Would be hilarious if he walked into a job interview and got grilled about it. "yeah, so it says here you worked on the web? do you have a portfolio? what frameworks did you use?"
Well, "Web Developer" is effectively a compound (like in German, we do the same thing but often just keep the spaces between the words).
With a compound, the connection between the words sometimes has to be inferred, usually by inserting an appropriate preposition.
Usually, something like "Developer on the Web" would probably be what we understand.
In TBL's case ... it's "Developer OF the Web".
I think it's a little more idiomatic (at least where I'm from in the US) to specify this difference as, "a web developer" vs "the web's developer"
I'm too lazy to find a picture of a spider for this joke - this exercise is left for the reader.
Trivial exercise.
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If you wish to make an apple pie html site from scratch, you must first invent the universe web. - Carl Sagan Tim Berners-Lee