TkDodo Dominik Dorfmeister • 4/13/2026

The Vertical Codebase

This article discusses the pitfalls of horizontal codebase structures (e.g., components/hooks/utils folders) that group files by type rather than domain. The author argues this approach becomes unmanageable as projects scale, citing examples like Sentry's 200+ component files. The post also addresses the relevance of good code structure in the age of AI coding agents, suggesting that agents benefit from the same boundaries and constraints humans need. It promotes vertical, domain-based organization for maintainability and scalability.

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#Frontend Architecture #Vertical Slices #Codebase Architecture