Five foundations for building complex Rails apps: DDD, Mutation Testing, Event Sourcing, CQRS, and AI.

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An overview of five architectural foundations for scaling complex Rails applications beyond typical complexity thresholds (~100-150k lines of code). The foundations are: Domain-Driven Design (prioritizing business understanding over code), Mutation Testing (verifying test quality using tools like Mutant), Event Sourcing (storing state transitions rather than just current state, using Rails Event Store), CQRS (separating read and write models for complex data presentation needs), and AI (which benefits from the explicit boundaries and named operations the other patterns provide). Each pattern is presented as incremental and composable rather than all-or-nothing.