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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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) ...
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...
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...
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 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...
Set second tree values by subtree sums
Given the roots of two complete binary trees T1 and T2 that have identical structure and the same number of nodes, replace each value in T2 with the s...
Evaluate arithmetic expression with variables
Implement an expression evaluator for a string expr containing non-negative integers, variables (alphabetic names), operators +, -, , /, parentheses '...
Filter hierarchical paths after deletions
Given two arrays: ( 1) paths — slash-delimited hierarchical strings such as "California", "California/San Francisco", "California/San Francisco/7th St...
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...
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...
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 ...
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...
Serialize and deserialize a dictionary trie
Design data structures and algorithms to serialize and deserialize a dictionary trie storing lowercase English words. Specify a compact wire format th...
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...
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...
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...
Schedule dependent services with layered startup
You are given N services and dependency pairs (u -> v) meaning u must start before v. 1) Produce a valid startup order if one exists; otherwise detect...
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 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...
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 number of nodes). Modify T2 so that, for ...