Haskell, a language older than Java and Python, has only recently seen an uptick in commercial use. Why did it take so long? In this talk, we’ll see how design decisions made almost thirty years ago are paying off, as well as tooling improvements that have made Haskell more suitable for commercial use. Seen through the lens of using Haskell at Helium, we’ll also explore production software concerns like builds, deploys, monitoring, logging, and testing.