Hi, I'm Sling / Mathijs and active in the Dutch hacker scene since ~2006. Frequent visitor of hacker events such as CCC, OHM/SHA/?, EMF, was involved with HAR2009 orga, member of Toool and active in the 2600NL community. Planned events: EMF2016 / Haxogreen / 33c3 / SHA2017, let's meet up there!
Dayjob is pentesting, and outside office hours you can still find me doing security challenges, wargames and training for CTF's. If you want to know anything about these subjects, feel free to poke me on IRC (Sling on Freenode, OFTC, Smurfnet, and some others).