About us

About us

Do you know how to think like a hacker? We do. We think like hackers, but we don’t abuse it. On the contrary, our main goal is to reveal vulnerabilities without causing damage. Being a leader is a matter of course for us, an ethical approach an essential requirement, and a safer IT world our mission.

Citadelo, was founded in 2006 by ethical hackers to help Fortune 500 companies identify vulnerabilities through simulated attacks. By engaging in cloud security testing, application testing, and more, the cybersecurity firm helps businesses achieve a higher level of security. Backed by a team of 30 professionals, the company is a market leader in Slovakia and the Czech Republic and has offices in Zug (Switzerland), Prague and Bratislava.

Our team

Tomáš Zaťko
CEO
Member of the Board
I hacked the bank where you keep your money. Don’t panic, though! I had a contract, and aimed to help. I wrote my first program at age eight, and my first hack was unlocking all the levels in the PC game Supaplex. In my last year of high school I met Juraj Bednár at the Miniprog programming competition, and we would later go on to found Citadelo. Today I run the company, and devote a bit of my time to penetration testing. Other than that, I love outer space and Japanese tea.
Martin Hanic
Ethical hacker
Member of the Board
I wrote my first program on a Didaktik M, was late to prom because of a new linux kernel release, and graduated despite the pitfalls of Gentoo and Battle.net. Since breaking is more fun than fixing, after 15 years in the corporate world, I've decided to move to the side of the ethical hackers. Besides numerous banks, I’ve also hacked the military servers of eight states – luckily, only during the Locked Shields competition.
Tomáš Horváth
Sales Director
Member of the Board
I studied business and marketing at the University of Economics in Bratislava, and gained IT knowledge and skills gradually at a number of companies. I spent the most time as a Key Account Manager for Wincor Nixdorf, where I was responsible for several global clients. Besides my enthusiasm for IT and the fintech world, I like spending time on the badminton court.
Jakub Novák
Sales Manager
Since I was a child I’ve loved seeking out new challenges and adventures, and been happy to break all the rules. I like following trends and try to go with the times. As such, I studied applied informatics at the Faculty of Electrical Engineering at Slovak Technical University. Afterwards, I ultimately managed to get into the IT field, where I feel at home. I really like playing sports, love traveling and meeting new people, and even after many years I don’t mind the nightlife.
František Uhrecký
Ethical hacker
I enjoy figuring out how things work, but even better is figuring out how to force them to do what I want. I’m interested in open source technology, Linux, crypto, and mobile application security. And of course absolutely in offensive security.
Lukáš Václavík
Ethical hacker
I have always loved to break things down, solve tricky puzzles, and learn new things. I also enjoy meeting new people, challenging myself, and pushing my limits. So it's no surprise that I grew passionate about cybersecurity and ethical hacking. When I'm not penetrating enterprise infrastructure, I like to play football, go hiking, ski, and travel.
Adam Mariš
Ethical hacker
I fell in love with computers through computer games. I fell in love with hacking when a friend of a friend needed help to beat a game. However, it’s all been ethical hacking ever since. When it comes to IT security, I have researched and explored various ways to breach enterprise infrastructure and always enjoy taking an offensive approach. I’m also a big fan of open-source technologies like Unix and Linux. I like to cook exotic dishes in my free time, watch movies, listen to music, and love to try new things.
Andrej Šebeň
Ethical hacker
As a little boy, my dream was to become a programmer. My dream came true when I started programming and building websites in college. However, pretty soon, I realized that I liked hacking even more than coding. Because I love such challenges, I got into it, and today I work as an ethical hacker. In addition to hacking, I like sports, board games, and nature.
Michal Havrda
Ethical hacker
Even as a kid I loved mathematics. I focused on that in my studies and when I grew up I married it. Literally. I took mathematics as my wife. I started programming in high school and my first four paychecks bought me my first computer. After university I jumped onto a programming team where I spent 10 years on a lot of web projects (including a system for recognizing parrots). Ultimately I got into hacking. I’m particularly fascinated by overcoming impossible challenges.
Michal Slezák
Ethical hacker
I've loved computers since I was a child. I remember spending most of my free time playing computer games. I got into cybersecurity during college, and over time got to a level where I wanted to go on the offensive. When I'm not sitting on my computer chair, my seat of choice is on my bike. I also like to do other sports, and I’m happy to go for a beer with friends.
Denis Ivan
Ethical hacker
I've always been a little too curious, even since childhood. I was interested in different devices, how they work, what they do, but most importantly, how to force them to do what I want. When I got my first computer, instead of playing, I found a hobby in CTF challenges. I am mainly interested in areas such as reverse engineering, web hacking, IoT, and many others. I really like to manufacture and program various Arduino devices whether they’re designed for hacking or for smart household items. On the other hand, I like sports. I love downhill, I like to travel, and I like to go out with friends.
Vojtěch Sláma
Project & Country Manager
While studying political science at Charles University in Prague I got interested in international security. As a kid I discovered the joys of breaking and fixing things, whether software or hardware, which took me from a company supplying automated systems for urban bicycle sharing into the field of information security and my position as Business Consultant for the Czech Citadelo team. I consider myself a mid-level geek and I’m interested in Android, IoT, gadgets, cycling, and motorcycles.
Marek Paták
Project & Country Manager
I’ve been working as a project manager since 2011. For me, this job isn’t just a chance occurrence in life but a clear choice justified by my personality. My strong points, such as organization, systematization, and advance planning contribute substantially to successful project management. Where others stop planning, I begin. In this way I successfully organize the whole team and keep watch over it so that everything runs like clockwork.
Lucia Komiňáková
HR Manager
I like observing things around me and the world as it is. I also enjoy thinking about different things and my biggest inspiration are complex, nonlinear systems – people. I enjoy thinking with a cup of good coffee, a glass of wine or while reading a book. Thinking in a theatre or while sitting on a bench in a city centre is enjoyable as well. I started my career in the IT recruitment and Executive Search sector. After 7 years spent in an agency, I moved to a department of Human Resources in a private company, where I’m doing my best to make people happy and satisfied, because Human Resources are the best resources in the world.
Dita Horáková
HR Manager
I like working with people and with office paper. And that is actually my work at Citadelo. I always emphasize the importance of details, organization and grammar everywhere. My Media Studies made me believe that education can be entertaining and that’s why I will keep studying as long as I can. I’m an adrenalin girl who likes to travel and love dogs, all animals and living things.

Us in media

Article

ComputerWeekly: VMware vulnerability leaves private clouds open to takeover

ComputerWeekly, Tech
Show
Article

TechTarget: VMware vulnerability enables takeover of cloud infrastructure

Techtarget, Tech
Show
Article

ZDNet: VMware Cloud Director vulnerability could lead to hijack of enterprise server infrastructure

ZDNet, Tech
Show

Have a look at one random day in Citadelo.

There is plenty of us and we have a lot of fun. But we still need something… YOU! Our company of developers, admins and penetration testers is looking for new people.

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We look for people, not machines. We want people who are not afraid to use their own ideas. We respect professionals, who can pass knowledge to a next generation. We appreciate people who know what they are doing and can learn from their mistakes. We seek for fine people, who can work with us and be friends with us.

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