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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Construct connected crop layout and safe paths
Problem A — Construct a garden with connected crop regions You are given an N × M rectangular grid (a garden) that must be fully planted using k crop ...
Compute minimum rooms for time intervals
You are given a list of meeting time intervals, where each interval is represented as [start, end) (start time inclusive, end time exclusive) and star...
Add two big integers from digit lists
You are given two non-empty singly linked lists (or arrays) representing two non-negative integers. The digits are stored in reverse order, and each n...
Build and evaluate a full ML pipeline
You must predict both (1) probability that a user will spend >$0 in the next 7 days (classification) and (2) expected spend in the next 7 days (regres...
Infer distribution and choose robust statistics
A dataset of n=10,000 session revenues (USD) has: 65% zeros; mean=8.5; median=0; p90=30; p95=120; p99=620. (a) Propose a plausible generative model (e...
Implement longest subarray summing to k
Given an integer array nums (length ≤ 200,000; values may be negative) and integer k, return the maximum length and the [l, r] indices of a contiguous...
Design and critique an abuse-detection ML system
ML System Design: Abusive Content Detection and Triage (Trust & Safety) Context: You are designing an ML system to identify and triage abusive content...
Design viewing history and resume service
Design: Watched-Video and Resume Playback Service Context Design a backend service that records each user’s watched video list and lets them resume an...
Troubleshoot CPU, latency, and DNS issues
A) A Linux server’s CPU usage suddenly spikes. What immediate checks and commands would you run (e.g., top/htop, pidstat, perf, iostat), how would you...
Describe your proudest project
Behavioral prompt: Describe the project you are most proud of (Machine Learning Engineer) Provide a concise, technical, leadership-focused walkthrough...
Compute shortest paths with blocked nodes
Given a graph with nodes and edges and a designated source node s, compute the shortest distance from s to every other node. Some nodes are inaccessib...
Evaluate career paths under visa constraints
Career Decision Analysis After Layoff: 7 Paths, Decision Criteria, Matrix, Recommendation, and 90-Day Plans Context You are a laid-off software engine...
Design line-preserving file chunker pipeline
System Design: Pack Text Lines into Exact 100 MB Output Files Design a data pipeline that reads many text files of varying sizes and emits output file...
Design executable notebook service APIs
Design: Collaborative Notebook with Executable User Functions (JAR Upload) Context Design a collaborative, browser-based code notebook service. The sy...
Design a Twitter hashtag metrics aggregator
System Design: Hashtag Metrics Aggregator Design a service that ingests a high-volume stream of social posts (like tweets) and produces metrics/aggreg...
Answer collaboration, ambiguity, growth, and failure questions
Behavioral Interview Prompts Answer the following prompts using a structured format (e.g., STAR: Situation, Task, Action, Result). Assume the intervie...
Find right-side view of binary tree
You are given the root of a binary tree. From the right side of the tree, at each depth you can see exactly one node: the rightmost node at that depth...
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...
Simulate room assignments for scheduled meetings
Problem You are given n meeting rooms labeled 0..n-1 and a list of meetings meetings, where each meeting is [start, end] with start < end. Meetings ar...
Answer parity-alternation range queries
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 called alt...