Snapchat Software Engineer Interview Questions
Preparing for Snapchat Software Engineer interview questions means getting ready for a consumer-product, mobile-first evaluation that emphasizes clean, production-ready code, speed on algorithmic problems, and product-aware system design. Expect an initial recruiter conversation followed by a timed technical screen (live coding) and a final loop with multiple coding rounds plus a system-design session; behavioral fit is usually assessed throughout rather than in
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Check if a binary tree is complete
You are given the root of a binary tree. Determine whether the tree is a complete binary tree. A binary tree is complete if: - Every level, except pos...
Design a Story feature with offline support
Design a “Story” feature (similar to a social app’s stories) with the following capabilities: Core user features - Users can create a story (photo/vid...
Check whether an integer is a power of two
Given a signed 32-bit integer n, return true if n is an exact power of 2, otherwise return false. A power of 2 is a number of the form 2^k where k >= ...
Count ways to decode digit string
You are given a string s consisting of digits '0' to '9'. The string encodes a message using the following mapping: - '1' → A, '2' → B, ..., '26' → Z....
Compute longest increasing path in matrix
You are given an m x n grid (matrix) of integers grid, where m >= 1 and n >= 1. A path in the matrix is a sequence of cells where: - You may move from...
Design an Instagram Stories feature
Design a backend system for an Instagram Stories–like feature. Users can post short-lived stories (photos/videos) that are visible to followers and au...
Implement sin(x) with precision constraints
Coding Question: Implement sin(x) Implement a function that returns an approximation of the trigonometric sine function. Function signature - Input: a...
Design backend for Uber-like ride-hailing service
Design the backend system for a ride-hailing platform similar to Uber. Focus on: - How ride requests are placed and matched with drivers ("order takin...
Find max node-value range across components
Problem You are given an undirected graph with: - n: number of nodes (assume nodes are labeled 1..n) - from[]: list of edge start nodes - to[]: list o...
Implement a size-bounded LRU cache
Design and implement an LRU (Least Recently Used) cache where the cache capacity is measured by total size, not by item count. Each cached item has a ...
Implement a dictionary without built-in Dictionary
Implement a key-value map type (a “dictionary” / hash map) from scratch, without using the language’s built-in dictionary/map as the underlying storag...
How do you deliver when time is tight?
Scenario You are assigned a project with an aggressive deadline and limited time/resources. Question How would you ensure the project gets delivered o...
Explain Swift memory, value semantics, and GCD
Answer the following Swift/iOS fundamentals questions. A) GCD execution order + threads Assume the current thread is the main thread. Snippet 1 What i...
Implement LRU cache and prime products array
You are given two separate coding tasks. Task 1: Implement an LRU cache Implement an in-memory cache with a fixed capacity that evicts the least recen...
How do you decide with limited information?
Behavioral Question Describe a time you had to make an important decision with incomplete, ambiguous, or conflicting information. Include: - What deci...
Solve a two-jug measuring problem
You are given two jugs with capacities x and y liters and an unlimited water source. You may perform these operations: fill a jug, empty a jug, or pou...
Solve Open the Lock BFS
Question LeetCode 752. Open the Lock – Given an initial lock state "0000", a target combination, and a list of deadend combinations that cannot be use...
Design ride-hailing and price alert systems
During a system design interview, you are asked two related but separate questions: Part 1: Design a ride-hailing service (similar to Uber) Design the...
Implement XML tokenizer and parser with operations
You are given either (a) a raw XML-like string such as <catalog><book><author>Gambardella, Matthew</author></book></catalog> or (b) its tokenized form...
Design product co-occurrence analytics API
Design RESTful APIs for Co‑Purchase Analytics Context You are designing backend APIs to power a "related products" module based on co‑purchase behavio...