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Practical patterns for structuring React and Next.js projects so teams can move fast without losing maintainability. A deep dive into folder structure, co-location, and boundary thinking.
Frontend architecture is one of those topics that every team debates and few agree on. After working on enterprise-scale React applications for over 8 years, I've developed a set of principles that consistently produce codebases teams can actually navigate.
Start with feature co-location
The most impactful structural decision you can make is to co-locate everything a feature needs. Components, hooks, types, styles, and tests all live together under a feature directory. This is how Linear, Vercel, and most modern product teams structure their frontend code.
src/
features/
auth/
components/
hooks/
types.ts
index.ts
dashboard/
...Establish clear module boundaries
Each feature should have a single index.ts that controls what it exports. Nothing outside the feature should import from internal files directly. This single rule eliminates 80% of spaghetti dependency problems.
Treat shared code as a library
Anything used by more than one feature lives in src/shared/ or src/common/. Components here must be generic, well-tested, and stable. Promote code only when there's genuine reuse, not speculative reuse.
The three-layer rule
Most feature code can be organized into three layers: UI (components, styles), Logic (hooks, state, business rules), and Data (API calls, cache, transformations). Keeping these layers distinct makes testing and refactoring dramatically easier.
When you follow this pattern consistently, new engineers can navigate your codebase in their first week, and you spend less time debating structure and more time shipping features.
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