Runtime Verification Inc. is a startup company aimed at using runtime verification-based techniques to improve the safety, reliability, and correctness of software systems. The Haskell team is working on an open source Haskell K backend.
Global Access Internet Services GmbH uses Haskell to do analytics of their data center usage primarily for billing, but also other purposes. Haskell powers the backend of the application and is also used for automated deployment and monitoring thereof.
Full-stack Haskell apps using the Reflex FRP library which was originally written by its founders. Also uses PostgreSQL, Nix and NixOS.