Top 23
Prep plan
Updated weekly · Last refresh Oct 17

One Drop Software Engineer Interview Questions

The questions to prepare for a One Drop Software Engineer interview. Questions from real interview reports rank first. Updated daily.

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~4htotal time
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1
CodingStart here. 7 questions · ~77 min
Two Sum with TargetEasy
Practice

Use a hash map to find two array elements that sum to a target in O(n) time.

Hash TablesArraysStringsOne Drop
Palindrome Function ImplementationEasy
Practice

Determine whether a string reads the same forward and backward using a two-pointer scan.

RecursionStringsTwo PointersOne Drop
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2
Execution4 questions · ~44 min
Choose Monolith or MicroservicesMedium

Evaluate the execution trade-offs between monoliths and microservices and explain how you would choose the right approach.

Trade-offsRisk AssessmentScope ManagementOne Drop
Design a Scalable ApplicationEasy

Explain how you would design a scalable application, including trade-offs, risks, stakeholder needs, and how you define success.

Trade-offsRisk AssessmentScope ManagementOne Drop
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3
Behavioral & Leadership7 questions · ~77 min
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4
More topics5 questions · ~55 min
Design a URL Shortening ServiceHard

Design a URL shortening service that routes, ranks, and monitors links at scale.

Feature StoreModel ServingOne Drop
Real-Time Health Data ArchitectureHard

Tests your ability to design reliable, low-latency pipelines for streaming diabetes data at scale.

InfrastructureStream ProcessingOrchestrationOne Drop
React Lifecycle ExperienceMedium

Tests your frontend engineering knowledge and how you manage component behavior over time.

CommunicationOwnershipOne Drop
Optimize a Slow SQL QueryHard
Practice

Rewrite a slow PostgreSQL loan payment query to reduce scanned rows while preserving the required aggregated results.

database optimizationJoinsData WranglingOne Drop
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Hands-on SQL practiceWrite and run real queries in the editor. 2 drills · ~20 min
The finish line: interview-readyComplete all 23 questions plus 2 hands-on drills to finish this plan.