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Level timebar taggable with notes on using Stack/Ex
Although this is rather project specific and would not perhaps convey general skill level. It might be and idea to see how a developer is doing on StackExchange helping others and getting help. The combination of Codeivate and S/E could be gold mine of useful information. I think the tags could be inserted either automatically when my SE question is added or inserted by hand to explain what I am doing. They could look a bit similar to soundcloud tags.
Сервис поддержки клиентов работает на платформе UserEcho