A good analogy would be the difference between being a brief writer for a law firm and being a fiction author - you have "writing" in common (hopefully "good wr

A good analogy would be the difference between being a brief writer for a law firm and being a fiction author - you have "writing" in common (hopefully "good writing" at that) but the intricacies of each domain make it appreciably different. Web application programming relies on a plethora of "soft" technologies (xhtml/html5, css, javascript, sql/nosql, php/python/ruby/perl, frameworks for all of it, a lot of 3rd part libraries outside of the frameworks, etc...) - embedded programming is much more low level in comparison and comes with many different kinds of problems.