Google Coding & Algorithms Interview Questions
Practice 461 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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Answer common behavioral questions for new grad
You are in a 35-minute behavioral round for a new-grad software role. Prepare concise, structured answers (1–3 minutes each) to the following question...
Choose optimal guesses for green-only Wordle
Problem You are playing a simplified 5-letter word guessing game. - There is a hidden secret word of length 5. - You have a dictionary of valid 5-lett...
Build and evaluate illegal-video classifier
End-to-End ML System Design: Flag Illegal YouTube Videos You are tasked with designing a production ML system to detect and triage potentially illegal...
Implement percentage RMSE and bootstrap its CI
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Establish causality: commute playlist and driving speed
A lawyer worries that listening to a "Commute" playlist in a mobile app makes users drive faster. As the DS: a) Define the population, unit of analysi...
Narrow a confidence interval for a mean
You have a simple random sample with n = 100 and sample mean 100. The current 95% CI for the population mean is 100 ± 10, which a PM says is too wide....
Estimate unbiased ad scores with many reviewers
You have 1,000 ads and 100 reviewers; each reviewer rates 100 ads on a 1–10 scale with incomplete overlap. Specify a mixed-effects model to estimate l...
Diagnose and reverse an adoption-rate decline
Problem: Investigating a 7pp Drop in Google Meet Enterprise Adoption Rate Context Over the last 4 calendar weeks, enterprise adoption rate has fallen ...
Resolve conflict on trust versus growth priorities
Scenario You are an Engineering Analyst on a Trust/Integrity team. A senior Growth PM, with VP support, pushes to loosen an upload filter to boost Dai...
Find safe travel intervals between planet influences
You are planning a space route along a one-dimensional line (the x-axis). You are given a list of planets. Each planet is represented by an integer pa...
Historical FX-Rate Service – System Design
System Design: Historical FX Rates Service (10k QPS) Background You are designing an internal service for engineers and analysts to fetch historical c...
Explaining Technical Work to Non-Technical Stakeholders
Interview Prompt: Explain a Recent Project to a Non-Technical Audience Context You're interviewing for a Product Manager role in a technical/phone scr...
Google Strategic Foresight
Product Strategy Case: Threats and Technology Trends for Google (PM Onsite) Part A — Strategic Threats (5-year horizon) Identify the three biggest thr...
Behavioral & Execution Scenarios
Product Manager Phone Screen: STAR Examples With Metrics Provide concrete, role-relevant examples for each situation below. Focus on actions, trade-of...
Determine validity after digit-constrained deletions
You're given a string S of length n consisting only of '(' , ')' , and digits '0'–'9'. For every digit at index i with numeric value v: ( 1) you must ...
Maintain streaming median and loosemedian
Design a data structure for an online stream of positive integers supporting insert (x). After each insertion, output: (a) the median of all values se...
Design human review to estimate model accuracy
You need to estimate the accuracy of an ML classifier on a population of subjects. You can only afford K total human reviews. Each human review produc...
Generate Uniform Samples and Estimate Percentiles
Answer the following two probability/statistics questions. 1. You are given access to a function rand01() that returns independent samples from Unifor...
Discuss dissertation and supervision
Behavioral Interview: Dissertation Overview and Supervisor Collaboration Context You are in an onsite behavioral and leadership round for a Machine Le...
Estimate percentile from buckets
You are given an approximate histogram of search-query frequencies. Each bucket i is represented as (left_bd_i, right_bd_i, bucket_count_i), where: - ...