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Boston Consulting Group Solutions Architect Interview Questions

The questions to prepare for a Boston Consulting Group Solutions Architect interview. Questions from real interview reports rank first. Updated weekly.

10questions
~2htotal time
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1
CodingStart here. 4 questions · ~40 min
Linked List ReversalEasy
Practice

Reverse a singly linked list in-place using iterative pointer manipulation.

RecursionLinked ListsArraysBoston Consulting Group
Optimizing a Search AlgorithmMedium

Tests algorithmic thinking and performance optimization strategies.

Hash TablesArraysSearchingBoston Consulting Group
Sorting Algorithm Time ComplexitiesEasy

Tests algorithm knowledge and ability to reason about performance.

MathArraysSortingBoston Consulting Group
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2
More topics6 questions · ~59 min
SQL vs NoSQL Trade-offsEasy

Explain SQL vs NoSQL trade-offs, including schema design, consistency, scaling, and query flexibility.

JoinsData WranglingAggregationsBoston Consulting Group
Real-Time Data Processing DesignHard

Tests system design for streaming, reliability, and end-to-end data flow.

InfrastructureStream ProcessingOrchestrationBoston Consulting Group
Data-Driven Business DecisionMedium

Tests analytics thinking and translating data into business outcomes.

EstimationCompetitive AnalysisGrowth StrategyBoston Consulting Group
Data Integrity in Distributed SystemsHard

Tests consistency, correctness strategies, and failure-mode thinking.

IdempotencyData ModelingQualityBoston Consulting Group
Assessing Feasibility of New TechHard

Tests solution evaluation, risk assessment, and practical feasibility reasoning.

EstimationCompetitive AnalysisSWOTBoston Consulting Group
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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Calculate Monthly Sales Growth by Product CategoryMedium
Practice
Practice drill

Calculate month-over-month sales growth for each product category using JOINs and window functions.

JoinsAggregationsWayfairREVOLVEFanatics
Top Customers by Region VolumeMedium
Practice
Practice drill

Find the top 3 customers in each region by transaction volume using joins, aggregation, and window ranking.

Window FunctionsJoinsRankingJPMorganChaseSilicon Valley BankNavi
Month-over-Month Revenue Growth in SQLMedium
Practice
Practice drill

Calculate monthly revenue and month-over-month growth for a BCG consulting practice using aggregation and a self-join.

Window FunctionsDate FunctionsAggregationsBoston Consulting Group
The finish line: interview-readyComplete all 10 questions plus 3 hands-on drills to finish this plan.