I used to work at a very small company (3 people, including myself) that brought in about $4 million per year. The entire software and infrastructure, including

I used to work at a very small company (3 people, including myself) that brought in about $4 million per year. The entire software and infrastructure, including a custom web scraping stack and data analysis pipeline, was written and maintained by one developer. The other person was sort of a business development type - no technical input. It probably wasn't quite as advanced as BuiltWith (scale-wise), but it was similarly impressive how much output was crunched by one developer. I learned a lot from him.