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Updated weekly · Last refresh Aug 30

Grammarly Software Engineer Interview Questions

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

50questions
~9htotal time
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1
CodingStart here. 13 questions · ~142 min
Rate Limiter ClassMedium
Practice

Use a deque-based sliding window to decide which Grammarly requests stay within a per-second limit.

rate limitingGrammarly
Count Substrings With CharacterEasy
Practice

Count contiguous substrings containing a target character using a last-seen index in O(n) time.

Grammarly
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2
SQL & Data Manipulation3 questions + 1 drill · ~43 min
Table A Not in Table BEasy
Practice

Use PostgreSQL EXCEPT to find complete suggestion rows in snapshot A that are absent from snapshot B.

sqlGrammarly
Users With No OrdersEasy
Practice

Find Grammarly users with no orders using a LEFT JOIN and NULL filtering.

JoinssqlGrammarly
Top Earners via Table JoinMedium
Practice
Practice drill

Rank Motorola Solutions employees by total earnings using a LEFT JOIN, aggregation, COALESCE, and ROW_NUMBER.

JoinssqlMotorola SolutionsMotorola
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3
Execution12 questions · ~131 min
SQL vs NoSQL Trade-offsMedium

Tests your ability to choose the right data store based on requirements.

Trade-offsRisk AssessmentScope ManagementGrammarly
Optimize Web App PerformanceMedium

Tests your practical performance tuning skills across frontend and backend.

Trade-offsRisk AssessmentScope ManagementGrammarly
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4
System Design12 questions · ~131 min
Collaborative Counter Web AppHard

Assesses your system design skills for real-time collaboration, consistency, and scalability.

Grammarly
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5
Security & Infrastructure7 questions · ~76 min
Experience With Okta Corporate IdentityMedium

Assesses your familiarity with identity and access management integrations and related security practices.

Grammarly
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6
Behavioral & Leadership3 questions · ~33 min
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The finish line: interview-readyComplete all 50 questions plus 1 hands-on drill to finish this plan.