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."
Count White Balls After K Steps
You are given a ring of N positions indexed from 0 to N-1. - At each position i, there is initially one ball whose color is either white or black. - E...
Spreading Contagion on a Grid
Spreading Contagion on a Grid You are given an m x n integer grid cells. Each entry has one of three values: - 0 — an empty location (no unit present)...
Minimum Cells to Bridge a Magic Grid
Minimum Cells to Bridge a Magic Grid You are given a magic grid runes with rows rows and cols columns. Each cell is one of three values: - 0 — an empt...
Design expense rules engine and return type
Design a Rules Engine for Corporate Card Expenses Context We offer a corporate credit card that employees use for business expenses. Managers set poli...
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...
Design an Ad Frequency Capping System
Design a frequency capping system for an advertising platform. A frequency cap limits how many times a user can be shown an ad, campaign, line item, o...
Measure Shopify App Store Success
You are a Data Scientist working on the Shopify App Store, a marketplace that connects Shopify merchants with third-party app developers. Merchants us...
Compare Two Coin Proportions
You are given results from two independent coin-toss experiments: - Coin A was tossed 100 times and landed heads 40 times. - Coin B was tossed 1,000 t...
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 Using AI at Work
Describe how you have used AI tools in your day-to-day work. In your answer, explain the business or engineering problem, how AI helped, what safeguar...
What are processes vs threads?
Question Explain the difference between multiprocessing and multithreading in the context of building concurrent applications. Cover the following: - ...
Implement topological sort and tree boundary traversal
You are given two separate coding tasks. Problem A — Order courses with prerequisites You have n courses labeled 0..n-1 and a list of prerequisite pai...
Compute effective permissions on DAG and prune tree
Problem A — Effective allow/disallow letters on a DAG You are given a directed acyclic graph (DAG) with n nodes labeled 0..n-1. Each node u contains t...
Implement lexicographically smallest Two Sum
You are given an unsorted integer array nums and an integer target. Return the indices [i, j] (0-based) such that i < j and nums[i] + nums[j] == targe...
Design a banking system with payments and merging
Design a banking system (progressive requirements) Design the backend for a simplified banking system that supports accounts, money movement, schedule...
Implement Multi-Head Attention from Scratch in NumPy
Implement multi-head scaled dot-product attention from scratch using only NumPy. This is the core building block of a Transformer block, and you must ...
Describe your most impactful project
Tell me about the project where you had the most impact. Explain the business or user problem, why it mattered, what your specific role was, the harde...
Design an app-store app recommendation system
You are building an app recommendation system for a mobile app store. Goal Recommend apps to a user on surfaces such as: - Home feed / “Recommended fo...
Design a concurrent web crawler
System Design: Concurrent Web Crawler (Threads) Design and implement a basic web crawler that fetches pages concurrently using a thread executor (e.g....
Compute Company Suggestion Funnels
An AI workflow suggestion product logs suggestion-related events in a single event table. Table: suggestion_events - event_id STRING: unique event rec...