Hackers on Your Side
Professional ethical hacking services for your business - From penetration testing and red teaming to AI and LLM security.
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Trusted by
Trusted cybersecurity for the AI era
3,000+ projects
We've assessed the security of more than 3,000 projects.
14 years
14 years of ethical hacking expertise.
47 experts
A team of 47 certified cybersecurity professionals.
20+ CVEs
Our team has discovered more than 20 officially assigned CVEs.
3,293 vulnerabilities
3,293 security vulnerabilities identified in 2025.
01
Simulated Attacks
Want to know how to prevent a hacker attack on your company? Use the skills and expertise of our certified ethical hackers. We stay ahead of emerging threats and use artificial intelligence in our simulated attacks, just like real-world adversaries do today.
Penetration Testing
Penetration testing reveals vulnerabilities in your systems, infrastructures, and processes, and helps to ensure compliance with standards like PCI – DSS, DORA, NIS2, ISO 27000, GDPR, and others.
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Red Teaming
Are you confident in your overall level of security and want to experience what it's like to be as close to a real hacking attack as possible? Red Teaming is what you're looking for. Try a Threat-Led Penetration Test as well.
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Social Engineering
Simulated attacks through social engineering help you test the extent of your organization's vulnerabilities due to human error. By combining phishing and vishing campaigns, we achieve a success rate of up to 40%.
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Human expertise. AI acceleration. Proven security.
Artificial intelligence is transforming the way organizations operate and redefining the rules of cybersecurity. At Citadelo, we're at the forefront of this shift, combining 14 years of ethical hacking expertise with the power of AI. We help you innovate without compromising security.
Discover how AI-assisted penetration testing works
The future of penetration testing isn't humans or AI, it's humans, AI, and automation working together. That's the approach we already use at Citadelo.
We leverage advanced AI tools to make penetration testing faster, broader, and more effective. AI helps our ethical hackers analyze complex environments, identify potential attack paths, and process findings more efficiently. Every finding, however, is always validated by an experienced security expert.
At Citadelo, AI doesn't replace people, it amplifies their expertise.
AI in our penetration testing
We integrate AI directly into our penetration testing process. It accelerates reconnaissance, expands test coverage, and helps uncover more vulnerabilities in less time. Final risk assessment and validation always remain in the hands of an experienced ethical hacker.
Securing your AI and LLM applications
Are you deploying large language models (LLMs), AI agents, or generative AI? We assess them for prompt injection, model data leakage, jailbreak techniques, and adversarial attacks and help you prepare for compliance with the EU AI Act.
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Every organization has different security challenges. We'd love to learn more about yours during a 15-minute consultation with one of our cybersecurity experts.
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02
Tested Technologies
Hacking is our passion, which we have been deepening daily for over 14 years. Thanks to this expertise, we are able to test most technologies with the highest quality. We continuously evolve our methodologies and leverage AI throughout the testing process to increase coverage and identify more vulnerabilities in less time. The final verdict, however, always comes from a skilled ethical hacker.
03
Tested segments
For more than 14 years, we have been conducting ethical hacking for companies of all sizes and backgrounds. Therefore, no specifics of your business will surprise us today.
Healthcare Security Testing (MedTech)
We test vulnerabilities that could compromise the integrity and availability of medical technologies or the confidentiality of the most sensitive medical data. We also prepare you for compliance with GDPR, ISO 27001, HIPAA or IEC 62304 standards.
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Industrial Security Testing
Automation and AI have brought a new perspective on security. We assist with security audits of industrial control systems (OT/SCADA) and verify the security compliance of your systems with NIS2, IEC 62443, ZKB and other standards. This protects your know-how and prevents costly production process outages.
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Financial Industry Testing
Partial penetration tests as well as the comprehensive Threat-Led Penetration Test provide you with the information needed to ensure a safer IT environment, systems, infrastructure, and applications and to comply with standards like DORA, PCI-DSS, PSD2, and others.
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04
Secure AI and LLM Systems
Artificial intelligence is transforming the way organizations operate, but it's also creating entirely new attack vectors. Large language models (LLMs), AI agents, and integrations with internal systems introduce security risks that traditional penetration tests weren't designed to uncover, including prompt injection, model and context data leakage, jailbreak attacks, and adversarial manipulation. At Citadelo, we assess your AI systems with the same rigor as your web applications and infrastructure. We identify weaknesses before attackers do and help you demonstrate compliance with regulatory frameworks such as the EU AI Act, NIS2, and DORA.
AI expands the scope
AI-powered reconnaissance and analysis help map your attack surface faster and in greater depth.
Human expertise drives the attack
Where judgment, creativity, and experience matter most, our ethical hackers take over.
You get more value
Broader test coverage, more genuine vulnerabilities uncovered, and clear, actionable recommendations, not pages of false positives.
Learn more about AI & LLM security testing
Identify weaknesses before attackers do.
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A single source of trust for cybersecurity validation
Modern security testing is no longer the work of a single team, it’s the combined effort of human experts, automated scanners, and AI systems. That's why every Citadelo engagement is powered by Protrion, our AI-Native Security Validation Network. Protrion takes findings from any source and turns them into trusted, regulator-grade evidence your organization can act on with confidence. We don't just hand you a list of vulnerabilities. We give you a verifiable security validation history you control. Protrion is how we make trust, not just testing, the deliverable.
Validation Layer
Turns findings from humans, scanners and AI systems into trusted, standardized evidence.
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Trust Layer
Signs and preserves integrity - cryptographic signatures, timestamps and evidence chains.
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Coordination Layer
Lets providers, AI agents and remediation workflows operate together within one trust model.
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05
Other Services
Do you have additional needs in cybersecurity and want to minimize risks and their impacts? We can help you with a wide range of your needs.
Cyber Defense
With SOC as a Service, you gain a continuous overview of your network.
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Audit & Consulting
We prepare you for external or internal audits and compliance with standards.
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Training
Regular training of your employees reduces the risk of human error, the most common attack vector on your business.
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Book a free consultation now
We would like to learn more about the individual needs of your company. Therefore, we offer a 15-minute consultation call.
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Why Test With Us?
Ethics
Our ethical principles are based on voluntary and mutually confidential relationships. We handle very sensitive information daily, for which we take responsibility and ensure its discreet and ethical processing.
High Quality
We approach every project professionally, responsibly, and with full commitment. We regularly educate ourselves, share our technological know-how, and apply it in practice - including the integration of AI into our security testing methodologies.
Transparency
We communicate clearly and understandably. If the real possibilities differ from your expectations, we will tell you. If an unexpected problem arises, we will let you know immediately.
Quick Response
We rely on lean and functional processes, within which we work to deliver the outputs of our work as quickly as possible, so that you can manage your time efficiently. We accelerate penetration testing by using AI to automate repetitive parts of the assessment. That allows our security experts to focus on what machines still can't do: thinking like an attacker and uncovering complex vulnerabilities.
Care
Our work does not end with the delivery of the final report. As part of a broader cooperation, we can help you address follow-up needs, for example, in the area of defensive security.
Innovation
We're among the pioneers in applying artificial intelligence to offensive security. We continuously evaluate and integrate the most effective AI tools to accelerate reconnaissance and analysis. This enables us to cover a broader attack surface and uncover more vulnerabilities than a purely manual approach. Advanced AI gives our experts more time to focus on complex attack scenarios, business logic flaws, and high-impact security risks. Our ethical hackers stay in control. AI simply extends their capabilities.
Career
Didn’t find a position that suits you? No worries, we are always on the lookout for super talented geeks with hacker DNA and an ethical heart for various positions. So don’t hesitate—let us know about you!
SENIOR ETHICAL HACKER 🥷🏻 | REMOTE 🌍
We're looking for you. Another geeky brain with hacker DNA and an ethical heartbeat.
Contract:
Full time
Region:
Remote
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