Is there a blog post somewhere about how many developer work different popular products?
For example, how many devs work on:
- Canva
- Gmail
- Trello
etc.
1–5 of 5 posts
etc.
Investors track this sort of thing, your best shot is there.
Go to LinkedIn and see how many employees work for each company. You can often see a breakdown by type of role on the company page as well.