there is no public list as far as I know.It is hard to measure a web developers skills. Some are self taught and have to formal training but yet are awesome while I know "web developers" with a degree that can't program crap.The most common way to measure that I have seen is to ask for certifications as a side note and mainly focus on experience in each area (time frame, 1 or 2 years, etc) as well as ask for examples of work. Ultimately there finished product is the most important way to measure their skill.