The following shows what top percentile of tag contributors a user is considered to be in, based on the old logic used for Careers CVs, the current logic used in the Developer Story, and the suggested new logic for the Developer Story.
For this test page, only the user's top 100 tags are considered, and only the top 1000 most popular tags on Stack Overflow, therefore it's possible that some tags are missing that are displayed in the CV or Developer Story.
There may also be some rounding artifacts, so slight deviations are possible. The point of this page is only to judge whether the logic generally seems fair, not to show 100% precise data.
Note that the old CV logic only considers 10%, 20%, and 30% buckets, not 1% and 5%.