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Phase 23 · Interview Preparation

Technical

Performance optimization

Part of the Frontend Developer Roadmap.

Summary

Being able to talk through how you'd diagnose and fix a slow page — the classic 'this page is slow, what would you do?' interview question.

How to Learn This

  • 1Prepare a structured answer: measure first with Lighthouse/DevTools, then optimize based on data.
  • 2Have 2-3 real examples ready from your own projects where you improved performance.
  • 3Practice explaining the difference between perceived and actual performance.

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Browser internals

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Security (XSS, CSRF)

More technical in Interview Preparation

HTML, CSS, JavaScript, React, TypeScriptBrowser internalsSecurity (XSS, CSRF)AccessibilityREST APIsHTTP methods and status codesSystem design (frontend)
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