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Updated weekly · Last refresh Sep 20

B Lab Global Software Engineer Interview Questions

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

41questions
~6htotal time
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1
CodingStart here. 9 questions · ~81 min
Reverse a String in PythonEasy
Practice

Reverse a string in Python using character traversal and return the reversed result.

StringsfunctionspythonB Lab Global
Implement Binary SearchEasy
Practice

Implement binary search to find a target value in a sorted array in O(log n) time.

Recursionbinary searchArraysB Lab Global
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2
Execution3 questions · ~27 min
Scope and Ship a New FeatureMedium

Explain how you would scope, align, and launch a feature with product and engineering while managing trade-offs and stakeholder expectations.

Roadmappingcross-functional collaborationScope ManagementB Lab Global
Balance Speed, Quality, and ScopeMedium

Describe how you handled a tough trade-off between shipping fast, maintaining quality, and reducing scope.

Trade-offsRisk AssessmentScope ManagementB Lab Global
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3
System Design3 questions · ~27 min
Scalable System DesignHard

Tests end-to-end system design thinking for scale, reliability, and user diversity.

Feature StoreRetrievalRecommendation SystemsB Lab Global
Redesigning Existing SystemsHard

Tests tradeoff analysis, risk management, and phased improvement planning.

ML RankingFeature StoreRecommendation SystemsB Lab Global
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4
Behavioral & Leadership23 questions · ~208 min
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5
More topics3 questions · ~27 min
Improve Query Execution TimeMedium

Tests understanding of DBMS concepts for improving query execution performance.

B Lab Global
Tune Spark Job PerformanceHard

Tests ability to optimize distributed data processing performance in production pipelines.

InfrastructureETLBatch ProcessingB Lab Global
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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Compare Weekly User Activity TrendsMedium
Practice
Practice drill

Aggregate user activity by week, then use LAG to compare sessions and watch time versus the prior active week.

Window FunctionsLag/LeadDate FunctionsB Lab GlobalTapadScale
SQL: Top Bottleneck StageMedium
Practice
Practice drill

Rank workflow stages by average processing time and return the top bottleneck for each workflow type.

Window FunctionsRankingperformanceOscar HealthB Lab Global
SQL: Throughput by RegionMedium
Practice
Practice drill

Join B Lab Global pipeline tables to calculate application, review, and certification throughput by region.

data accuracyJoinsGroup ByB Lab Global
The finish line: interview-readyComplete all 41 questions plus 3 hands-on drills to finish this plan.