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Top 29
Prep plan
Updated weekly · Last refresh Aug 30

CertiK Software Engineer Interview Questions

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

29questions
~5htotal time
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1
CodingStart here. 11 questions · ~106 min
Maximize Profit from Stock PricesEasy
Practice

Calculate the maximum profit from buying and selling stock once.

CertiK
Check Binary Tree BalanceEasy
Practice

Use postorder recursion to determine whether a binary tree is height-balanced in O(n) time.

RecursionSearchingTreesCertiK
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2
Execution3 questions · ~29 min
Scalability in MicroservicesHard

Tests execution-level thinking about scaling microservices, including deployment and operational strategies.

InfrastructureTrade-offsRisk AssessmentCertiK
API Design ConsiderationsMedium

Tests API design tradeoffs including usability, security, and reliability.

Trade-offsSuccess CriteriaScope ManagementCertiK
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3
Behavioral & Leadership11 questions · ~106 min
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4
More topics4 questions · ~39 min
Blockchain Transaction Processing DesignHard

Tests system design for reliable, scalable transaction processing in a blockchain context.

InfrastructureData ModelingQualityCertiK
Detect Fraud in Transaction HistoriesMedium

Tests data analysis and fraud detection approaches using transaction history data.

Window FunctionsData WranglingAggregationsCertiK
Design a Decentralized Identity dAppHard

Tests system design for secure decentralized identity workflows and architecture choices.

Feature StoreModel ServingRecommendation SystemsCertiK
Compute Working Hours Between DatesMedium

Tests your ability to translate time-window requirements into correct logic.

calculationsCertiK

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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
Top Daily Rides by VehicleMedium
Practice
Practice drill

Rank the top 3 completed rides per vehicle per day using joins, a CTE, and ROW_NUMBER.

Window FunctionsJoinsData WranglingWaymo
Monthly Claims Trend and Anomaly DetectionHard
Practice
Practice drill

Use joins, CTEs, aggregations, and date functions to flag unusual monthly claim patterns by provider.

Window FunctionsData WranglingAggregationsModaGlobal Healthcare Exchange
The finish line: interview-readyComplete all 29 questions plus 3 hands-on drills to finish this plan.