Freelancer profile translated to English.
Back to original languageAbout César
I am a Junior Pentester and DevSecOps Specialist, with experience in full stack development and eJPT certification, and working on OSCP+.
I help companies and developers detect vulnerabilities and strengthen the security of their web applications, infrastructures, and CI/CD pipelines.
🔍 Main Services:
Web security audits (OWASP Top 10)
Server and network hardening (Linux, Fortinet/Palo Alto firewalls)
Pentesting in development and pre-production environments
Integration of security controls in the SDLC
Automation of security tasks with Python and Bash
🧠 My approach combines a developer's vision and an offensive mindset, allowing me to detect and explain vulnerabilities from code to infrastructure.
I work with passion, detail, and constant communication. You can see examples of my reports on my GitHub:
👉
📍 Languages: Spanish and English (C1), French (A1)*learning*
💻 Modality: Remote / Hybrid
🚀 Objective: to help companies improve their security posture and grow with them.
Spanish
Native or bilingual
English
Fluent
French
Basic
Can work on-site
Madrid (up to 50km)
Experience
- Grupo BackupDevSecOps Engineer / Full Stack DeveloperOctober 2024 - Today (1 year and 8 months)• Conduct web security audits (WordPress, internal applications) identifying OWASP Top 10 vulnerabilities (SQLi, XSS).• Automation of hardening and monitoring of Linux servers with Python and Bash, reducing minor security incidents by 25% in the first quarter after implementation.• Integration of security controls in the SDLC and CI/CD deployments.• Collection and application of IOCs (Indicators of Compromise) to improve rules and signatures in monitoring systems.
- Luanju ClimatizacionesSoftware Developer & Security SpecialistJuly 2023 - October 2024 (1 year and 3 months)• Management of security and hardening of WordPress environments: updates, security plugins, and reduction of attack surface.• Collaboration in configuring Fortinet firewall policies to restrict unnecessary access to internal services.• Development in C# with a focus on security from design.
- Fontventa S.L.Software Development InternshipMarch 2023 - June 2023 (3 months)Participation in .NET projects using Visual Basic, applying secure development practices under Agile.
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Education
- Certified Junior Penetration Tester (eJPT)eLearnSecurity (INE)2025Certified Junior Penetration Tester (eJPT)
- OSCP (Offensive Security Certified Professional)2025OSCP (Offensive Security Certified Professional)
Certifications
- Certified Junior Penetration Tester (eJPT)INE2025