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."
Explain overfitting vs underfitting and fixes
Question 1. What are overfitting and underfitting? 2. How can you diagnose each using training/validation metrics? 3. What are common mitigations for ...
Design a Location Recommendation System
Design a machine learning system that recommends places to a user in a maps or local-discovery product. A user opens the app and expects relevant near...
Design In-Memory QPS Counter
Implement an in-memory traffic counter. You need to support two operations for each logical key, such as an endpoint, customer, or service name: - rec...
Design an ads system to improve CTR
Design an ML system to increase the click-through rate (CTR) of ads shown in the personalized feed of an online social media platform. You run the ran...
Design a PKI for internal mTLS and certificates
System Design Prompt Design a Public Key Infrastructure (PKI) for an organization to issue and manage certificates used for: - Internal mTLS between s...
How do you resolve partner conflict?
Describe a time you worked with cross-functional partners such as Product, Engineering, Design, Marketing, or another business team on an important pr...
Design a pizza ordering system
Design the core object-oriented model for a pizza ordering system used by a small restaurant. The system should allow customers to: - browse a menu of...
Design a Ticketmaster-like ticketing system
System Design: Online ticketing platform (Ticketmaster-like) Design a system that sells tickets for events (concerts/sports) with seat selection. Core...
Define Ultra success and detect suspicious transactions
Assume the following relevant columns are available, and all timestamps are stored in UTC: - users(user_id BIGINT PRIMARY KEY, create_date TIMESTAMP, ...
Design chat and online chess
Design two large-scale consumer systems: 1. A workplace messaging platform similar to Slack. It should support organizations, channels, direct message...
Solve these string, subset, and date problems
You are asked to solve multiple coding tasks. 1) Reverse word order in a string - Input: a string s containing words separated by spaces (may contain ...
Solve maze reachability and two follow-ups
You are given three independent coding tasks. 1) Maze reachability with “rolling ball” movement Given an m x n grid maze where 0 means empty and 1 mea...
Design real-time exchange data sync system
Design real-time exchange data sync system System Design: Real-Time Multi-Exchange Stock Data Ingestion and Live Web Page Context You are asked to des...
Design a Marketing Email System
Design a marketing email system for a ticket marketplace. The business wants to run marketing campaigns that send 2 to 3 emails during a configured 15...
Handle multicollinearity in feature selection
You are building an interpretable predictive model for an insurance company, such as a linear or logistic regression model for claim risk. Several inp...
Design a video-on-demand streaming service
Scenario Design a large-scale video-on-demand (VOD) streaming service similar to a major streaming platform. Users should be able to: - Sign in and br...
Solve jump maximization and palindromic path queries
You are given two independent algorithmic problems. --- Problem 1 — Jump game with special destinations (maximize score) You are given an integer arra...
Design a shopping cart with coupons and tax
Design an object-oriented shopping cart module for an e-commerce system. Requirements: - A cart can add items and update item quantities. - The cart s...
Design an online auction system
Design a scalable online auction service. Users can: - Create an auction (item info, start/end time, reserve price optional). - Place bids while the a...
Minimum Character Changes to Make Every k-Length Block a Palindrome
Minimum Character Changes to Make Every k-Length Block a Palindrome You are given a password string and an integer k. The length of password is guaran...