10 Shapes of Dev
blog.workshape.io
blog.workshape.io
And perhaps it's just a limitation of the data that are being presented here, but the top skill of a CTO should never be JavaScript unless it's a tech team consisting only of the CTO (and yes, that is sometimes the situation in a fledgling startup, but really it's little more than self-aggrandisement to use that title in that case).
As for the sample size. 1373 profiles supplied job titles that fell into these buckets out of approximately 3500 at the time we generated the infographic.
Its seems contradictory that the roles requiring years of experience (or they ought to) have JavaScript as the top skill. I would have expected an older less trendy language (like Java or C, or SQL) to be top in those positions.
They're state awarded titles, so it may be different in the private sector.
Second guess: JS is the only ecosystem front-end devs generally know.
Third guess: back-end engineers avoid JS like plague - hence the separation into front- and back-end devs.
This gives me hope that I'm more in line with the development community rather than a curmudgeon :)