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Dia&Co Interview Questions

The questions to prepare for Dia&Co interviews, across all roles. Questions from real interview reports rank first. Updated weekly.

21questions
~3htotal time
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1
CodingStart here. 9 questions · ~88 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
Implement Binary SearchEasy

Tests algorithm implementation skills and correctness reasoning.

RecursionArraysSearchingDia&Co
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2
Execution8 questions · ~78 min
Prioritize Work Under Tight DeadlinesEasy

Explain how you prioritize competing work under time pressure while making trade-offs and keeping stakeholders aligned.

Trade-offsRoadmappingScope ManagementDia&Co
Explain Technical Work to Business StakeholdersMedium

Show how you translate technical concepts into clear business language for non-technical stakeholders during project execution.

Stakeholder ManagementTechnical FluencyCommunicationDia&Co
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3
More topics4 questions · ~39 min
Cloud Platform Experience for PipelinesMedium

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

InfrastructureETLData ModelingDia&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
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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 Top N QueryEasy
Practice
Practice drill

Return the 10 most-viewed active California physician profiles using WHERE, ORDER BY, and LIMIT.

RankingSortingAggregationsDoximity
Contact Center Agent Performance MetricsHard
Practice
Practice drill

Compute daily agent call KPIs and SLA using joins, aggregations, and window ranking in a contact center model.

ETLAggregationsData ModelingADP
The finish line: interview-readyComplete all 21 questions plus 3 hands-on drills to finish this plan.