Programming languages

Java (since 2000)
C++/C (occasionally since 1996)
JavaScript (occasionally since 2008)
Python (occasionally since 2016)
Assembler (occasionally since 1989)
Pascal/Delphi/FPC (since 1988)
VBA (2003-2005)

OS

Linux (since 2008 (Ubuntu), openSUSE since 2011, (occasionally CentOS, Debian))
Windows (since 1993)
Android (occasionally since 2012)
embedded (occasionally since 1996)

Specialization:

teamlead/archictect/chief programmer/system programmer
software architect & development
frameworks creation
global optimizations/refactoring/cleanup
migrations
multithreading
code review and making guidance
interprocess communications and making/working with dll/so