SMRTR ProgrammingJun 24, 2026Hacker News

The Modular Monolith in Rails: Engines, Packwerk and Boundaries

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Struggling with a tangled Rails app? Before jumping to microservices, consider a modular monolith — one deployable app with enforced internal boundaries. This guide covers the three real mechanisms (Rails Engines, Packwerk, and namespaced modules), how Zeitwerk interacts with modular layouts, data ownership rules, and an incremental migration path — plus honest advice on when NOT to modularize.

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