I wrote my first real-time kernel 1975 for Honeywell H316 processor. Experience: several assembly languages, Fortran, Algol 60, Delphi, JavaScript, Prolog, Lisp, C++, Java and many languages between those; application areas: measurement and control, communication protocols, simulators, debuggers, compilers, UI and software design tools and generators, wrist-watch UI (Suunto Spyder dive computer), mobile phones. I have written hardware drivers, designed system architectures, analyzed systems, requirements and needs, and developed design methodologies. Nowadays I do full-stack development for web based systems in Linux environment. I try to make systems, their development and maintenance as simple as possible.