Considering just how many people from outside of the US Google employes it's quite possible that they simply came from a country that historically didn't have a good vaccine coverage for example India.
In 1980 even Germany had 25% vaccination coverage but I'm guessing it could include East Germany too so a developer in their mid 30's simply might not been vaccinated at a young age and if they didn't travel to high risk countries, joined the military or worked with at risk groups it was never caught.
I happen to know with 100% confidence that some Google employees were recently abroad in an area struggling with a measles outbreak. Of course this doesn't mean it came from some place external to the US, but it certainly means it's not impossible.
Starting in 2009, you could’ve been born in Germany in the 80s which had poor coverage at the time immigrated to the US in the late 90’s and you would not be vaccinated.
Sure. But the Bay Area has long had a large population of Indian immigrants without ever having a measles problem. This is almost certainly caused by anti-vax issues rather than immigration from poorly vaccinated countries.
Heck according to this data https://data.worldbank.org/indicator/sh.imm.meas
In 1980 even Germany had 25% vaccination coverage but I'm guessing it could include East Germany too so a developer in their mid 30's simply might not been vaccinated at a young age and if they didn't travel to high risk countries, joined the military or worked with at risk groups it was never caught.