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Senior Frontend Engineer Interview Questions

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1,542 senior frontend engineer interview questions shared by candidates

2. FRONTEND SYSTEM DESIGN (1 hour, Zoom and Excalidraw). The task was to architect a solution for a frontend app (no need to discuss typical system design topics like load balancers, etc). The idea is to determine a basic design and user flow / UX for the application described. The major considerations were application performance, user interactions, frontend-backend interactions (what endpoints and what kind of data and why), data structures/state, and any libraries or techniques you would use. It was important to identify performance bottlenecks and their solutions (dom rendering, lazy loading, caching, etc.).
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Senior Software Engineer - Frontend

Interviewed at Datadog

4★
Aug 4, 2023

2. FRONTEND SYSTEM DESIGN (1 hour, Zoom and Excalidraw). The task was to architect a solution for a frontend app (no need to discuss typical system design topics like load balancers, etc). The idea is to determine a basic design and user flow / UX for the application described. The major considerations were application performance, user interactions, frontend-backend interactions (what endpoints and what kind of data and why), data structures/state, and any libraries or techniques you would use. It was important to identify performance bottlenecks and their solutions (dom rendering, lazy loading, caching, etc.).

- General web technology questions (what happens when you enter a URL into a browser) - Basic React (state management, effects, React children behavior when parent state changes) - Intermediate - advanced React concepts (useCallback, refs) - Redux as it's used a lot at Docusign
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Senior Frontend Engineer

Interviewed at Docusign

3.6★
Oct 24, 2023

- General web technology questions (what happens when you enter a URL into a browser) - Basic React (state management, effects, React children behavior when parent state changes) - Intermediate - advanced React concepts (useCallback, refs) - Redux as it's used a lot at Docusign

2. Promises and Chaining Example: console.log("Start"); const x = new Promise((resolve) => { setTimeout(() => resolve(1), 100); }); x.then((d) => { console.log(d); return d * 2; }) .then((d) => { console.log(d); return d * 3; }); x.then((d) => { console.log(d); return d * 5; }) .then((d) => { console.log(d); return d * 7; }); console.log("Reached");
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Senior Software engineer - 2 (frontend)

Interviewed at CoinDCX

4.1★
Mar 5, 2025

2. Promises and Chaining Example: console.log("Start"); const x = new Promise((resolve) => { setTimeout(() => resolve(1), 100); }); x.then((d) => { console.log(d); return d * 2; }) .then((d) => { console.log(d); return d * 3; }); x.then((d) => { console.log(d); return d * 5; }) .then((d) => { console.log(d); return d * 7; }); console.log("Reached");

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