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It would appear that they pay their employees fairly well, as seen in this old job posting [1] (not all levels will make this much of course but it gives you a general idea, almost 300k a year is a lot even for a staff engineer).

$275,000 is almost $23,000 a month. Take that times N amount of employees, and other business overhead, and suddenly $80k a month is literally peanuts.

[1] https://tailwindcss.com/blog/hiring-a-design-engineer-and-st...