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dv01 Backend Engineer Interview Questions

The questions to prepare for a dv01 Backend Engineer interview. Questions from real interview reports rank first. Updated daily.

20questions
~3htotal time
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1
System DesignStart here. 8 questions · ~64 min
Ensuring Distributed Data ConsistencyMedium

Assesses how you maintain correctness and integrity in distributed systems.

distributed systemsconsistencydata integritydv01
High-Throughput Data IngestionHard

Evaluates your system design for scalable, reliable ingestion of high-volume financial data.

system architecturescalabilitydata ingestiondv01
SQL vs NoSQL Trade-offsMedium

Evaluates your ability to choose appropriate storage models and justify trade-offs.

data managementdatabase designdv01
Schema Evolution for Legacy APIsMedium

Evaluates your strategy for backward compatibility and safe evolution of API contracts.

api designlegacy systemsschema evolutiondv01
Rate Limiting and Auth in MicroservicesMedium

Evaluates your security and traffic-control design for distributed backend services.

authenticationrate limitingmicroservicesdv01
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2
Behavioral & Leadership10 questions · ~80 min
Maintaining Code Quality Under SpeedMedium

Tests ownership and prioritization in balancing delivery speed with maintainable mobile code and deliberate technical debt management.

best practicesfast-paced environmentcode maintainabilitydv01
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3
More topics2 questions · ~16 min
Handling Failures and HAMedium

Tests your approach to resilience, failover, and maintaining availability during failures.

failure managementhigh availabilitydv01
Optimizing Queries for Large DatasetsMedium

Tests your skills in query optimization to improve performance and scalability for BI workloads.

Performance Tuninglarge datasetsquery optimizationdv01

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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Top 5 Loans by RegionMedium
Practice
Practice drill

Identify the five highest-balance loans within each geographical region using regional ranking.

Window FunctionsJoinsData Manipulationdv01
Second Highest Without AggregatesHard
Practice
Practice drill

Find the second highest salary in each department without using aggregate functions.

SubqueriesRankingSelf-JoinsCredit GenieCisco Restaurant + BarDevoteam
Optimize a Slow SQL QueryHard
Practice
Practice drill

Rewrite a slow PostgreSQL loan payment query to reduce scanned rows while preserving the required aggregated results.

database optimizationJoinsData WranglingAmeripriseEEltro Cyberchrome PrivateEnergyHub
The finish line: interview-readyComplete all 20 questions plus 3 hands-on drills to finish this plan.