Become a member

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As a relatively new team based in Denmark, we are currently limiting our recruitment focus to experienced players either based in Denmark, or who otherwise have strong ties to Scandinavia, as well as those who are invited by current team members.

If you are interested in playing with Kalmarunionen, simply write us an email with some information about yourself, your experience, and how you found out about us. You can send it to Be patient though, it might take us a little while before responding.

You can also ask an existing member of Kalmarunionen to start the onboarding process, but only if you know them personally beforehand, or they’ve explicitly invited you to reach out to them. Otherwise use the mail address above.

One of our goals is to help the Danish cybersecurity and CTF communities grow, and we are planning some initiatives to help get more beginners get into the field. Watch this space!