Software developer with 10 years of experience as professional developer and about 15 years of experience as hobbyist.
During my career I have learned how to:
Make business software
Make system software
(On a side note I also work on games as hobby and android apps, nothing published yet).
You can see detailed information about my skills in my skills overview.
I guarantee that I am adept with those skills.
I can not show you business software I did for my employers but I can show you...