Building Scalable Web Applications with Haskell

on YouTube ↗52m

" summary

A production Haskell web app of 100,000+ LOC uses Yesod, Template Haskell and Persistent to enforce rich domain types, type-safe routing to prevent broken links, and per-request caching so multiple widgets don’t trigger duplicate DB reads; integrated Hspec tests run against Postgres and slow the suite so SQLite in-memory is recommended for speed, Hedgehog property tests verify round‑trip serialization, subsites replace microservices, and centralized isAuthorized logic controls access.

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" chapters (11)

1. 0:00Introduction and team overview
2. 8:22Debunking Haskell myths
3. 19:31Type safety and parametricity
4. 24:46Type-safe routing in Yesod
5. 33:39Testing strategies in Haskell
6. 40:23Widgets and frontend architecture
7. 44:35Database interaction with Persistent
8. 47:05Authorization and access control
9. 48:08Form handling in Yesod
10. 50:16Scaling with subsites instead of microservices
11. 51:20Q&A and closing remarks

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