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You should hope that a software business would scale non-linearly with employees.

SG&A, which includes sales & marketing, grew 3.06x since 2019 -- so linearly with revenue growth, as is typical for enterprise B2B.

And on the engineering front: If they're not investing substantially in R&D, then they're likely going to flame out in the coming decade. R&D expense grew 2.62x in the same timeframe.

(from https://news.ycombinator.com/item?id=34777320 )

Tripling the revenue and headcount would be ok if they could make this line go up (or even stay level)

https://www.wolframalpha.com/input?i=TWLO+profit+divided+by+...

As it is, the number is negative and the slope is negative.

How much of their revenue came in because of acquisitions like Segment? That said, sustainable growth is ok, Twilio's head count growth was "wild" to put it mild.