Fighting spam with Haskell -- https://engineering.fb.com/2015/06/26/security/fighting-spam...
The Joy and Agony of Haskell in Production -- https://www.stephendiehl.com/posts/production.html
Haskell in Production: Riskbook -- https://serokell.io/blog/haskell-in-industry-riskbook
Haskell at Barclays (talk, not an article) -- https://www.infoq.com/presentations/haskell-barclays/