- * **Operating systems**: Linux (Red Hat, Fedora, Ubuntu, SuSE, Debian, uClinux), Mac OS X, Solaris (versions 6 to 9),
- NetBSD, AmigaOS, Windows.
- * **Frameworks and APIs**: POSIX, Qt, Gtk, STL, Boost, WIN32, MFC.
- * **Programming Techniques**: OOP, generic programming, metaprogramming, real-time, event-driven, multithreading.
- * **Development Tools**: GCC toolchain, GNU make, auto-tools, MSVC, XCode, Codewarrior, IAR, Code Composer Studio, BSO Tasking.
- * **Revision Control**: Git, Subversion, CVS, RCS, Rational Clearcase, Source Safe.
+ * **Operating systems**: Linux (Arch, Red Hat, Fedora, Ubuntu, Debian, uClinux), Android, MacOS, Solaris, NetBSD, AmigaOS, Windows
+ * **Development Tools**: GCC toolchain (contributor), LLVM, MSVC, XCode, Codewarrior, IAR, Code Composer Studio, BSO Tasking
+ * **Frameworks and APIs**: POSIX, Emscripten, Qt, Gtk, OpenGL, STL/Boost, WIN32, MFC, Protobufs, Google APIs
+ * **Programming Techniques**: OOP, template metaprogramming, multithreading, real-time and event-driven systems
+ * **Version Control**: Git, Subversion, Perforce, CVS, Clearcase, Source Safe
+
+ * **Sysadmin**: KVM, XEN, Docker, Puppet, systemd, Nagios, Munin
+ * **Server software**: BIND, Exim, Qmail, Postfix, Apache, MySQL, PostgreSQL, Mediawiki, Asterisk
+ * **Networking**: TCP/IP, HTTPS, IPv6, DNSSEC, BGP