Today I saw the following ad while browsing stackoverflow.com:
Make your next move
with a career site
that's by developers
Now, I can think of three ways to read this:
"Make your next move [...] by developers" as in "by the help of developers".
"[...] a career site that's by developers" as in "by developers' side".
"[...] a career site that's by developers" as in "By developers, for developers".
Still, those readings don't really match the given sentence. In the last case I could accept a standalone "By developers" or "By developers, for developers". But I haven't seen "by" used within a sentence in such a way "that's by someone". Shouldn't there be a verb preceding "by developers", e.g. "built by developers"? if not, how is "by" used in this context?