into actionable security improvements for engineering teams.
12 years of coding experience
2 years of employment as a software developer
Full Stack Web Development Computer Software Engineering, Full Stack Web Development Computer Software Engineering at Free Code CampFP Administracion de sistemas informaticos, FP Administracion de sistemas informaticos at Sa ColominaCurso Oficial de Desarrollo Web con Microsoft Visual C# .NET 2010 (120h) especialidad, Curso Oficial de Desarrollo Web con Microsoft Visual C# .NET 2010 (120h) especialidad at CICECertificado profesional de hacking etico (CPHE) 180 horas Hacking etico, Certificado profesional de hacking etico (CPHE) 180 horas Hacking etico at The Sentinel Securitydiplomado Turismo, diplomado Turismo at Universidad SEK SegoviaEntrenamiento practico de hacking etico (20H), Entrenamiento practico de hacking etico (20H) at Securizame
English, Catalan
Github Skills (105)
certification10
javascript10
android-security10
mobile-application10
android-application10
hidden10
apk10
nodejs10
css10
codebase10
extraction10
math10
web-security10
react10
ios-security9
Programming languages (8)
Github contributions (5)
dokkillo/h1rd
May 2017 - Oct 2022
Contributions:154 commits, 156 pushes, 1 branch in 5 years 5 months
dokkillo/dokkillo.github.io
Aug 2015 - Feb 2019
Contributions:6 PRs, 23 pushes, 4 branches in 3 years 6 months
Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.