[rahoulb]

Depends on your definition of big.

Partly, you need mobile now, so any Rails stuff is likely to be back-end and hidden. Plus big investors like to go for the exciting stuff.

But if you're looking at companies aren't household names (taking smaller amounts of investment), there are lots out there.

Syft (recruitment) were founded in 2016 and have revenues of over $100m per year - although that's partly due to acquisition by a larger competitor, so when I just looked, separating their valuation from the group wasn't immediately obvious.

I've freelanced and contracted across a few niche industries (construction, print, airport signage management!) where I was building something against competitor software that I discovered was at least partially built with Rails. Those big players in each niche would have revenue in the tens of millions and from what I could see, very small technical teams.

But anyone outside those industries would never have heard of these companies.