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 Text-to-Video Generation Platform (Sora-style)
Design a Text-to-Video Generation Platform (Sora-style) You are asked to design the backend platform that powers a text-to-video generation product. A...
Design experiments for payments, search, and promotions
You are a Data Scientist supporting a consumer marketplace app (users search restaurants and place orders). Answer the following product experimentati...
Implement a Database Connection Pool
Implement a simple database connection pool. You are given a mock database client with a function such as db.query(connection, sql) or an equivalent s...
Troubleshoot a production server outage
You are the on-call engineer responsible for a production server for the next several days. Discuss how you would approach the following: - How would ...
Implement a Snapshot Set Iterator
Design and implement a set data structure that supports snapshot iteration. The set stores unique values. It must support the following operations: - ...
Describe Leading a Technical Project
In a hiring manager behavioral interview, use a real past engineering project to answer the following questions: 1. What project did you lead, and why...
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...
Answer common project leadership questions
Prepare concise, structured answers for a behavioral interview covering these themes: - A project you are most proud of - Feedback you received and ho...
Solve Flower Placement and Directory Deletion
You will solve two independent coding tasks. Task 1: Place Flowers on a Grid Given an N x N grid: - 'H' represents a house. - '0' represents an empty ...
Expand Nested Repetition Expressions
Implement a function that expands a valid encoded string containing nested parenthesized repetition expressions. Rules: - Ordinary characters are appe...
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 an Agentic Ticket Support System
Design an AI-powered ticket support system. The system must integrate with two existing external systems: 1. Ticket system: Displays all support ticke...
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...
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...
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...
Driving a Project Forward Despite Internal Opposition
Driving a Project Forward Despite Internal Opposition Walk me through the most significant project you've worked on. Tell me what it was, what your ro...
Explain XGBoost's Overfitting Resistance
A single, unpruned decision tree can recursively partition the training set until its leaves describe individual training points, which makes it a hig...
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...
Calculate Driver Payments
Build a payout calculator for a delivery platform. You are given: - A list of delivery records. Each record has delivery_id, driver_id, start_time, en...
Explain batch inference design
You need to generate predictions for a very large offline dataset, such as all users or all products, once per day using an already trained machine le...