Google Machine Learning Engineer Interview Questions
Preparing for Google Machine Learning Engineer interview questions requires understanding that Google evaluates both algorithmic fundamentals and production-ready system thinking. Unlike pure research interviews, the process typically balances coding, applied ML, and ML system design: expect rounds on algorithms and data structures, hands-on applied-ML problem solving such as feature engineering and evaluation metrics, design discussions about model serving and scalability, and behavioral “Googliness” conversations. Interviewers focus on clear problem scoping, trade-off reasoning, experimental rigor, and the ability to communicate complex ideas to product and engineering partners. What to expect and how to prep: anticipate a recruiter screen, one or more technical screens, ML system-design and applied-ML rounds, plus behavioral interviews; feedback is reviewed by an independent hiring committee before team matching. Effective interview preparation mixes focused practice on coding and statistics, mock system-design walkthroughs, concrete project stories with measurable impact, and rehearsed, structured explanations of model choices and monitoring strategies. Practice thinking aloud, quantify results, and be ready to explain failure modes and mitigations—those

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Design a fraud detection system
Scenario You are designing an end-to-end fraud detection system for an online platform (e.g., e-commerce marketplace, payments, account signup, or ad ...
Design a chatbot over structured and unstructured data
Design a chatbot that can answer user questions using both: - Structured data (e.g., relational tables such as orders, products, pricing, user account...
Compute sum over consecutive-step subarrays
Given an integer array a of length n, call a subarray a[l..r] good if either: - it is strictly increasing by 1 at every step: a[i+1] - a[i] = 1 for al...
Answer conflict, failure, and proud project questions
Behavioral questions Answer the following behavioral prompts using real examples from your experience: 1. Conflict: Tell me about a time you had a con...
Design large-scale near-duplicate video detection
Design a product-grade fuzzy (near-)duplicate detection system for a large short-video platform. You need to detect whether an uploaded video is a nea...
Compare NLP tokenization and LLM recommendations
You’re interviewing for an NLP-focused ML role. Part A — NLP fundamentals: tokenization Explain and compare common tokenization approaches used in mod...
Design a real-time recommendation system
You are asked to design a real-time recommendation system for a large-scale consumer product (for example, recommending items or content to users in a...
Explain GRPO-style training for diffusion models
You are given a pretrained image diffusion model that generates images conditioned on text prompts (e.g., a text-to-image model). You now want to fine...
Design data structure similar to LRU cache
You are asked to design and implement a data structure that behaves similarly to an LRU (Least Recently Used) cache, but with a small variation: - The...
Solve several streaming, DAG, and DP tasks
You were asked multiple algorithmic questions. 1) Streaming longest subarray with average S You receive an infinite stream of integers (can be positiv...
Design ML system for self-driving perception
You are interviewing for a Senior Machine Learning Engineer role on a self-driving car team. They ask you to design a machine learning system for obst...
Construct connected crop layout and safe paths
Problem A — Construct a garden with connected crop regions You are given an N × M rectangular grid (a garden) that must be fully planted using k crop ...
Respond to long-term concerns after A/B success
Your model performs well in an A/B test (statistically significant lift on the primary metric). However, your manager believes the model may harm long...
Solve meeting scheduling and robot cleaning tasks
You are given two independent coding problems. --- Problem 1: Prioritized Meeting Scheduling You are asked to schedule meetings in a single meeting ro...
Describe conflict and failure using STAR framework
You are in a behavioral interview for a software/ML engineering role. The interviewer asks you to: 1. Describe a time you faced a significant conflict...
Explain ML model fundamentals
Comprehensive ML Concepts: Logistic Regression, Naive Bayes, Transformers, Multi-class Metrics, Bagging vs Boosting Context You are interviewing for a...
Generate values by weighted probabilities
Weighted Random Sampling Generator (Streaming) You are given: - A list of distinct integers values. - A matching list of nonnegative probabilities (we...
Explain transformer architecture and variants
Technical Screen: Explain the Transformer Architecture Scope Provide a structured deep-dive into Transformers. Your explanation should cover theory, s...
Design feedback-driven recommender
Design: Contextual Bandit Recommendation with Online Learning You are designing an online learning recommendation system. At each user interaction: - ...
Design a reaction-factor prediction system
End-to-End System Design: Predicting a Reaction Factor from Molecule Pairs Context and goal - You have a tabular dataset with columns: - molecule1_n...