Dataford
Dataford
Top 24
Prep plan
Updated weekly · Last refresh Oct 17

CertiK Software Engineer Interview Questions

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

24questions
~4htotal time
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1
CodingStart here. 8 questions · ~79 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 · ~30 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 & Leadership9 questions · ~89 min
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4
More topics4 questions · ~39 min
Compute Working Hours Between DatesMedium

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

calculationsCertiK
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

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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Handling Missing DataEasy
Practice
Practice drill

Replace missing sales fields with defined defaults and return a consistently ordered dataset.

missing valuesdata cleaningnull handlingUniversity of MinnesotaThe Home DepotNationwide
Running Total and User RankingMedium
Practice
Practice drill

Calculate user revenue running totals and daily rankings using PostgreSQL window functions.

Window FunctionsDate FunctionsData ManipulationCCourseraCertiK
Top 3 Users by Monthly SpendMedium
Practice
Practice drill

Rank users by monthly spend and return everyone tied within the top three positions.

Window FunctionsDate FunctionsRankingCertiK
The finish line: interview-readyComplete all 24 questions plus 3 hands-on drills to finish this plan.