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...
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...
Solve Three Coding Problems
The interview included three coding problems: 1. Streaming top-k class. Design a class for an integer stream with a fixed parameter k. It should suppo...
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....
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...
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...
Explain median vs mean for L1/L2
Median vs. Mean Under L1 and L2 Loss, and the 2D Extension Explain, with intuition and a brief derivation, the relationship between the choice of loss...
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....
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...
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 ...
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...
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...
Compare WebSocket, SSE, and long polling
You are building real-time features for a web application and the interviewer probes your networking fundamentals across several layers of the stack. ...
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...
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...
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 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 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...
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...