Google Interview Questions
Practice 467 real Google interview questions for 2026 — Google interview questions that cover Coding & Algorithms, Behavioral & Leadership, Analytics & Experimentation, Machine Learning, and Statistics & Math across Software Engineer, Data Scientist, Machine Learning Engineer, and Product Manager roles. Real questions from actual interviews with detailed solutions tailored for interview preparation and role-specific skill building. Expect coding-heavy rounds and design-focused conversations first, then analytics and behavioral assessments that probe impact, collaboration, and "Googleyness." For Software Engineer candidates this collection emphasizes string and substring matching, memory-efficient undo/redo and batched state operations, graph/time-series connectivity and queue problems, plus scaling for huge inputs and behavioral scenarios about teamwork and ambiguity. Data Scientist questions repeat themes in causal and unbiased upgrade experiments, bootstrap inference and percentile estimation from buckets, sampling and subarray algorithms, and sequence analytics. Machine Learning Engineer prompts focus on LLM lifecycle and trade-offs, recommendation and cold-start ranking strategies, weighted sampling and search, and building chatbots over mixed structured/unstructured data. Product Manager items center on Google Maps/Android product ideation, real-time data throughput and estimation, market sizing, and explaining technical tradeoffs to non-technical stakeholders. Use targeted coding practice, mock design interviews, experiment design drills, and concise STAR stories for best results.
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Design feedback-driven recommender
Design feedback-driven recommender Design: Contextual Bandit Recommendation with Online Learning You are designing an online learning recommendation s...
Find fair split of a two-color necklace
Given a circular necklace represented by a string s over {'a','b'}, you may cut the necklace at most twice (yielding three contiguous pieces). Can you...
Find numbers with exactly two sum-of-squares forms
Given an integer \(n\), find all integers \(s\) such that \(0 \le s < n\) and \(s\) can be expressed as a sum of two squares in exactly two distinct u...
Describe a conflict with a colleague
In a behavioral interview for a software engineering or technical role, you are asked: > Tell me about a time you had a conflict or disagreement with ...
Generate all subsets (handle duplicates)
Problem Given an integer array nums, return all possible subsets (the power set). Part A (no duplicates) Assume all elements in nums are distinct. Ret...
Maximize Boundary-Difference Subarray Sum
Given an integer array nums and an integer k, find the maximum possible sum of a non-empty contiguous subarray whose first and last elements differ by...
Explain and resolve Simpson’s paradox
Define Simpson’s paradox and construct a concrete numeric example where group-wise success rates favor treatment in each subgroup but the aggregate ra...
Analyze data duplication effects in linear regression
OLS With Duplicated Observations: Estimator, Variance, and Inference Pitfalls Context: You have the linear model y = Xβ + ε with full-rank X ∈ ℝ^{n×p}...
Answer common collaboration behavioral questions
Behavioral interview prompts Answer the following behavioral questions with concrete examples (use the STAR or CAR framework). Focus on your specific ...
Explain LLM fine-tuning and generative models
ML Fundamentals — LLM & Generative AI Track You are interviewing for an ML-focused engineering role. After a short résumé walkthrough, the interviewer...
Describe a challenging recent project
Behavioral Tell me about a challenging and interesting project you worked on recently. Follow-ups - What were the hardest problems you encountered? - ...
Min boards to cover roof holes
You are given an m x n binary grid roof representing a roof surface: - roof[i][j] = 1 means the cell is intact. - roof[i][j] = 0 means the cell is a h...
Design a waitlist system with top/bottom K
Object-Oriented Design: Waitlist System Design and implement (at the class/interface level) a waitlist system that supports the following operations: ...
Why Would Users Care and Why Build It?
You are interviewing for a Google Product Manager role. Assume the product is a new Google AI productivity assistant integrated into Search, Gmail, Do...
Clarify ambiguous requirements under pressure
Behavioral & Leadership Prompt — Problem Understanding and Clarification (Data Scientist, Technical Screen) Part 1 — Past Experience Describe a time y...
Handle highly imbalanced classification data
You must build a binary classifier for fraud with a 0.2% positive rate and 10M rows × 500 features. Propose an end-to-end plan that covers: 1) data sp...
Handle conflict, priorities, and ownership scenarios
Behavioral interview prompts Answer the following behavioral questions. Use concrete examples from your experience. 1) Disagreement / conflict - Descr...
Find median of merged RLE arrays
Problem You are given two run-length encoded (RLE) arrays A and B. Each is sorted by value in non-decreasing order. - Each element is a pair (value, f...
Maximize sum without choosing adjacent elements
Problem You are given an integer array nums where nums[i] is the value in position i. Select a subset of indices such that no two selected indices are...
Find where to cut cake into equal areas
Cut a cake so both sides have equal area A cake is made of N rectangular blocks arranged left-to-right in a straight line (no gaps, no overlap). Block...