I’m aware of 3-5 large companies (the number depending on what you define as “large”) that are using Haskell for big, serious projects, but all but one of them

I’m aware of 3-5 large companies (the number depending on what you define as “large”) that are using Haskell for big, serious projects, but all but one of them is in the defense or banking industries. Companies in these industries are usually not interested in sharing their experiences or engineering techniques, so it feels very quiet compared to when some hip startup starts (loudly) marketing some technology they’re using.