Quantumsec

QuantumSec is a Spanish cybersecurity company that does one thing: offensive security. We don't sell generic IT services, managed infrastructure or generalist consulting. Our entire practice is built around finding what an attacker would find — before they do — and proving the real business impact of it.

Based in Valencia (Spain) and operating across Spain and Europe, remotely and on-site, our team brings 10+ years of experience, 200+ offensive security projects, 3,274+ critical vulnerabilities identified and 20,000+ hours of hands-on pentesting. Our clients include IBEX 35 companies, public-sector bodies, critical infrastructure operators and international organisations. What we do Penetration testing — web and APIs (REST/GraphQL), mobile (iOS/Android, OWASP MASVS/MASTG), internal and perimeter infrastructure, Active Directory, cloud (AWS, Azure, GCP), SaaS, IoT/OT and AI/LLM systems.

Red Team & TLPT — adversary simulation aligned with MITRE ATT&CK and TIBER-EU, including Threat-Led Penetration Testing under DORA articles 26–27 for financial entities. We measure MTTD/MTTR, not just findings. Security audits — source code review (SAST + manual), Microsoft 365, Google Workspace, SAP, corporate Wi-Fi, GDPR. Regulatory compliance — NIS2, DORA, ENS, ISO 27001, Cyber Resilience Act, AI Act and EN 18031.

Gap analysis, action plan and support through external certification. Social engineering, bug bounty & VDP management, and security training for boards, technical teams and staff. How we work. Manual exploitation and impact validation, never just an automated scan. Methodologies: OWASP, OSSTMM, PTES, MITRE ATT&CK, NIST and ISO 27001.

Every engagement includes an executive report, a technical report, a closing session and a retest of the fixes applied. Credentials. OSCP, CRTO and Burp Suite Certified Practitioner certified team. Accelerated by INCIBE Ventures, certified Innovative Startup by ENISA, selected for NVIDIA Inception, winner of Valencia's Best Cybersecurit