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Updated weekly · Last refresh Oct 17

AT&T Software Engineer Interview Questions

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

50questions
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1
SQL & Data ManipulationStart here. 9 questions + 1 drill · ~96 min
2
Coding19 questions · ~181 min
Unique Pairs Sum to TargetEasy
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Find all unique value pairs summing to a target with a hash set in expected O(n) time.

Hash TablesArraysTwo PointersAT&T
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3
System Design8 questions · ~76 min
Scalable Real-Time Data RequestsHard
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Assesses scalability, performance, and architecture choices for high-throughput real-time traffic.

scalabilityAT&T
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4
Technical Fundamentals3 questions · ~29 min
String vs StringBuilderMedium
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Tests knowledge of Java string immutability and performance implications.

AT&T
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5
Execution3 questions · ~29 min
Handle a Crashing Chat ApplicationMedium
Recently asked

Assesses incident response thinking and debugging/reliability practices for production systems.

AT&T
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6
Behavioral & Leadership5 questions · ~48 min
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7
More topics3 questions · ~29 min
Explain MIMO in CommunicationsMedium
Recently asked

Assesses your understanding of communications concepts relevant to wireless systems.

NetworkingAT&T
Microservices Communication OverviewMedium
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Tests your knowledge of common inter-service communication mechanisms in microservices.

InfrastructureAPIsDependenciesAT&T
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The finish line: interview-readyComplete all 50 questions plus 1 hands-on drill to finish this plan.