Question 1

React vs Vue vs Angular — when should I choose React?

Accepted Answer

Choose React when: you need the largest ecosystem and talent pool, your team has JavaScript/TypeScript experience, you want flexibility in architecture choices (React is a library, not a framework), and you need strong community support. Vue is better for: teams that prefer convention-over-configuration and gentler learning curve. Angular is better for: large enterprise teams that want a complete framework with built-in routing, forms, HTTP, and dependency injection. React powers over 40% of web applications globally — it's the default choice for most product teams.

Question 2

How do your React developers handle complex state management?

Accepted Answer

We categorize state by type: server state (TanStack Query/React Query for caching, syncing, and optimistic updates), client global state (Zustand for simple stores, Jotai for atomic state, Redux Toolkit for complex domains), local component state (useState/useReducer), and URL state (Nuqs or search params). The key insight: most "state management" problems are actually server-state caching problems — TanStack Query solves 80% of what people used Redux for.

Question 3

What is React Server Components and do I need them?

Accepted Answer

React Server Components (RSC) let you render components on the server with zero JavaScript sent to the client. Benefits: smaller bundle sizes (server-only dependencies don't bloat the client), direct database/API access from components, and automatic code splitting. RSC are most valuable in Next.js 14+ App Router applications. For SPAs without SSR, RSC don't apply. We use RSC for data-heavy pages (dashboards, content pages) and Client Components for interactive features (forms, animations, real-time updates).

Question 4

How do you test React applications?

Accepted Answer

Testing pyramid for React: unit tests with Vitest/Jest for utility functions and custom hooks, component tests with React Testing Library for component behavior (testing what users see, not implementation details), integration tests for multi-component flows, and E2E tests with Playwright for critical user journeys. We avoid testing implementation details (state, instance methods) and focus on user-visible behavior. Snapshot tests are used sparingly — only for stable UI components that rarely change.

Question 5

Can you migrate a class-based React codebase to hooks and modern patterns?

Accepted Answer

Yes — incremental migration is our standard approach. We start by adding hooks to new components and tests, then convert existing class components to function components with hooks in priority order: most-changed files first (they benefit most from simpler code), then critical path components, then the rest. We use codemods for mechanical transformations and manual refactoring for complex lifecycle logic. Throughout the migration, the app remains fully functional — we never do a big-bang rewrite.

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