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30+ Grammarly questions

Grammarly interview questions and how to prepare

The questions candidates report from Grammarly interviews, sorted by how often they come up, with difficulty and topics, plus original practice written in Grammarly's interview style.

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ZorixOS tracks 30 community-reported Grammarly interview questions, drawn from an open-source dataset of real interview reports and sorted by how frequently each one comes up. Every question links to its source. Alongside them are 78 original ZorixOS practice questions written in Grammarly's known interview style (not claimed as asked at Grammarly), so you can rehearse the real format. Practice any of them out loud in a free AI mock interview tuned to Grammarly.

Updated July 2026

Grammarly interview questions candidates report

Community-reported from real Grammarly interviews (open-source dataset), most-asked first. Showing 30. Each links to its source.

  1. Merge Intervals
    ArraySorting
    Medium100% asked
  2. Minimum Substring Partition of Equal Character Frequency
    Hash TableStringDynamic ProgrammingCounting
    Medium100% asked
  3. Non-overlapping Intervals
    ArrayDynamic ProgrammingGreedySorting
    Medium100% asked
  4. Search Insert Position
    ArrayBinary Search
    Easy100% asked
  5. Two Best Non-Overlapping Events
    ArrayBinary SearchDynamic ProgrammingSorting
    Medium100% asked
  6. Remove All Adjacent Duplicates In String
    StringStack
    Easy91% asked
  7. Search in Rotated Sorted Array
    ArrayBinary Search
    Medium90% asked
  8. Recover a Tree From Preorder Traversal
    StringTreeDepth-First SearchBinary Tree
    Hard90% asked
  9. Insert Delete GetRandom O(1)
    ArrayHash TableMathDesign
    Medium89% asked
  10. Vowel Spellchecker
    ArrayHash TableString
    Medium89% asked
  11. Remove All Adjacent Duplicates in String II
    StringStack
    Medium87% asked
  12. Climbing Stairs
    MathDynamic ProgrammingMemoization
    Easy84% asked
  13. Repeated DNA Sequences
    Hash TableStringBit ManipulationSliding Window
    Medium80% asked
  14. Sqrt(x)
    MathBinary Search
    Easy78% asked
  15. Generate Parentheses
    StringDynamic ProgrammingBacktracking
    Medium75% asked
  16. Logger Rate Limiter
    Hash TableDesignData Stream
    Easy73% asked
  17. Perfect Number
    Math
    Easy73% asked
  18. Sum of Left Leaves
    TreeDepth-First SearchBreadth-First SearchBinary Tree
    Easy73% asked
  19. Evaluate Reverse Polish Notation
    ArrayMathStack
    Medium62% asked
  20. Check If a String Contains All Binary Codes of Size K
    Hash TableStringBit ManipulationRolling Hash
    Medium56% asked
  21. Implement Trie (Prefix Tree)
    Hash TableStringDesignTrie
    Medium56% asked
  22. Word Search
    ArrayStringBacktrackingDepth-First Search
    Medium56% asked
  23. Word Break II
    ArrayHash TableStringDynamic Programming
    Hard55% asked
  24. Decode the Slanted Ciphertext
    StringSimulation
    Medium48% asked
  25. Maximum Palindromes After Operations
    ArrayHash TableStringGreedy
    Medium48% asked
  26. Number of Islands
    ArrayDepth-First SearchBreadth-First SearchUnion-Find
    Medium48% asked
  27. Special Binary String
    StringDivide and ConquerSorting
    Hard48% asked
  28. Trapping Rain Water
    ArrayTwo PointersDynamic ProgrammingStack
    Hard48% asked
  29. Unique Paths
    MathDynamic ProgrammingCombinatorics
    Medium48% asked
  30. Word Break
    ArrayHash TableStringDynamic Programming
    Medium46% asked

Practice questions in Grammarly's style

Original ZorixOS questions written the way Grammarly interviews, so you rehearse the real format. Not claimed as asked at Grammarly.

  1. Imagine Grammarly's core text-rewriting engine is experiencing a sudden surge in latency for real-time suggestions. Describe how you would approach debugging this issue, considering our user base and the critical nature of instant feedback. What metrics would you prioritize monitoring?

    Software EngineerDebugging and PerformanceTests: Evaluates debugging methodology, understanding of distributed systems under load, and metric identification for real-time services.

  2. We are considering expanding Grammarly's capabilities to include real-time translation suggestions alongside grammar and style. Outline a high-level system design for this feature, considering potential challenges like maintaining accuracy across languages, handling concurrent requests, and integrating with our existing infrastructure.

    Software EngineerSystem DesignTests: Assesses system design skills, ability to handle complex integrations, and consideration of scalability and performance.

  3. A customer reports that Grammarly Premium is incorrectly flagging a common idiom as a grammatical error. How would you investigate this bug? What kind of data would you look for, and what steps would you take to reproduce and fix it?

    Software EngineerDebugging and Code ReasoningTests: Tests debugging skills, analytical thinking, and understanding of how to diagnose issues within a complex language model.

  4. Grammarly's user base spans individuals, students, and enterprises. Design a system that can efficiently store and retrieve user-specific writing feedback history across millions of users, ensuring privacy and fast access for features like 'My Grammarly'.

    Software EngineerSystem Design and Data StorageTests: Evaluates database design, scalability considerations, and data management strategies for a large user base.

  5. How would you optimize the performance of Grammarly's suggestion generation for users with very large documents (e.g., entire books)? Consider trade-offs between accuracy, latency, and resource consumption.

    Software EngineerPerformance OptimizationTests: Assesses understanding of algorithmic efficiency, resource management, and trade-off analysis in performance-critical systems.

  6. Describe a scenario where a poorly written piece of text could cause unexpected behavior or incorrect suggestions in Grammarly. How would you design system checks or tests to prevent such edge cases from impacting user experience?

    Software EngineerReasoning and TestingTests: Tests logical reasoning, understanding of potential failure modes, and ability to design preventative testing strategies.

72+ more Grammarly-style questions are in the free library, each practiceable live with adaptive follow-ups and an honest scorecard. Start free.

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Grammarly Interview Questions (2026) | ZorixOS