I'm a designer and I'm preparing my own portfolio website. Right on the bottom, I would like to mention that it is I (or me, just don't bite my head off :p ) who coded the website to highlight the fact that I also write code in addition to design. Most people say "made by me" which doesn't sound great to me. So, what's a better way of saying that without sounding too sophisticated and "grammarly inclined"?
Try a more formal announcement such as...
This site and all of the sites linked to from the "Gallery" page were hand-crafted by Ayadi Ghait. They are under copyright and unauthorized duplication of the underlying source code for reuse is prohibited by the author.
...Throwing in the copyright and usage information dilutes the boastfulness of the first statement, giving the entire paragraph a purpose, while still getting your primary point (that you personally created this site) across.
I'd use the name you are promoting. If the website is your business name, I'd sign with that down the bottom. If it is your first name I would use that. I wouldn't use your first name if you have a business name as that's not promoting yourself.
Definitely don't use 'handcrafted by me' though.
If you want to point out that you did both, why not just say "Designed and Coded by me"? (Although I also would use your official business name instead of "me".)