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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"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."
Boolean Expression Tree with Leaf Flips
Boolean Expression Tree with Leaf Flips You are given a boolean expression represented as a tree. - Each leaf node holds a boolean value: true or fals...
Most Active Users in a Live Communication Stream
Most Active Users in a Live Communication Stream You are processing a continuous stream of pairings between users. Each event is an unordered pair (u,...
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...
Choose best/worst actions in workplace ethics scenarios
You are taking a situational judgment test (SJT). For each scenario below, the test presents four possible actions. You must select: - Most likely / b...
Determine whether two nodes are related
Problem You are given genealogy information for a set of chickens. The data consists of parent → child relationships (e.g., (parentId, childId) pairs)...
Design street-view image ingestion and storage system
Prompt Design a system to ingest, store, and process street-level images for a "Street View"-like product. Scenario - A fleet of taxis is equipped wit...
Design an ads retrieval service using a heap
Object-Oriented Design: Ads Retrieval (Priority-Based) Design a component that manages ads and supports retrieving the “best” ads based on a score. Re...
List regularization methods and trade-offs
Question: Compare Regularization Techniques and When to Use Them Context: You are interviewing for a machine learning engineering role and are asked t...
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...
Compute minimal transfers to settle group expenses
Problem A group of friends go on a trip and share expenses. Each expense is recorded as an object: - payer (string): who paid the full amount - amount...
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: - ...
Answer range queries for alternating parity subarrays
Problem You are given an integer array nums of length n and q queries. Each query is a pair [l, r] (0-indexed, inclusive). A subarray nums[l..r] is ca...
Implement Memory-Efficient Document Undo/Redo
You are implementing a simplified document layer for a design tool. The document is a map from string key to string value. Implement a data structure ...
Analyze video flags and reviews with SQL
You are designing SQL queries for YouTube Trust & Safety. Use the schema and sample data below. Unless stated otherwise, treat a flag as reviewed if t...
Design a rolling hit counter API
Rolling hit counter (time/space optimized) Design a data structure that records events (“hits”) and can return how many hits happened in the most rece...
Find longest increasing contiguous subarray
Problem You are given an integer array nums (length n). Part 1 Find the length of the longest contiguous subarray that is strictly increasing (i.e., f...
Minimize calls to find all bad test pairs
You have \(n\) atomic tests \(t_1, t_2, \dots, t_n\). You are given access to a black-box function: `python bool runTest(set<Test> S) ` which behaves ...
Compute city skyline outline
You are given a list of rectangular buildings in a 2D city skyline. Each building is represented by three integers [L, R, H]: - L: the x-coordinate of...
Find Minimum Rooms Needed
You are given a list of meeting intervals, where each interval is represented as [start, end) and start < end. Two meetings conflict if their time ran...
Find Shortest Queue with Few Calls
You are given a list of queues of integers. For each queue, the only available operations are isEmpty() and poll(), where poll() removes and returns t...