Snowflake Coding & Algorithms Interview Questions
Snowflake Coding & Algorithms interview questions typically blend standard LeetCode-style algorithmic problems with data-focused scenarios that reflect the company’s cloud data-warehouse and query-processing domain. Interviewers evaluate algorithmic problem solving, correctness, time/space complexity reasoning, clean and testable code, and the ability to connect solutions to real-world data problems (for example, efficient streaming, batching, or SQL-adjacent logic). Expect an initial online assessment or phone screen with 1–2 coding problems, followed by deeper technical interviews or an onsite loop that may include live coding in a shared editor, SQL puzzles, and system-design conversations for senior roles. For interview preparation, focus on solidifying core data structures (arrays, strings, trees, graphs, heaps, hash maps), common algorithm patterns (two pointers, sliding window, DFS/BFS, dynamic programming), and complexity analysis, while practicing clear, concise communication of trade-offs. Pair algorithm practice with at least a basic review of Snowflake’s product areas—query performance, distributed compute, and data modeling—so you can frame solutions with practical performance considerations. Time-box practice, do mock interviews, and rehearse explaining your thought process and trade-offs under pressure.
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Compute task order and layered execution
You have N tasks labeled 0..N-1 and prerequisite pairs (a, b) meaning task a must complete before task b can start. Return any valid execution order o...
Compute task order with prerequisites
Given an integer n representing tasks labeled 0..n-1 and a list of prerequisite pairs (a, b) meaning b must be completed before a, return any valid or...
Solve three coding rounds
You are given three independent interview-style coding tasks. 1) Nearest cake/person in a 2D grid You are given an m x n grid of integers: - 1 = cake ...
Solve build ordering and expression evaluation
Part A — Dependency ordering: You are given an integer n (0 ≤ n ≤ 200000) representing tasks labeled 0..n-1 and a list of prerequisite pairs [a, b] me...
Serialize and deserialize a dictionary trie
Question Design and implement serialization and deserialization for a trie (prefix tree) that stores a large dictionary of lowercase English words. Th...
Schedule prerequisite classes with retakes
Problem You are building a course-taking engine. Each course is represented as an object: - id (unique identifier) - prevCoursesList: a list of prereq...
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...
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...
Solve and optimize 3Sum and variants at scale
Implement a function that returns all unique triplets (i, j, k) of indices whose values sum to a target T, with strong performance and deduplication g...
Implement crawler and bracket validator
Implement two tasks: ( 1) Write a function crawl(start_urls, fetch, max_depth, domain_filter) that visits pages starting from the given seed URLs usin...
Find longest substring with at most k distinct
Given a string s and an integer k, return the length of the longest contiguous substring that contains at most k distinct characters. Provide an O(n) ...
Design an in-memory filesystem and circular queue
Part A — Design an in-memory hierarchical file system. Requirements: - Support operations: ls(path), mkdir(path), createFile(path, content), appendToF...
Minimize coins with overpay and change
You have an unlimited number of coins with denominations: - 1, 5, 10, 50, 100, 200 You need to pay exactly n units to another person. You are allowed ...
Transform tree with subtree sum mapping
Transform tree with subtree sum mapping You are given the roots of two complete binary trees T1 and T2 that have identical structure (same shape and n...
Find longest unique-character substring
Given a string s, return the length of the longest substring without repeating characters. Explain and implement an O(n) sliding-window solution using...
Evaluate arithmetic expression with variables
Implement an expression evaluator for a string expr containing non-negative integers, variables (alphabetic names), operators +, -, , /, parentheses '...
Transform tree using counterpart subtree sums
Given the roots of two complete binary trees with identical structure, modify the node values of the second tree so that each node equals the sum of a...
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...
Find first error and propagate failures
You are given a chronological log history where each entry is a string prefixed with one of [Info], [Warn], or [Error]. Two invariants hold: ( 1) once...
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 ...