Invest in Security,
Invest in Your Future
Leaders in offensive cybersecurity, AI security, and the assessment of critical environments. We protect your digital assets through advanced technology, deep technical expertise, and expert-led analysis.
$20B+
Protected Assets
500+
Audited Projects
+10 Years
Impeccable Track Record
What We Do
Specialized Services
Comprehensive security solutions for complex digital environments, business-critical applications, and rapidly evolving technology ecosystems.
Web & Infrastructure Pentesting
Exhaustive evaluation of servers, corporate networks, and cloud architectures to shield against persistent threats.
Hacking as a Service (HaaS)
Continuous simulation of real-world attacks (Red Teaming) to proactively identify and mitigate critical vulnerabilities.
AI Security & LLM Auditing
Securing Large Language Models and AI integrations against prompt injection, data leakage, and adversarial attacks.
Mobile Auditing
Rigorous pentesting for native and hybrid applications in iOS and Android environments.
Code Auditing
Comprehensive manual and automated source code reviews to identify vulnerabilities and ensure secure software development.
Blockchain & Smart Contract Auditing
Advanced protection for smart contracts, DeFi protocols, and decentralized ledger architectures.
Who We Are
Elite Offensive Security Experts
Red4Sec is made up of world-class security researchers and ethical hackers focused on securing critical digital environments and complex applications.
With more than 10 years of experience, we have become a trusted partner for organizations that require advanced security capabilities and a technical approach grounded in real-world risk.
- check_circle International expertise in offensive cybersecurity.
- check_circle Specialized in critical infrastructure, AI security, and Web3.
- check_circle Active contributors to security best practices and industry standards.
Companies That Trust Us
"I've seen Red4sec evolve from a group of White-Hat hackers to Blockchain security experts and also prominent NEO opensource code contributor at protocol levels. I highly appreciate the full security audit Red4sec did for NEO last year."
Da Hongfei
Neo Smart Economy Co-Founder
"nOs was able to deploy its Token Sale platform with ease and confidence thanks to the expertise and afficiency of Red4Sec. Great people and equally great hackers."
Dean van Dugteren
nOS Founder & CEO
"When we began the challenge of finding a firm qualified to conduct a security audit, we were immediately impressed with the knowledge of cryptography and distributed systems possessed by the Red4Sec team. Our team is confident that we’ve landed on the best choice to aggressively test the Nano consensus protocol."
Colin LeMahieu
Nano Founder
"It is very rare in the world to find organisations that don't only do what they say they will, but to find ones that go above and beyond. Red4sec is one of those hard to find organisations. They brought extensive knowledge of cryptography, hacking and exploits to bear and found issues where others had failed to even look."
Andrew Huntley
DAPS Coin CTO
"We used Red4Sec to audit our NEP-5 token ICO smart contract as well as our web infrastructure. They truly are a partner of Narrative, and we look forward to working with them again on future projects. I couldn't have been more impressed with their communication and the quality of work they delivered."
Brian Lenz
Narrative.network Co-Founder & CTO
Contact
Ready to Secure Your Project?
Our team is ready to carry out a thorough assessment of your infrastructure, applications, or code, identifying vulnerabilities and areas for improvement before they turn into real-world risk.
We take a rigorous and tailored approach to every environment, from penetration testing, and mobile application security audits to specialized assessments for AI systems, critical infrastructure, and Web3.
Red4Sec CyberSecurity
B88046479
Madrid, Spain
Calle Princesa 31, 2da Planta, 2da Puerta, 28008, Madrid
