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Senior Frontend Engineer Interview Questions

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2,897 senior frontend engineer interview questions shared by candidates

-Coding: Find some information in a tree (DFS); pattern matching (without regex) -Assignment: built a small app that displays a time series chart data, with alerting -Design: design a UI component that visualizes arbitrary log data or arbitrary size. Talk the tradeoffs of how to do it in performant way etc. -Hiring Manager: Why do I want to join the company; Talk about past projects and what I did in them (the more technical details the better). Talk about the most interesting/difficult project which took long to execute etc.
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Senior Frontend Engineer

Interviewed at Datadog

4★
May 15, 2021

-Coding: Find some information in a tree (DFS); pattern matching (without regex) -Assignment: built a small app that displays a time series chart data, with alerting -Design: design a UI component that visualizes arbitrary log data or arbitrary size. Talk the tradeoffs of how to do it in performant way etc. -Hiring Manager: Why do I want to join the company; Talk about past projects and what I did in them (the more technical details the better). Talk about the most interesting/difficult project which took long to execute etc.

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

1. LIVECODING TECHNICAL SCREENING (1 hour, Zoom and Coderpad). 2 relatively easy (leetcode easy/medium) questions to be solved with js or ts. One was a typical string manipulation question which required no particular algorithmic knowledge, and the other one was a problem where knowing graphs was particularly helpful. I was allowed to do mdn searches or ask for help where necessary.
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Senior Software Engineer - Frontend

Interviewed at Datadog

4★
Aug 4, 2023

1. LIVECODING TECHNICAL SCREENING (1 hour, Zoom and Coderpad). 2 relatively easy (leetcode easy/medium) questions to be solved with js or ts. One was a typical string manipulation question which required no particular algorithmic knowledge, and the other one was a problem where knowing graphs was particularly helpful. I was allowed to do mdn searches or ask for help where necessary.

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