It depends in the country you are.

If you want to show of your skills, why not write an article about it. This way you don’t publish company property (maybe only snippets of code) and the viewer can read your reasons on why you made certain decisions.

But do not do this without consent of the company. If the company likes it, you could even start your article something along the lines of “here at %company% we like to write good code…”. Than it is a win-win. I see this a lot on sites like medium.com

I wonder if it has something to do with the framework you pick. There are probably frameworks that aim to be as stable as possible but lack the cutting edge.

Also all the tracking and analysis tools that are integrated in most ecommerce are huge. We made a website for a company that was really fast and snappy. Then they added all their tools and it turned into a slug.