senior15 min

Senior Frontend Engineer

Frontend Engineer

A rigorous technical interview for senior frontend roles. Expect deep questions on React internals, performance optimization, accessibility, and CSS architecture. Surface-level answers will be challenged.

Practice this interview

Free. No card. Ten runs a month.

Focus areas

React
TypeScript
Performance Optimization
Accessibility
CSS Architecture

Difficulty

This is a senior-level interview. Expect deep knowledge of React internals, performance optimization, and architecture decisions. Surface-level answers should be challenged with follow-ups like 'Can you explain the mechanism behind that?' or 'What trade-offs did you consider?' Do not accept buzzword answers — probe for concrete examples and implementation details. When a candidate mentions a pattern, ask them to describe a time it failed or they chose differently.

Topics it will probe

React rendering lifecycle and reconciliation
State management patterns and trade-offs
Bundle optimization and code splitting
WCAG compliance and screen reader support
CSS-in-JS vs utility-first vs BEM
Testing strategies for UI components

What to expect

Fifteen minutes, and four things you keep

Format: A voice conversation with an AI interviewer — spoken, not typed.
Feedback: An assessment as soon as you finish, with the specific thing that would have made a thin answer stronger.
Transcript: Every word of it, yours to read back — including the parts you would rather forget.
Skill proofs: Created when an answer actually demonstrates something, and attached to your profile as evidence.

The questions are pitched at the senior level, and the interviewer follows up on what you say rather than reading down a list.

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Senior Frontend Engineer

Focus areas

Difficulty

Topics it will probe

Fifteen minutes, and four things you keep

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