I agree that helping to create web sites is an EC. A job is also an EC. Universities understand that some high school students need to work to earn money. Perhaps just as important, universities understand that working at a job gives students a valuable perspective. For one thing it allows students to have a better understanding of why they want to attend university.
I think that you are fine, at least on this aspect. Of course we do not know your grades and test scores but that is an entirely different issue.