Grammarly Mobile Engineer Interview Questions

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

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CodingStart here. 22 questions · ~199 min

Reverse a singly linked list in-place using iterative pointer manipulation.

Array Pivot and Rotated IndexEasy

Practice

Compute a target's index after virtual right rotations of a sorted array in O(log n) time and O(1) space.

binary searchArray Manipulation

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Math HackerRank CodingMedium

Tests your problem-solving skills and ability to implement correct algorithms under interview constraints.

MathArraysSearching

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Swift and iOS FundamentalsMedium

Tests your core iOS and Swift fundamentals relevant to building Grammarly mobile experiences.

Hash TablesArraysStrings

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ViewModel Testing StrategyMedium

Tests your approach to unit testing, dependency isolation, and maintainable test design for mobile architecture.

Hash TablesStackQueue

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Optimizing Mobile App PerformanceMedium

Tests your ability to identify bottlenecks and apply performance improvements in mobile apps.

Hash TablesSearchingGreedy

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Behavioral & Leadership12 questions · ~108 min

Prioritizing Across Competing Client ProjectsEasy

Tests prioritization under pressure across multiple projects, including trade-off judgment, stakeholder communication, and ownership of outcomes.

OwnershipPrioritization

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