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."
Describe handling pressure and stakeholder conflicts
Behavioral/Scenario Questions for a Data Scientist — Technical Screen Answer concisely using STAR (Situation, Task, Action, Result) where relevant. 1....
Compare SQL counts, windows, and NULL semantics
You’re given two tables. users(id INT, country STRING, created_at DATE) rows: 1 | US | 2025-08-28 2 | US | 2025-08-30 3 | IN | 2025-08-29 4 | BR | 202...
Estimate billboard reach and impressions
Digital Billboard: Weekly Reach, Impressions, and Store-Visit Attribution Context You are estimating the performance of a single digital billboard bes...
Evaluate launching a vegan burger
Scenario You run a fast-food burger chain, and a rival has just launched a hit vegan burger. The question on the table: should you add a vegan burger ...
Compare Tableau blending, joins, and filters
Tableau Integration Exercise: Joins vs Blends, Filters, and Order of Operations Data You have two sources. Primary (Orders) - Columns: OrderID, State,...
Handle conflict, priorities, and harsh clients
Behavioral Case: Disagreement on Model Selection Under Deadline Context: You are a Data Scientist working with engineering, product, and an external c...
How would you evaluate emoji reactions launch?
You work on a Messenger-like chat app (not Meta). The product team plans to ship a new feature: Emoji Reactions (a user can long-press a message for 5...
How would you grow Meta products?
You are interviewing for a Product Growth Analyst role at Meta. For each of the following cases, explain how you would: (i) define the primary metric ...
Explain Transformer Encoder and Decoder Behavior
Answer the following Transformer fundamentals questions in a machine learning interview: 1. What are the main differences between a Transformer encode...
Design sequence decoding with greedy and beam search
Design sequence decoding with greedy and beam search Next-Token Decoding: Greedy and Beam Search Context You are given a probabilistic next-token dict...
Count Target-Sum Paths in an N-ary Tree
You are given the root of an N-ary tree. Each node contains an integer value and a list of zero or more child nodes. You are also given an integer tar...
Design a Test Orchestration System
Design a test orchestration service for an engineering organization. The service should let users define different kinds of tests, schedule when they ...
Solve Classic Probability Questions
An onsite interview included the following independent probability and expectation questions: 1. Squid Game bridge problem. In the classic glass-bridg...
Find possible robot positions
You are given a 2D grid where '.' represents an open cell and '#' represents a wall. A hidden robot is standing on one open cell. The robot's sensor r...
Design Detection Systems for Risk and Safety
The machine learning system design rounds focused on designing end-to-end production systems for several detection problems: 1. Bank fraud detection: ...
Design App Store search
Design the search system for a mobile app marketplace similar to an app store. Users enter short queries such as 'photo editor', 'budget tracker', or ...
Solve small string and API tasks
You are given three small programming tasks (typical “easy” difficulty). Implement each as a function. Task 1: Validate parentheses Given a string s c...
Design a high-level logging system
Design a high-level centralized logging system for a company. Assume many services (microservices, batch jobs) running across multiple hosts/container...
How would you measure App Store launch success?
Prompt You are a Data Scientist at an e-commerce platform (e.g., Shopify) launching a new App Store (a two-sided marketplace connecting merchants who ...
Design KV store with sliding-window QPS metrics
Problem Design an in-memory key–value store that supports basic operations and can report the average operation load over a recent time window. Functi...