Top 32
Prep plan
Updated weekly · Last refresh Aug 30

T-Mobile AI Engineer Interview Questions

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

32questions
~5htotal time
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1
CodingStart here. 7 questions · ~69 min
Implementing a Basic Neural NetworkHard
Practice

Implement a deterministic one-hidden-layer neural network with sigmoid activation and batch backpropagation for binary classification.

Neural NetworksArraysMatrixT-Mobile
Two Sum with TargetEasy
Practice

Use a hash map to find two array elements that sum to a target in O(n) time.

Hash TablesArraysStringsT-Mobile
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2
System Design5 questions · ~49 min
Design an LLM Serving PlatformHard

Design an LLM serving system that balances latency, cost, scalability, and safety for production traffic.

Cold StartFeature StoreModel ServingT-Mobile
Design Feature Drift Monitoring SystemHard

Design a production ranking system with robust feature drift monitoring across batch and real-time features at high QPS.

Feature StoreFeature DriftModel ServingT-Mobile
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3
Generative AI & LLMs5 questions · ~49 min
Investigate Poor LLM Answer QualityMedium

Diagnose why a customer-facing LLM assistant is underperforming, using eval-first debugging across retrieval, prompting, safety, latency, and cost.

HallucinationPrompt EngineeringLLM EvaluationT-Mobile
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4
Machine Learning5 questions · ~49 min
Handling Missing Values in MLEasy

Explain practical strategies for handling missing values in a supervised learning workflow, from diagnosis to modeling and validation.

Cross-ValidationFeature EngineeringRegularizationT-Mobile
Feature Selection in Supervised LearningMedium

Explain a practical approach to feature selection, including filtering, embedded methods, and validation against overfitting.

Feature EngineeringDeep LearningSupervised LearningT-Mobile
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5
Behavioral & Leadership8 questions · ~79 min
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6
More topics2 questions · ~20 min
Evaluate a Churn ModelMedium

Explain which metrics matter for evaluating a churn model and how to choose them based on retention costs and business goals.

F1 ScorePrecisionAUC-ROCT-Mobile
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The finish line: interview-readyComplete all 32 questions to finish this plan.