Developing applications, mainly for Android using Java, Kotlin.

I have fun to use C++ for some software that's being used on Android, iOS, Mac OS, Linux. Did quite some development using Android's NDK.

Implementing security functions and protocols (I'm not a cryptographer like Bruce Schneier ;-) ) are also part of my portfolio. Also communication protocols like SIP, RTP, SRTP are known to me :-) .