Interview Questions for React js: A Recruiter's Guide

This comprehensive guide compiles insights from professional recruiters, hiring managers, and industry experts on interviewing React js candidates. We've analyzed hundreds of real interviews and consulted with HR professionals to bring you the most effective questions and evaluation criteria.

A React.js developer is responsible for designing and implementing user interface components using React.js concepts and workflows. They work closely with development teams to enhance user experience and ensure the visual elements of applications are seamless and functional. This role involves collaboration with back-end developers, UX/UI designers, and product management teams to satisfy project requirements. Based on current job market analysis and industry standards, successful React jss typically demonstrate:

• Proficient in JavaScript, HTML, and CSS, Experience with React.js and its core principles, Knowledge of state management libraries (Redux, MobX), Familiarity with APIs (REST, GraphQL), Understanding of responsive web design, Version control systems (Git), Testing frameworks (Jest, Enzyme), Build tools (Webpack, Babel)
• 2-5 years of experience in front-end development with a strong focus on React.js.
• Strong problem-solving skills, Effective communication and teamwork, Attention to detail, Ability to work in a fast-paced environment, Adaptability and willingness to learn

According to recent market data, the typical salary range for this position is $80,000 - $120,000, with High demand in the market.

Industry-standard screening questions used by hiring teams:

• What attracted you to the React js role?
• Walk me through your relevant experience in Technology and Software Development.
• What's your current notice period?
• What are your salary expectations?
• Are you actively interviewing elsewhere?

These questions are compiled from technical interviews and hiring manager feedback:

• Explain the virtual DOM and how it works in React.
• What are props and state in React? How do they differ?
• How do you manage side effects in React?
• What is JSX? Why is it used?
• Explain the component lifecycle in React.

• Understanding of React concepts and principles
• Ability to write clean and maintainable code
• Proficiency in debugging and troubleshooting
• Experience with relevant tools and libraries
• Demonstrated ability to implement user interfaces effectively

• Focusing too much on minor details rather than overall architecture
• Not being familiar with recent updates or best practices in React
• Neglecting performance optimization techniques
• Failing to demonstrate problem-solving abilities during coding exercises
• Inability to explain thought processes clearly

Based on research and expert interviews, these behavioral questions are most effective:

• Can you describe a time when you had to collaborate with a team on a project?
• How do you handle tight deadlines and pressure?
• Tell us about a significant challenge you faced and how you overcame it.
• What motivates you to stay updated on industry trends and technologies?
• Describe an instance when you received feedback about your work. How did you respond?

This comprehensive guide to React js interview questions reflects current industry standards and hiring practices. While every organization has its unique hiring process, these questions and evaluation criteria serve as a robust framework for both hiring teams and candidates.