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Updated weekly · Last refresh Aug 30

Zendesk Software Engineer Interview Questions

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

50questions
~7htotal time
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1
CodingStart here. 26 questions · ~228 min
Library Sorting and CheckoutEasy
Practice

Sort books by title or author and process checkout requests efficiently using sorting and a hash map.

SortingZendesk
Merge Overlapping IntervalsMedium
Practice

Sort intervals by start time, then merge overlapping ranges into a minimal non-overlapping list.

ArraysSearchingSortingZendesk
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2
Execution6 questions · ~53 min
Refactor to Microservices Without DowntimeHard
Recently asked

Tests migration strategy, risk management, and operational thinking during architecture change.

migrationRollback PlanmicroservicesZendesk
Ticket Management System DesignHard
Recently asked

Tests backend modeling skills and ability to design APIs and data structures for ticketing.

rest apissolution designData ModelingZendesk
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3
Pipelines4 questions · ~35 min
High-Volume Event StreamingHard
Recently asked

Tests system design for streaming workloads, scalability, and event processing architecture.

InfrastructureStream ProcessingobservabilityZendesk
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4
System Design6 questions · ~53 min
Basic Systems Design and CodingMedium

Tests fundamentals of system design and coding practices for production-ready software.

system designCodingZendesk
Messaging API App and Zendesk-Like DesignHard

Evaluates system design skills and integration thinking for Zendesk-like workflows.

system designZendesk
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5
Behavioral & Leadership7 questions · ~61 min
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6
More topics1 question · ~9 min
Optimize a Slow SQL QueryHard

Tests advanced SQL tuning and ability to improve performance while preserving results.

SubqueriesJoinsCTEsZendesk
Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Second Highest Trader SalaryEasy
Practice
Practice drill

Find the second highest distinct salary from a single table using basic PostgreSQL ordering and limiting.

SubqueriesRankingSortingeClinicalWorksInformaticaSpectraforce Technologies
Top Customers by Net SalesMedium
Practice
Practice drill

Compute top 10 customers by net sales using joins and aggregations, ordering by revenue with deterministic tie-breaking.

SubqueriesJoinsData WranglingGain DigitalTCSZest AI
SQL Expected vs Actual ComparisonHard
Practice
Practice drill

Compare expected and actual 6sense QA results using a FULL OUTER JOIN, aggregation, NULL-safe comparisons, and CASE status logic.

SubqueriesJoinsData Wrangling6senseApex Systems
The finish line: interview-readyComplete all 50 questions plus 3 hands-on drills to finish this plan.