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Xebia Frontend Engineer Interview Questions

The questions to prepare for a Xebia Frontend Engineer interview. Questions from real interview reports rank first. Updated weekly.

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let, const, and var DifferencesEasy

Tests knowledge of JavaScript scoping, hoisting, and immutability semantics.

javascriptabstractionbasics
Xebia
Closures and Real-World Use
Medium

Assesses JavaScript fundamentals and ability to apply closures to practical problems.

javascript
Xebia
Virtual DOM and Performance
Medium

Tests understanding of rendering mechanics and performance implications in React.

reactperformance
Xebia
var vs let vs const
Easy

Tests JavaScript variable declaration semantics and their impact on runtime behavior.

javascript
Xebia
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Reusable Component Library DesignHard

Assesses ability to design scalable UI systems with strong APIs and maintainability.

Xebia
Core Web Vitals Optimization Process
Hard

Tests performance engineering approach using measurable web performance metrics.

performanceweb optimization
Xebia
Client-Side Auth Flows
Medium

Evaluates security-aware design for auth and authorization in frontend apps.

client-sideauthenticationauthorization
Xebia
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Cross-Browser Compatibility Handling
Medium

Assesses practical strategies for ensuring consistent UX across browsers.

Frameworks
Xebia
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