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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Design a News Aggregator
Design a news aggregation system that collects articles from many external news sources and serves a unified feed to end users. A key constraint is th...
Find Maximum Island Perimeter
You are given an m x n binary grid where 1 represents land and 0 represents water. An island is a group of land cells connected vertically or horizont...
Implement a Leaky Bucket Limiter
Design and implement an in-memory leaky-bucket rate limiter. A limiter is configured with: - capacity: the maximum amount of queued load the bucket ca...
Implement a thread-safe rate limiter
Design and implement a per-user API rate limiter. Requirements: - Method: boolean allow(String userId, long nowMillis) returns whether the request is ...
Implement a Timestamped Counter
Implement a data structure that records calls to an increment method. Requirements: - Each call to increment(timestamp) receives an integer timestamp....
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...
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 ...
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...
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...
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...
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...
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...
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...
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...
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....
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...
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...
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...
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...