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Updated weekly · Last refresh Aug 30

T-Mobile Software Engineer Interview Questions

The questions to prepare for a T-Mobile Software Engineer interview. Questions from real interview reports rank first. Updated weekly.

50questions
~8htotal time
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1
CodingStart here. 17 questions · ~155 min
Longest Unique Substring in EnoMedium
Practice

Use a sliding window and hash map to find the longest substring without repeated characters in a string.

Hash TablesStringsTwo PointersT-Mobile
Implement Binary Search AlgorithmEasy
Practice

Write a binary search function to find a target value in a sorted array.

SearchingT-Mobile
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2
Execution7 questions · ~64 min
Balancing Speed Quality and ScopeHard

Describe a time you had to choose between speed, quality, and scope, and how you aligned stakeholders around the trade-off.

Trade-offsRisk AssessmentScope ManagementT-Mobile
Handling a Deadline RiskMedium

Tests your prioritization, risk management, and execution planning skills.

Rollback PlanScope ManagementT-Mobile
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3
System Design5 questions · ~46 min
Microservices for Telecom BillingHard

Tests your ability to decompose services and manage data, reliability, and integration boundaries.

InfrastructureData ModelingT-Mobile
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4
Behavioral & Leadership16 questions · ~146 min
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5
More topics5 questions · ~46 min
SQL for Large BI ExtractsMedium

Tests your SQL and data manipulation skills for extracting and preparing large datasets for BI.

databaseT-Mobile
AI Role: ETL and Data PipelinesMedium

Evaluates your experience with AI/data pipelines and your ability to describe technical work clearly.

AIdata processingETLT-Mobile
LTE and Cellular Network ConfigurationMedium

Assesses your telecom infrastructure knowledge relevant to cellular connectivity.

NetworkingT-Mobile
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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 50 questions plus 3 hands-on drills to finish this plan.