Interview Questions
Practice the exact questions companies are asking right now.
"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."
Hierarchical Access Control for an Advertising Platform
Design an access-control system for an advertising platform. Advertisers are organized into a hierarchy of groups. A group may contain other groups (s...
Answer Amazon Leadership Principle Scenarios
In an Amazon Data Scientist intern virtual interview, answer behavioral questions using the STAR method and tie each story to Amazon Leadership Princi...
Design Real-Time Trending Likes
Design a real-time analytics service for a large social platform. The service receives like and unlike events for posts. It must support the following...
Design High-Throughput Messaging Infrastructure
Design the backend infrastructure for a service that ingests a high volume of events, durably stores them for later querying, and processes each event...
Implement Courier Delivery Cost Tracking
Design and implement a small in-memory cost-tracking service for food-delivery couriers. Each courier has a unique driverId and an hourlyRate. A deliv...
Count Referral Descendants
You are building a referral analytics feature. Each referral relationship is represented as a directed pair (referrer, referredUser), meaning referrer...
Design User Embedding Semantic Search
Design a user-embedding-based two-stage semantic retrieval and ranking system for a short-term rental marketplace. The goal is to retrieve and rank pr...
Describe Cross-Functional Remote Collaboration
Tell me about a project where you had to collaborate with cross-functional teams, such as non-engineering stakeholders, other engineering teams, or te...
Design a production file storage service
System Design: Production-Grade File Storage Service Problem Design a production-grade file storage service with the following APIs, semantics, and co...
Solve probability and stopping questions
Answer the following independent interview questions: 1. Let X and Y be independent random variables, each distributed Uniform(0,1). Find the probabil...
Explain multithreading vs multiprocessing
In the context of implementing a crawler, answer the following: 1. What is the difference between multithreading and multiprocessing? 2. How do these ...
Evaluate Arithmetic Expressions
Implement a function that evaluates a string arithmetic expression. Base problem: - The input is a string s containing non-negative integers, spaces, ...
Design delivery driver payment system
Design a delivery-driver payment system Design and implement an in-memory, object-oriented service that tracks delivery-driver work and computes payro...
Search Words in a Character Grid
You are given a 2D grid board of lowercase English letters with m rows and n columns. A word can be constructed from letters of sequentially adjacent ...
Design Slack-like chat system
Question Design the chat subsystem for an app like Slack/Discord. State your assumptions (scale, retention, consistency needs) and propose an end-to-e...
Design a Tic-Tac-Toe Engine
Implement an n x n Tic-Tac-Toe game engine for two players. Support a method move(row, col, player) that records a move and returns whether that move ...
Count Visits in One Minute
Design a system that can report the number of website visits in the most recent 1-minute sliding window. The website may receive high traffic, and the...
Design Search And Web Crawling Systems
You are asked to design two distinct large-scale systems in a single system-design interview loop: a Facebook-like search product and a distributed we...
Compare Complete and Partial Poker Hands
Implement a simplified poker-hand comparator. You are given two poker hands. A complete hand contains exactly 5 cards. Each card has a rank and, if ne...
Design a Read-Once Chat System
Design a chat messaging system where one sender can select multiple recipients at send time, but the message is not a group chat message. Instead, the...