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."
Design a Real-Time Sensor Intelligence System
Design an end-to-end real-time sensor intelligence system for a product team. Start from ambiguous product requirements and cover the full lifecycle: ...
Design a Hotel Booking System
Design the backend for an online hotel booking platform. The system should let users: - search for hotels by location, dates, and number of guests - v...
Solve Balanced Permutations and Tree Reversals
You have 90 minutes to solve the following two independent coding problems. Problem 1: Balanced Prefix Values in a Permutation You are given a permuta...
Design a Photo Management Service
Design a photo management system where users can upload photos, view them later, and organize them into albums. The system should support creating alb...
Implement Byte Formatting and Cafeteria Billing
You need to solve two independent programming tasks. Task 1: Format a byte count Given an integer bytes representing a size in bytes, return a formatt...
Implement a RESTful Q&A service
You are asked to build a small REST service (in any language/framework you choose) that resembles a minimal Stack Overflow-style Q&A system. Design an...
Measure scheduled posts feature success
Facebook is considering launching a new feature that allows users to schedule a post to be published at a future time. The product hypothesis is that ...
Simulate an exchange and participation-rate trading
Implement a simplified trading simulation in three parts. Part 1 — Process market data / exchange interaction (order book) Design a minimal limit-orde...
How would you test product changes?
You are interviewing for a Product Data Scientist role at a food-delivery marketplace. Answer the following related experimentation cases: 1. Checkout...
Debug Transformer and Add KV Cache
You are given a small decoder-only transformer (GPT-style) implemented in PyTorch for autoregressive (next-token) language modeling. The starter code ...
Explain Overfitting and Transformer Attention
You are interviewing for a machine learning engineering role. Answer the following ML fundamentals questions clearly and compare different modeling se...
Debug transformer and train classifier
Debug and Fix a Transformer Text Classifier, Then Train and Evaluate It You inherit a small codebase for a transformer-based text classifier. It ships...
Design streaming error-log counting with moving average
Design a core component in a streaming system: Input: - Multiple upstream services continuously emit log events. - Each event includes at least: servi...
Minimize Branch Merge Conflicts
You are given several feature branches that must all be merged into the main branch. Each branch contains a sequence of commits, and each commit modif...
Design follow/follower classes
Object-Oriented Design: Follow / Follower Relationship Design a small set of classes for a social product where users can follow and unfollow each oth...
Design a payment system with holds and batching
Scenario Design a payment system that supports: 1. Hold payment (authorization): Place a temporary hold on a customer’s payment method for a given amo...
Design Rolling-Window Ad Frequency Capping
Design a frequency-capping service for an advertising platform. The ad platform receives ad requests for users and must decide whether a candidate ad,...
Design a Ride-Hailing Matching System
Design a ride-hailing matching system similar to a taxi or rideshare application (e.g. Uber, Lyft, DiDi). The interview focuses on the driver-location...
Design Personalized Promotion Recommendations
Design an offline personalized recommendation system for promotional products. The system should periodically generate ranked product or offer recomme...
Maximize Boxes Stored Through One Entrance
You are given two integer arrays: - boxes[i]: the height of the i-th box. - rooms[j]: the height limit of the j-th room in a linear warehouse. The war...