Snapchat Interview Questions
Practice 121 real interview questions from Snapchat. Covers Coding & Algorithms, System Design, Machine Learning, ML System Design. For roles including Software Engineer, Machine Learning Engineer, Data Scientist, Technical Program Manager.
"I got asked a hardcore MCM DP question and I saw it on PracHub as well. Solved that question in 5 minutes. Without PracHub I doubt I could solve it in 5 hours. Though somehow didn't get hired, perhaps I guess I solved it too fast? /s"
"Believe me i'm a student here jn US. Recently interviewed for MSFT. They asked me exact question from PracHub. I saw it the night before and ignored it cause why waste time on random sites. I legit wanna go back and redo this whole thing if I had chance. Not saying will work for everyone but there is certainly some merit to that website. And i'm gonna use it in future prep from now on like lc tagged"
"10 years of experience but never worked at a top company. PracHub's senior-level questions helped me break into FAANG at 35. Age is just a number."
"I was skeptical about the 'real questions' claim, so I put it to the test. I searched for the exact question I got grilled on at my last Meta onsite... and it was right there. Word for word."
"Got a Google recruiter call on Monday, interview on Friday. Crammed PracHub for 4 days. Passed every round. This platform is a miracle worker."
"I've used LC, Glassdoor, and random Discords. Nothing comes close to the accuracy here. The questions are actually current — that's what got me. Felt like I had a cheat sheet during the interview."
"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."
"Legit the only resource you need. TC went from 180k -> 350k. Just memorize the top 50 for your target company and you're golden."
"PracHub Premium for one month cost me the price of two coffees a week. It landed me a $280K+ starting offer."
"Literally just signed a $600k offer. I only had 2 weeks to prep, so I focused entirely on the company-tagged lists here. If you're targeting L5+, don't overthink it."
"Coaches and bootcamp prep courses cost around $200-300 but PracHub Premium is actually less than a Netflix subscription. And it landed me a $178K offer."
"I honestly don't know how you guys gather so many real interview questions. It's almost scary. I walked into my Amazon loop and recognized 3 out of 4 problems from your database."
"Discovered PracHub 10 days before my interview. By day 5, I stopped being nervous. By interview day, I was actually excited to show what I knew."
"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."
"The search is what sold me. I typed in a really niche DP problem I got asked last year and it actually came up, full breakdown and everything. These guys are clearly updating it constantly."
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...
Compute shortest path in a 2D grid
Given an m x n grid where: - 0 represents an empty cell you can move through - 1 represents a blocked cell you cannot enter - movement is allowed in 4...
Explain median vs mean for L1/L2
Median vs Mean Under L1 and L2, and the 2D Extension Task Explain, with intuition and a brief derivation, why: - In 1D, the median minimizes the sum o...
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 a short-video recommender for short-term interest
Scenario You are designing a short-video recommendation system (similar to a swipe/feed product). The system must personalize the feed for each user a...
Describe an innovation you drove end-to-end
Behavioral Question: Innovation Many teams value “innovation,” meaning you can generate and deliver novel, high-impact ideas. Prompt: - Tell me about ...
Compare WebSocket, SSE, and long polling
In the context of building real-time features for a web application, answer the following networking fundamentals questions: 1) WebSocket vs. Server-S...
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.,...
Find all quadruplets summing to target
Problem Given an integer array nums (length n) and an integer target, return all unique quadruplets [a,b,c,d] such that: - a + b + c + d == target - T...
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 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...
Design and analyze a banner A/B test
A/B Test Design: Home-Page Banner You are deciding whether to add a home-page banner in a consumer app. Design and analyze the A/B test end-to-end. As...
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...
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 CTR and metrics with pandas
Using pandas only, compute banner and story metrics. Assume today is 2025-09-01 and 'last 7 days' means 2025-08-26 to 2025-09-01 inclusive. You are gi...
Design a ranking system pipeline
Answer the following ML system design questions: - Describe the machine learning system you know best. Walk through the problem definition, data sourc...
Design Manhattan-distance meeting point finder
Given an m×n grid with cells marked 1 for homes and 0 otherwise, choose a single meeting cell that minimizes the sum of Manhattan distances from all h...
Find top co-purchased products
You receive purchase logs where each order is represented as an integer array of product IDs bought together in a single transaction. Implement a func...
Explain Random Forest randomness and implications
Random Forest — Rigor and Practical Choices Context: You are building a binary classifier with a Random Forest. The dataset has 100,000 rows, 100 feat...
Design a streaming ads system
System Design: Ad-Insertion Platform for Live and On-Demand Video Context You are designing an end-to-end ad-insertion platform for a consumer video s...