Architecture starts with product boundaries
Folders should reflect the product more clearly than the framework. If the application contains a utility directory, player profiles, match data, saved items, and account settings, those are useful feature boundaries. A single global components folder containing every button, modal, card, table, filter, and page-specific widget hides that structure.
A practical starting shape looks like this:
The exact names are less important than the rule: code that changes for the same product reason should live close together.
Separate domain data from presentation
A component should not need to understand raw API inconsistencies, URL parsing, date normalization, access rules, and visual layout at the same time. Translate external data into a stable domain shape near the service boundary, then let interface components consume predictable values.
This makes static data and remote data easier to interchange. Daily CS Nades uses a static, fast-loading Next.js frontend to expose thousands of utility events. The radar, filters, result cards, and video deep links can work from a consistent event model without each component reinterpreting the source data. Read the Daily CS Nades case study.
Keep state as local as the behavior allows
Global state is useful when multiple distant parts of the application must coordinate. It is expensive when used by default. Local component state, URL state, server or loader data, and shared client state solve different problems.
- URL state is appropriate for filters, search, pagination, and views users may share or revisit.
- Local state fits disclosure, temporary input, hover, selection, and isolated interaction.
- Server data should retain its loading, error, caching, and freshness semantics.
- Shared client state belongs to cross-route or cross-feature behavior that cannot be derived cheaply.
If every value moves into one store, dependencies become invisible. If every component fetches and transforms its own data, behavior becomes inconsistent. The goal is explicit ownership.
Build primitives around constraints, not screenshots
A reusable button is not reusable because it accepts thirty props. It is reusable because it encodes stable rules: focus visibility, disabled behavior, hit area, loading treatment, icon spacing, contrast, and a small set of intentional variants.
The same applies to fields, dialogs, cards, tables, navigation, and page shells. Visual tokens define color, type, spacing, radius, elevation, and motion. Components apply those tokens through documented variants. Product features compose the components without bypassing their accessibility or responsive rules.
Design loading, empty, error, and permission states early
Many component systems look coherent in a polished route and fragment under real data. A list must know what to show before data arrives, when no records match, when the request fails, when only part of the response is available, and when the user lacks permission.
Document the data requirements and supported states beside the visual variants. A consumer should not have to invent error placement or loading geometry each time the component is used.
Use route boundaries to control bundle and failure scope
Route-level loading, code splitting, error boundaries, and data access keep failures contained and reduce the amount of JavaScript required for the first view. Heavy editors, charts, maps, or authenticated tools should not automatically become part of a public landing-page bundle.
Static export is valuable when the product permits it because the result is simple to host and fast to deliver. It is not a universal answer: authenticated, highly dynamic, or frequently changing data may need server rendering, incremental generation, APIs, or client fetching. Architecture follows the product's freshness, security, and interaction needs.
Accessibility belongs below the feature layer
Features should not recreate keyboard patterns, dialog focus management, field labels, error association, or reduced-motion handling. Put those rules into the shared primitives and verify them there. Feature tests can then focus on the product journey while still checking that composed behavior remains accessible.
This is one reason a design system is operational infrastructure, not a visual library. It reduces the number of places where critical interaction rules can diverge.
Test contracts at the right level
- Unit tests protect transformations, calculations, and small behavioral contracts.
- Component tests verify rendering, interaction, accessibility names, and state changes from the user's perspective.
- Integration tests cover features across data, routing, and composed components.
- End-to-end checks protect the few journeys whose failure would harm the business.
- Production build and visual QA catch bundling, hydration, asset, responsive, and hosting behavior that isolated tests cannot prove.
Tests are most useful when they protect decisions. Snapshotting every DOM detail makes legitimate design changes expensive without necessarily catching broken behavior.
A maintainability review checklist
- Can a developer identify which feature owns a behavior?
- Are external data shapes normalized before presentation?
- Can filters and important view state be shared through the URL?
- Do shared primitives own accessibility and interaction rules?
- Are loading, empty, error, and permission states intentional?
- Do route boundaries control bundle size and failure scope?
- Are tests concentrated around valuable contracts and journeys?
- Does the production build receive desktop, mobile, and real-host verification?
Scale clarity before abstraction
The best architecture is not the one with the most layers. It is the one that makes product decisions easy to locate, change, test, and ship. Start with clear feature ownership, stable data boundaries, and a restrained component system. Add abstraction only after repetition reveals a real shared rule.
See our QuizRaiders product work, explore Tampa web application development, or bring us a React codebase that has become difficult to change safely.
Neil Gerbe
Founder of ProWebDevSolutions and a Web Development Specialist serving Clearwater, Tampa, and the wider Tampa Bay region. Neil designs and ships conversion-focused websites, Shopify storefronts, WordPress platforms, and custom web applications.
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