Top 29
Prep plan
Updated weekly · Last refresh Aug 30
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ThoughtWorks Backend Engineer Interview Questions

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

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~4htotal time
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1
System DesignStart here. 12 questions · ~97 min
API Design ChallengesMedium

Assesses how you design robust APIs and reduce integration and operational risks.

challengesapi designmitigationTThoughtWorks
Database Trade-offs for ScaleMedium

Assesses your ability to choose and justify database technologies for performance and reliability.

Trade-offsTThoughtWorks
URL Shortening for High ThroughputHard

Assesses your system design for throughput, storage strategy, and correctness under heavy traffic.

throughputscalabilityTThoughtWorks
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2
Behavioral & Leadership13 questions · ~105 min
Influencing a High-Stakes Technical DecisionMedium

Tests influence without authority through stakeholder management, clear communication, and ownership of a consequential decision.

Influence Without AuthorityStakeholder ManagementCommunicationTThoughtWorks
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3
More topics4 questions · ~32 min
Clean Maintainable Test CodeEasy

Explain how to write automated tests that stay readable, isolated, and easy to update as code changes.

Hash TablesArraysStringsTThoughtWorks
Zero-Downtime PostgreSQL Schema MigrationsHard

Explain how to run PostgreSQL schema migrations without downtime while preserving compatibility, integrity, and performance.

schema migrationsdatabase managementproduction environmentTThoughtWorks
Pair Programming StrategiesMedium

Evaluates collaboration practices and how you improve code quality through pairing.

CommunicationcollaborationTThoughtWorks
SQL vs NoSQL SelectionMedium

Evaluates your ability to map data and access patterns to the right storage technology.

nosqlsqlTThoughtWorks

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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
The finish line: interview-readyComplete all 29 questions plus 3 hands-on drills to finish this plan.