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Top 29
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Updated weekly · Last refresh Sep 24

Esper Software Engineer Interview Questions

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

29questions
~5htotal time
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1
CodingStart here. 9 questions · ~90 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 TablesArraysStringsEsper
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2
Security & Infrastructure4 questions · ~40 min
Secure System Design and Attack MitigationHard

Assesses your secure system design thinking and threat-aware decision making.

system designSecurityEsper
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3
Behavioral & Leadership9 questions · ~90 min
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4
More topics7 questions · ~70 min
Design Real-Time Sensor Event PipelineHard

Design a real-time pipeline for sensor events that transforms data and feeds a UI with low latency.

Stream ProcessingOrchestrationDependenciesEsper
Design for Low Network ConditionsMedium

Evaluates your ability to design resilient client behavior under poor connectivity.

Esper
SQL and Data Engineering FundamentalsMedium

Tests your SQL proficiency and ability to reason about data system architecture.

data engineeringsqlEsper
REST vs GraphQLEasy

Tests API design knowledge and ability to reason about trade-offs for client-server communication.

Stakeholder ManagementCommunicationEsper
Scale to Millions of UsersHard

Tests system design skills for high-scale, reliable services supporting Esper’s device management platform.

Trade-offsRoadmappingRisk AssessmentEsper
Describe Prior System ArchitectureMedium

Tests ability to explain system structure, tradeoffs, and engineering decisions.

CommunicationOwnershipEsper
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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Monthly Sales Trends by CategoryMedium
Practice
Practice drill

Aggregate monthly sales by product category and use LAG to calculate month-over-month changes.

InfrastructureToolsData WranglingTotal Wine & MoreInc.Benjamin Moore
SQL Data Structure ReviewHard
Practice
Practice drill

Audit PostgreSQL metadata for missing or invalid keys and tables with inefficient sequential-scan patterns.

database optimizationindexesData StructuresMercury
Anagram Check With SQLMedium
Practice
Practice drill

Compare normalized character signatures to determine whether each pair of strings is an anagram.

data cleaningJoinsstring manipulationAdobe
The finish line: interview-readyComplete all 29 questions plus 3 hands-on drills to finish this plan.