We are trusted by Fortune 500 companies worldwide
We are trusted by Fortune 500 companies worldwide
At Citadelo, we are passionate about cybersecurity and take your protection seriously. That is why we are trusted by Fortune 500 companies from various industry verticals, including banking, automotive, media, finance, crypto, consulting, telecommunications, utilities, and more.
What our clients say
"Choosing Citadelo as a security supplier was absolutely the right choice. Thanks to their expertise, high-quality reports, and excellent communication, we have implemented many important security improvements which have allowed us to take the data security of our company several steps further."
Orange Slovensko a.s.
Henrich Snajder | Information Security Manager
"At Lidl, we take IT security seriously. We believe that it is essential to constantly improve it, which is why we chose Citadelo to test our device and application. We have been very impressed with their work, cooperation, and results."
Lidl a.s.
Petra Zorvanová | ISO & Team Coordinator
"We consider Citadelo to be a trustworthy partner in developing both the process and technical aspects of information security. We appreciate their expertise, professional approach, and the results of their work."
TrustPay a.s.
Ivan Poliačik
"We started working with Citadelo in 2015. They opened up broad horizons in the field of cybersecurity for us, and we showed them the hidden corners of industrial automation. Since then, we have successfully collaborated on several joint projects, including auditing our devices, which are mostly based on proprietary solutions. The Citadelo team helped us identify a number of specific measures that, even in the often tight conditions of industrial automation, allowed us to elevate the cybersecurity of our products to a new level. Citadelo also taught us to think in a slightly different way than before."
ComAp a.s.
Jan Tomandl | Chief Product Analyst
"The penetration testing report provided us with an objective view of the security of our applications. We were satisfied with the terms and the execution of the service."
Union zdravotná poisťovňa, a. s.
Martin Spišák | Head of IT
"We appreciate your client-oriented approach, professionalism, excellent communication, and willingness to help."
Realpad, s.r.o.
Matěj Vitásek | Chief Technical Office
"Our collaboration in the field of information security is long-term. During this period, I have repeatedly been convinced of both their professional and personal qualities."
PENTA INVESTMENTS LIMITED o. z.
Michal Prónay | Head of IT
"At Dr.Max pharmacies, we emphasize professional services in all aspects - whether it’s our brick-and-mortar pharmacies or our website. Penetration tests conducted by Citadelo have helped us set the security level of our online store’s environment to a professional standard. Citadelo responded to all situations flexibly, dynamically, and with a high level of expertise."
Dr.Max, a.s., Slovensko
Slavomír Záborský | Head of IT
"Collaboration with the Citadelo team was extremely smooth. The guys knew exactly what to do, true professionals through and through. If you have an application, e-shop, or any online platform dealing with sensitive data, they are the best you can find."
Costlocker a.s.
Tomáš Wojcik | CEO & Co-founder
Case studies
We have so many amazing stories from our missions that we can never share with anyone. Therefore, special thanks to all our customers who have joined us on the journey of educating others by sharing their stories.
6 May 2025
Dr.Max a.s.
Dr.Max, a leading pharmacy chain in Slovakia and central Europe, entrusted us with security testing for its newly-opened online store, both the public-facing side and the administrative back-end.
6 May 2025
SYGIC
Sygic entrusted us with testing the web application of their Sygic FleetWork product, from the viewpoint of a standard end-user.
Us in media
2 June 2024 | Seznam Zprávy | Petr Juna
We Educate | Seznam Zprávy
Vojtěch Sláma discusses what can be discovered about us and how we inadvertently provide hackers with exploitable information, both at home and at work.
13 April 2024 | iDnes.cz | Matěj Nejedlý
We Educate | iDnes.cz
Vojtěch Sláma explains why a helpful colleague can be the biggest risk and how ethical hackers infiltrate companies to test and strengthen their security.
8 April 2024 | Citadelo školí onsite
We Educate | Czech News Agency
Vojtěch Sláma and Tomáš Zaťko trained journalists from the Czech News Agency on how little it takes to lose everything we have.
12 March 2024 | České Noviny | ČTK
We Publish | České Noviny
We have released our regular Ethical Hacking Report 2023. We found 2,795 vulnerabilities in 384 projects.
9 March 2024 | Lidovky.cz | Lukáš Karbulka
We Comment | Lidovky.cz
Vojtěch Sláma comments on why hackers are increasingly targeting government servers with sensitive information about citizens and the types of attacks they use.
23 January 2024 | Forbes | Karel Wolf
We Comment | Forbes
Dita Horáková comments on the current state of the job market for IT candidates interested in ethical hacking.
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