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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"I've used LC, Glassdoor, and random Discords. Nothing comes close to the accuracy here. The questions are actually current — that's what got me. Felt like I had a cheat sheet during the interview."
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"Literally just signed a $600k offer. I only had 2 weeks to prep, so I focused entirely on the company-tagged lists here. If you're targeting L5+, don't overthink it."
"Coaches and bootcamp prep courses cost around $200-300 but PracHub Premium is actually less than a Netflix subscription. And it landed me a $178K offer."
"I honestly don't know how you guys gather so many real interview questions. It's almost scary. I walked into my Amazon loop and recognized 3 out of 4 problems from your database."
"Discovered PracHub 10 days before my interview. By day 5, I stopped being nervous. By interview day, I was actually excited to show what I knew."
"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."
"The search is what sold me. I typed in a really niche DP problem I got asked last year and it actually came up, full breakdown and everything. These guys are clearly updating it constantly."
Maximize 1D deliveries within distance and minimize total distance
You are given positions on a 1D line: - people: an array of N integers (positions of people) - shops: an array of M integers (positions of milk-tea sh...
Find shortest subarray with at least k distinct
Problem Given an integer array nums and an integer k, find the length of the shortest contiguous subarray that contains at least k distinct integers. ...
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...
Compute minimum meeting rooms on circular day
Problem You are given a list of meetings scheduled within a 24-hour day. Time is cyclic: after 23:59 the next minute is 00:00. Each meeting is represe...
Describe a challenging project and how you succeeded
Behavioral prompts Answer the following using a structured format (e.g., STAR: Situation, Task, Action, Result), focusing on your contributions, trade...
Find Earliest Fully Connected Time
You are given n people labeled 0 to n - 1 and a list of friendship logs. Each log has the form (timestamp, personA, personB, action), where action is ...
Find maximum value in huge text file
You are given the path to a very large text file on disk. The file has the following properties: - Each line contains exactly one signed 64-bit intege...
Find longest duplicated substring
You are given a string s consisting of lowercase English letters. A substring of s is any contiguous sequence of characters, i.e., s[i..j) for 0 ≤ i <...
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...
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...
When do you use mixed-effects models
You are modeling a user outcome (e.g., watch time or retention) across many countries and many users. Observations are nested (multiple days per user;...
Design feedback-driven recommender
Design feedback-driven recommender Design: Contextual Bandit Recommendation with Online Learning You are designing an online learning recommendation s...
Recommend top-K movies from similarity graph
Movie Recommendation: Top K You are building a simple movie recommendation feature. Input - A set of movies 0..(M-1). - An undirected similarity graph...
Design at-least-once notification delivery
System Design: At-Least-Once Notification System Context Design a multi-channel notification platform (email, SMS, push, in-app) that guarantees at-le...
Compute max coins with 3-step token moves
You are given a one-dimensional board with n positions represented by a string s of length n: - . = empty cell - T = token - C = coin You may move tok...
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...
Googleness & Behavioral Deep-Dive
PM Onsite Behavioral and Product Critique Prompts You are a Product Manager candidate in an onsite interview. Respond concisely in two to three minute...
Build vs. Buy Decision Framework
Product Decision Prompt: Build vs. Buy Framework Your team needs to deliver a new system to support a product. You can either build it in-house or buy...
Find largest subset sharing a common digit
You are given an array nums of length N (1 ≤ N ≤ 100). Every element is a two-digit integer between 10 and 99 (inclusive). Select as many elements as ...
Lead a deep dive on your most complex project
Past project deep dive (Staff/L6) Pick the most complex system you’ve worked on and be prepared for a 30–45 minute deep dive. Expect probing questions...