It’s embarrassing. Back when Zillow was trying to be a real estate broker, they had a pipeline for salespeople to track the progress of flipped houses. I was brought in with oh maybe 50 other devs to code the more extensible replacement.

The existing workflow was all down in google sheets, and it scaled to at least 10 states. There were growing pains, sure, but it seems like a monumental waste to spend an hundred years of dev effort replacing an existing working system that cost the price of a Google enterprise installation.