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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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...
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...
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 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...
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 ...
Determine Whether a Word Transformation Exists
Given a beginWord, an endWord, and a list of valid words wordList, determine whether it is possible to transform beginWord into endWord. Rules: - Each...
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...
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 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...
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...
Solve Three Algorithmic Tasks
You were asked three coding problems: 1. Count events inside a time window - You are given an initial collection of event timestamps in HH:MM:SS fo...
Design a Column-Queryable KV Database
Design a distributed key-value database for sparse records, where each row has a primary key and a flexible set of named columns. The system must supp...
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...
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 recent-use eviction cache
Design a fixed-capacity key-value cache that removes the least recently accessed item when it becomes full. Implement a class with the following opera...
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...
Compute minimum escape time in a grid
You are given a 2D floor plan grid. Each cell is one of: - . empty space (walkable) - # wall/blocked (not walkable) - P a person - E an exit A person ...
Describe improving workflow and challenges
Behavioral: Improving a Team's Development Workflow You are a software engineer in a technical screen. Answer using a concise, structured story (e.g.,...
Parallelize the lock BFS safely
Parallelize the lock BFS safely Parallelizing BFS for the Rotating-Lock Problem Context You are given the classic rotating-lock problem (e.g., a 4-whe...
Design ride-hailing and price alert systems
During a system design interview, you are asked two related but separate design questions. Treat each as an independent end-to-end design; you will be...