Many people got certificates because it is very hard, difficult and annoying for them to show their abilities or repeat a moderate-difficult task. Active devel

Many people got certificates because it is very hard, difficult and annoying for them to show their abilities or repeat a moderate-difficult task. Active developer with daily practice does not required any certifying papers. Good developer even didn't hide his code. Piles of high quality code. Look at the people who bring us linux, freebsd, openbsd and thousand other projects.