Google Interview Questions
Practice 463 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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"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."
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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? - ...
Design a waitlist manager
Object-Oriented Design: Waitlist Manager Design a waitlist management component (e.g., for a restaurant or event) that maintains FIFO order for partie...
Solve Shortest Paths and Rental Allocation
You are given two independent coding problems. Problem 1: Shortest path in a weighted graph You are given a weighted graph where each edge has a non-n...
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...
Find most co‑purchased product pairs in SQL
Given the schema and sample data below, write ANSI-SQL to return the top 5 unordered product pairs most frequently purchased together across distinct ...
How do you diagnose a ratio metric change
In an A/B test, the treatment group shows a statistically significant increase in a ratio metric: - CTR = clicks / impressions increased by +1.2% rela...
Design distributed message queue service
Design a Distributed Message Queue for High Throughput and Large Payloads Context You are asked to design a distributed message queue system that supp...
Apply Range Overwrite Queries
You are given an integer array nums of length n and a list of range-assignment queries. Each query is a tuple (left, right, value), where left and rig...
Find mode in a trinary search tree
You are given the root of a trinary search tree where each node has up to three children: `text class Node { int val; Node left; // all values ...
Check if all substrings are dictionary words
You are given a string s (letters only) and access to an English dictionary dict (a set of valid words). Return true if every contiguous substring of ...
Design a global real-time notification system
Problem Design a global, real-time notification system that can deliver messages via: - Mobile/Web push - Email - SMS The system supports 100M+ users ...
Compute Turnstile Crossing Times
You are given n people waiting to use a single-door turnstile. Each person has: - time[i]: the time when person i arrives at the turnstile. - directio...
How do you handle conflict and ambiguity?
You are asked a series of detailed behavioral questions. Answer each with specific context, actions, and measurable outcomes. Conflict, teamwork, and ...
Design a global restaurant menu update system
Design a menu update system for a global chain of restaurants. Context: - The chain operates in many countries. - Each restaurant may have multiple ki...
Answer leadership and quality tradeoff questions
Answer the following behavioral questions with specific examples. 1. Describe a project you led. Why was it challenging? 2. Have you changed any hobbi...
Compute monthly CRR with merges and gaps
You are given PostgreSQL tables user_profile(user_id, signup_ts, country, is_employee, is_test), user_events(user_id, event_ts, event_type, revenue, p...
Determine winner in stack-merging game
Game: Babylon stack merging (two-player, perfect play) You are given a two-player turn-based game. There are n stacks of tiles. Each stack has: - a he...
Solve Two Array Optimization Problems
You are given two coding problems from the same interview round. Problem 1: Split a gold chain fairly An array weights represents the weights of conse...
Find top/bottom-k words in list or stream
You are given words (strings) either as a finite list or as an unbounded stream. 1) List version: Given an array words and an integer k, return: - the...
Design a logger that returns top-K messages
Problem Design an in-memory logging component that supports recording log events and querying the top K most frequent messages. Each log event has: - ...