In total, around 50 full-time employees currently work on Signal
[...]
When benefits, HR services, taxes, recruiting, and salaries are included, this translates to around $19 million dollars per year.
That's 380k/employee on average. Even if half of that went to taxes and other expenses, on average they're paying their employees around 190k/year.
Bro, as a European dev, that's triple my salary! They could possibly double or triple their workforce if they hired from outside of the US.