Category Archives: menu


You can contact me by e-mail via sijmen(a), by phone and Signal via +31652627625, or via the contact form below:

Posted in menu | Comments Off on Contact


Almost all my professional work is highly confidential and thus I cannot publicize about it. Sometimes I find time in my busy work schedule to write about some of my research which doesn’t fall under a non disclosure agreement: 2017-01-31 Websites Nederlandse politieke … Continue reading

Posted in menu | Leave a comment

About me

For over more than 19 years I’m an aficionado for anything related to internet security and developing secure software. I’m specialized in hacking, IT security research and performing advanced penetration testing. My specialty is breaking IT security and then explaining … Continue reading

Posted in menu | Comments Off on About me

In the media

Sometimes the media talks or interviews me about my work, and sometimes I get the opportunity to speak at events: Date Website Subject 2017-03-15 SVT ‘Risk för hackning vid val i Nederländerna’ 2017-03-14 Der Spiegel ‘Stimmenzählung in den Niederlanden: Lieber … Continue reading

Posted in menu | Comments Off on In the media


My company: Secundity My resume: LinkedIn My short updates: Twitter My presentations: SlideShare

Posted in menu | Comments Off on Links