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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Implement a custom list with iterator and map
You are asked to implement a simple generic list type without using any built-in collection classes (e.g., no ArrayList, LinkedList, Vector, etc.). Yo...
Design a device owner lookup service
Scenario Your server receives a stream of events from clients. Each event contains: - user_id - device_id - timestamp (event time) A device may be ass...
Design real-time ad impression and spend tracking
Scenario You are building a backend that helps an ad server decide whether a candidate ad can be delivered (e.g., not over budget / within pacing). Th...
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 a search autocomplete suggestion service
Design an autocomplete component that suggests the most relevant search phrases as a user types. You are given historical sentences with their usage c...
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...
Find minimum-latency path across dependent services
You are given a set of services and directed dependencies between them. Each dependency edge represents a call from one service to another with a know...
Maximize correct guesses in a hat line puzzle
Problem (Hat Guessing Strategy) There are N people standing in a line. Each person wears a hat that is either Red or Blue. - Person i can see the hats...
Design a swipeable video feed backend
Design the backend service for a short-video product similar to a “Spotlight”-style feed. Scope: only the backend “feed vending” functionality that po...
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...
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 >= ...
Design short URL service with click counting
Design a production-ready service that: 1. Creates a short URL for a given long URL (URL shortening). 2. Redirects when a user visits the short URL. 3...
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....
Design a metrics collection and alerting system
Design a metrics collection and alerting system (like a simplified monitoring platform). Functional requirements: - Collect time-series metrics from m...
Implement an iOS scrollable grid with navigation
You are building a small iOS prototype in Xcode (Swift). You may use SwiftUI or UIKit. Implement a scrollable square grid of cells. Incrementally add ...
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...
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...
Determine escape path with blockers and spreading fire
You are given a 2D grid representing a grassland. - Each cell is one of: - S: start - T: target - .: free cell - #: blocked cell (cannot enter...
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 ...