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Updated weekly · Last refresh Oct 17

BlackRock Software Engineer Interview Questions

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

50questions
~11htotal time
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1
System DesignStart here. 9 questions · ~114 min
Design Word Count at ScaleHard

Design a scalable word count system with batch and near-real-time processing, low latency, and reliable aggregation.

latencyFeature Storedistributed systemsBlackRock
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2
Coding11 questions · ~140 min
Balanced Parentheses in JSONMedium
Practice

Check whether parentheses are balanced in a JSON-like string using a stack.

Basic AlgorithmsData StructuresAlgorithmsBlackRock
Synchronized KeywordMedium
Practice

Implement a thread-safe counter and explain how synchronization prevents race conditions.

Codingclean codeData StructuresBlackRock
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3
SQL & Data Manipulation11 questions · ~140 min
Fourth Highest Salary in SQLMedium
Practice

Identify every employee earning the fourth-highest distinct non-NULL salary using PostgreSQL ranking.

Data Manipulationsqldatabase queryingBlackRock
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4
Execution5 questions · ~64 min
Choosing Monolith vs MicroservicesMedium
Recently asked

Explain how you would decide between a monolith and microservices for a new engineering initiative.

Trade-offsRisk AssessmentScope ManagementBlackRock
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5
Pipelines4 questions · ~51 min
Fault Tolerance in Data PipelinesHard
Recently asked

Approach for building fault tolerance into a distributed data pipeline, including retries, idempotency, and recovery controls.

InfrastructureIdempotencyQualityBlackRock
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6
Security & Infrastructure5 questions · ~64 min
Terraform Multi-Account Multi-RegionMedium
Recently asked

Assesses your infrastructure-as-code understanding for complex cloud organizational structures.

terraformCloudBlackRock
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7
More topics5 questions · ~64 min
Explain the internal mechanics of a Map in JavaHard
Recently asked

Explains how HashMap uses hashing, buckets, collision handling, resizing, and equals/hashCode to store and retrieve entries.

javaJVM InternalsData StructuresBlackRock
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