Grammarly Frontend Engineer Interview Questions

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

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CodingStart here. 18 questions · ~184 min

Process asynchronous Grammarly Editor request events using a map and min-heap to classify completions, timeouts, and pending requests.

Number of Islands LeetCodeMedium

Practice

Count connected islands in a binary grid using depth-first search with four-directional adjacency.

leetcodedfsbfs

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Perfect Number LeetCodeMedium

Practice

Determine whether an integer is perfect by summing its proper divisors in O(sqrt(n)) time.

coding challengeleetcodeAlgorithms

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System Design9 questions · ~92 min

Evaluates your ability to design a complex, user-facing messaging UI with scalable frontend architecture.

Architecture for Real-Time CollaborationHard

Evaluates system design for real-time UX, consistency, and maintainable frontend architecture.

design

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SSR vs CSR for High TrafficMedium

Assesses tradeoffs between rendering strategies for performance and scalability.

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More topics2 questions · ~20 min

Immutability in JavaScript StateMedium

Assesses understanding of immutability benefits and how they affect frontend state updates.

javascriptperformancestate management

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React Interview Resume WalkthroughMedium

Assesses your ability to connect your background to React-focused frontend work.

experiencereact

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The finish line: interview-readyComplete all 29 questions to finish this plan.