How do you hire a good React developer?
Look for production React experience, strong JavaScript and TypeScript fundamentals, an understanding of rendering and state, testing habits, performance awareness and clear communication. Assess candidates with a small practical task and a pull request review instead of trivia, and check how they reason about trade-offs.
What a good React developer knows
- JavaScript and TypeScript: closures, async code, types and modern language features.
- React fundamentals: components, hooks, rendering, effects and keys.
- State management: local state, context, and tools such as Zustand or Redux Toolkit when needed.
- Data fetching and caching, for example with TanStack Query or framework features.
- Next.js or similar frameworks: routing, server and client rendering, and metadata.
- Testing: component and end-to-end tests with tools such as Vitest and Playwright.
- Performance and accessibility: avoiding needless re-renders, bundle size and semantic HTML.
- Collaboration: Git, code review and clear written communication.
What to expect by seniority
| Level | What they can do | What to probe |
|---|---|---|
| Junior | Build components from clear specs with guidance | Fundamentals, learning speed, code clarity |
| Mid-level | Own features end to end and write tests | State design, debugging, trade-offs |
| Senior | Design architecture, review others and own quality | System design, performance, mentoring, judgment |
How to assess candidates
- Review real work: shipped products, repositories and their role in them.
- Give a short, realistic task of two to three hours, such as building a small feature with state and data fetching.
- Review a real pull request together and see what they notice and how they give feedback.
- Discuss architecture: how they would structure a feature and why.
- Check communication: ask them to explain a decision in plain English.
Interview questions that reveal depth
- How would you find and fix a component that re-renders too often?
- When would you use a Server Component and when a Client Component?
- How do you decide where state should live?
- How do you handle loading and error states for data fetching?
- What would you test in this component, and how?
- How do you keep a large list fast?
- How do you make a custom component accessible?
- Tell me about a bug that took you a long time to find.
Red flags
- Only tutorials and small personal projects, no production experience.
- Cannot explain why they made a technical choice.
- No habit of testing or code review.
- Dismisses accessibility and performance as extras.
- Vague or defensive when discussing past mistakes.
Freelancer, in-house, dedicated team or agency?
| Option | Best for | Watch out for |
|---|---|---|
| Freelancer | Short, well-defined tasks | Availability and continuity |
| In-house hire | Long-term core product ownership | Time and cost to recruit |
| Dedicated engineer through a partner | Fast start, vetted skills, flexible scaling | Choosing a partner with real vetting |
| Agency project | A defined outcome with a fixed scope | Less embedded in your daily workflow |
A first-week onboarding checklist
- Access to repositories, chat, issue tracker and design files.
- A written overview of the architecture and coding conventions.
- A small first ticket that ships within days.
- An introduction to the people they will work with.
- A clear definition of done, including tests and review.
Key takeaway: A small, real first ticket tells you more about a developer in one week than a long interview does.
Frequently asked questions
How much does it cost to hire a React developer?
It varies with seniority, location and engagement model. Compare the full cost, including recruiting time, management and the cost of a wrong hire, not only the hourly or monthly rate.
Should I test with a take-home task or live coding?
A short, realistic task plus a pull request review usually reveals more than trivia or long live coding. Keep it to a few hours and respect the candidate’s time.
Do I need a React specialist or a full-stack developer?
For complex front ends, performance work or design systems, a React specialist is ideal. For small teams that own features end to end, a full-stack developer who is strong in React can be a better fit.
How fast can a dedicated React developer start?
With a vetted partner, matching can take days rather than months. At GloberixAI, engineers are matched within 48 hours and join your tools right away.