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Updated weekly · Last refresh Oct 17

Dia&Co Software Engineer Interview Questions

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

20questions
~4htotal time
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1
CodingStart here. 8 questions · ~86 min
Palindrome FunctionEasy
Practice

Use two pointers to determine whether a City National Bank reference label reads identically forward and backward.

RecursionStringsTwo PointersDia&Co
Linked List ReversalEasy
Practice

Reverse a singly linked list in-place using iterative pointer manipulation.

RecursionLinked ListsArraysDia&Co
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2
Execution8 questions · ~86 min
Resolve Conflict During Critical DeliveryEasy

Describe how you handled team conflict without losing delivery momentum or stakeholder confidence.

Trade-offsSuccess CriteriaRisk AssessmentDia&Co
Handling Critical Project FeedbackEasy

Explain how you respond to direct feedback or criticism while preserving relationships and keeping a finance project on track.

Trade-offsSuccess CriteriaRisk AssessmentDia&Co
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3
More topics4 questions · ~43 min
Cloud Platform Experience for PipelinesMedium

Describe practical experience building pipelines on AWS, including orchestration, security, and data quality.

InfrastructureETLData ModelingDia&Co
REST vs GraphQLEasy

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

Stakeholder ManagementCommunicationDia&Co
Optimizing Database QueriesMedium

Tests SQL performance knowledge including indexing, query plans, and data access patterns.

Joinsquery optimizationAggregationsDia&Co
Scaling for Increased TrafficMedium

Tests scalability thinking including architecture, load handling, and reliability.

InfrastructureSchedulingDependenciesDia&Co
Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Database Indexing Trade-OffsHard
Practice
Practice drill

Analyze a food-order total query and explain index trade-offs for filtering, joins, aggregation, and write overhead.

Trade-offsdatabase optimizationJoinsHelloFresh
Database Indexing Trade-offsHard
Practice
Practice drill

Compare PostgreSQL index strategies by read latency, write overhead, storage size, and an overall cost score.

Trade-offsdatabase optimizationdatabase managementHHostinger InternationalPPorch GroupCapital Technology Group
Database Trade-Offs for DetectionHard
Practice
Practice drill

Compare financial crime detection architectures using joined run metrics, aggregates, NULL handling, and ordered performance results.

fraud detectionTrade-offsdistributed databasesDeloitte
The finish line: interview-readyComplete all 20 questions plus 3 hands-on drills to finish this plan.