Does the census actually track that? I just did the questionnaire last night online and it didn't ask me anything about my occupation.

Or did you mean something other than the US Census (e.g. GitHub or Stack Overflow or LinkedIn profiles)?

The long form asks about your line of work. Most people get the short form.

No, I meant the US census (or whatever national census), I didn’t actually check if they asked that since it seemed like such a basic thing :/ sorry.

Not as easy as you might think, since “developers” isn't particular to software and software developers have lots of other near-equivalent terms, the set of which in use changes over time, and many of them aren't unique to software, either.

OTOH, historical BLS data is easy to look up.