Snowflake Interview Questions
Practice the exact questions companies are asking right now.
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Implement topological sort and tree boundary traversal
You are given two separate coding tasks. Problem A — Order courses with prerequisites You have n courses labeled 0..n-1 and a list of prerequisite pai...
Implement an in-memory file system
Implement an in-memory file system supporting basic directory and file operations. You must support the following methods (names are illustrative; any...
Design an ACL authorization checking service
Design a centralized authorization (ACL) checking service used by other internal services to decide whether a principal can perform an action on a res...
Compute total time to finish all courses
Problem You are given n courses labeled 1..n. Each course i takes time[i] units of time to complete. You are also given prerequisite relations prereqs...
Solve four OA algorithm problems
You are given four independent coding questions. 1) Count square subgrids (multiple queries) For each query, you are given two integers R and C repres...
Design an object store with deduplication
System Design Prompt Design a simplified cloud object storage service (similar to an object store) that allows users to upload and download files. The...
Design transactional in-memory key-value store
Problem Design and implement an in-memory key–value store that supports basic operations plus transactions. Core API Implement the following operation...
Validate an extended tic-tac-toe state
Problem You are given a 3×3 tic-tac-toe board state as an array of 3 strings, each of length 3. Each cell is one of: - 'X' (player X) - 'O' (player O)...
Compute effective permissions on DAG and prune tree
Problem A — Effective allow/disallow letters on a DAG You are given a directed acyclic graph (DAG) with n nodes labeled 0..n-1. Each node u contains t...
Maximize revenue by choosing one query type
You are given a virtual warehouse that can execute queries. There are n query types, and you must choose exactly one query type to run repeatedly for ...
Check if each recipe is a contiguous subsequence
You are given: - An ordered ingredient list ingredients[0..n-1]. - A list of m recipes. Each recipe recipes[j] is itself a list of ingredients and is ...
Design a distributed tree node counter
Distributed Tree Node Count with Two Messages You are given an N-ary tree of machines (one process per node). Each node knows its parent (if any) and ...
Implement course scheduling and rate limiter analysis
You are given two independent coding problems. --- Problem 1: Course Scheduling You are planning to take a set of courses and are given prerequisite r...
Serialize and deserialize a dictionary trie
Design and implement serialization and deserialization for a trie that stores a large dictionary of words. Requirements: compact wire format; explicit...
Derive uniform RNGs from limited or biased sources
Sampling Construction and Analysis: From rand5() to rand7(), General randM()→randN(), and Fairness from a Biased Source You have access to a uniform p...
Check balanced parentheses with multiple bracket types
Given a string containing only parentheses '()', determine whether it is balanced. Follow-up: extend the solution to also support '[]' and '{}' with c...
Design a multi-tenant quota system
Design a Global Multi-Tenant Quota Service (Single Global Quota per User) Context Multiple upstream products (e.g., Drive, Photos) share a single glob...
Compute shortest path between two tree nodes
Given a binary tree (not necessarily a BST) and two node values u and v, implement a function that returns the shortest path between them as a list of...
Implement DFS with cycle detection and topo order
Implement DFS (recursive and iterative) with topo sort, cycle detection, and timestamps You are given a directed graph G with N nodes labeled 1..N and...
Design resilient auth with flaky third-party
System Design: Robust Token Acquisition and API Consumption Context You operate a main API that requires clients to present an access token issued by ...