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Junior Frontend Developer Interview Questions

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8,133 junior frontend developer interview questions shared by candidates

React.js, TypeScript, JavaScript, GraphQL - What is pureComponent ? - lifecycle methods - hooks - diff between useEffect & useLayoutEffect - portals - how do you make API calls - refs in React, when are they used ? - error handling - what is prop drilling ? - difference b/w createElement() & cloneElement - React Router Authentication & Authorization - how do you handle browser incompatibilities GraphQL: - what are benefits of using GraphQL - GraphQL queries & mutation - multiple queries in one request - REST API request methods GET, POST, PUT, PATCH, DELETE - error handling TypeScript - getter & setters - generics in TS - declare in TS, namespace - classes in TS - assert in TS
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Senior Frontend Developer-React JS

Interviewed at Firstsource Solutions

4.1★
Jul 25, 2023

React.js, TypeScript, JavaScript, GraphQL - What is pureComponent ? - lifecycle methods - hooks - diff between useEffect & useLayoutEffect - portals - how do you make API calls - refs in React, when are they used ? - error handling - what is prop drilling ? - difference b/w createElement() & cloneElement - React Router Authentication & Authorization - how do you handle browser incompatibilities GraphQL: - what are benefits of using GraphQL - GraphQL queries & mutation - multiple queries in one request - REST API request methods GET, POST, PUT, PATCH, DELETE - error handling TypeScript - getter & setters - generics in TS - declare in TS, namespace - classes in TS - assert in TS

reverse a string i.e "INdia is my country" to "Yrtnuoc My Si Aidni" Input output based questiosn on this key, promises, shallow copy, deep copy shallow copy vs deep copy Promise all, any, allsettled, race async vs defer prefetch pre load, preconnect How do you reduce the bunlde size lazy loading techniques difference b/w use state and use reducer what is useSelector in redux redux architecture what are some react design patterns that you follow in react Context api React fiber Virtualization what is jsx reconciliation process Explain about your project and your roles and responsibilities what is the most challenging task that you have taken
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Frontend Engineer

Interviewed at UST

3.8★
Dec 26, 2025

reverse a string i.e "INdia is my country" to "Yrtnuoc My Si Aidni" Input output based questiosn on this key, promises, shallow copy, deep copy shallow copy vs deep copy Promise all, any, allsettled, race async vs defer prefetch pre load, preconnect How do you reduce the bunlde size lazy loading techniques difference b/w use state and use reducer what is useSelector in redux redux architecture what are some react design patterns that you follow in react Context api React fiber Virtualization what is jsx reconciliation process Explain about your project and your roles and responsibilities what is the most challenging task that you have taken

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