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Dahl Consulting Software Engineer Interview Questions

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

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1
SQL & Data ManipulationStart here. 5 questions + 3 drills · ~70 min
Handling Deadlocks in Concurrent TransactionsMedium

Explain how to detect, prevent, and recover from deadlocks in concurrent PostgreSQL transaction workloads.

deadlocksdatabase managementmysqlDahl Consulting
Banking Transaction Locking StrategiesEasy

Explain optimistic and pessimistic locking for banking transactions, including tradeoffs, failure handling, and when each approach is appropriate.

JoinsData WranglingCase WhenDahl Consulting
Index Scan vs Index SeekMedium

Tests your database performance intuition and ability to choose the right indexing and query strategies.

Performance TuningindexessqlDahl Consulting
Hierarchical Category Schema DesignHard

Tests your data modeling skills for hierarchical data and your ability to design for scale and query performance.

schema designDahl Consulting
Business Logic in Oracle Stored ProceduresMedium

Tests your judgment about where business logic should live and the operational tradeoffs of stored procedures.

stored proceduresDahl Consulting
SQL Queries for RankingMedium
Practice
Practice drill

Rank active HSBC employees by division and return every employee tied for the highest or second-highest salary.

javasqlHsbc
SQL Join With Matching and Non-MatchingMedium
Practice
Practice drill

Use a FULL OUTER JOIN and CASE expression to identify matched and unmatched OneTrust QA test cases and executions.

JoinsData WranglingCase WhenHealth CatalystGoodwill Industries Of TulsaOneTrust
Message Senders Without Voice JoinsEasy
Practice
Practice drill

Use conditional aggregation on a single event table to find users who sent messages but never joined Discord voice channels.

JoinsData WranglingCase WhenDiscord
2
Behavioral & Leadership19 questions · ~152 min
Explaining Technical Complexity to Business PartnersEasy

Tests communication of complex technical ideas to non-technical partners, including clarity, stakeholder alignment, and influence on decisions.

Stakeholder ManagementCommunicationexplanationDahl Consulting
Leading a Deadline-Critical DeliveryMedium

Tests prioritization under pressure, ownership, and stakeholder alignment when leading a high-stakes project on a compressed timeline.

LeadershipOwnershipPrioritizationDahl Consulting
More Behavioral & Leadership questions with a free account
3
More topics1 question · ~8 min
Kafka Delivery SemanticsMedium

Tests understanding of Kafka semantics and implications for correctness in data pipelines.

Stream ProcessingkafkaIdempotencyDahl Consulting

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The finish line: interview-readyComplete all 25 questions plus 3 hands-on drills to finish this plan.