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."
In-Memory File System: Create, Track Duplicates, and List
In-Memory File System: Create, Track Duplicates, and List Implement an in-memory file system that supports creating files and folders and listing the ...
Present a Project With Correctness Guarantees
Prepare a 1-2 slide presentation about a system or product you personally built, owned, or significantly improved. In the interview, walk through: - t...
Design an API for pay computation with retries
You’ve implemented logic that computes a dasher’s pay from order event logs (events include timestamps and state transitions). Design an HTTP API to e...
Design a GPU-aware pod scheduler
Design a GPU-aware pod scheduler GPU-Aware Pod Scheduler and Cluster Manager (OO Design) Context You are designing a simplified, object-oriented clust...
Implement Event Filtering and Queue Routing
An upstream event pipeline continuously emits events as JSON strings. You need to implement an in-memory routing service that decides which downstream...
Implement common data-structure and JS tasks
You are given several independent coding tasks that appeared across an OA and frontend-focused interviews. Implement each as specified. 1) Time-based ...
Design a news aggregator like Google News
Scenario Design a News Aggregator Service similar to Google News. The system aggregates articles from many publishers and shows users: - Top Stories (...
Design real-time per-status device counts
Scenario You have 1,000,000 devices. Every minute, each device sends a message containing: - device_id - timestamp - status (one of 10 possible status...
Design a Connect-Four-like board game
Design an object-oriented model for a turn-based, grid-based “drop token” board game similar to Connect Four. Game rules (define these precisely in yo...
Design a Scalable Job Scheduler
Design a job scheduler for a small startup, then explain how you would evolve it to support roughly 100x more scheduled tasks. The system should: - Al...
Design Apple News without ML
Design an initial search and content-discovery system for a news application similar to Apple News, assuming you do not have a trained ranking model y...
Explain core probability and ML statistics concepts
Answer the following short theory questions (you may use equations and brief examples): Probability 1. You roll two fair six-sided dice. - What is ...
Design favorites and social game recommendations
Problem Design a backend system for a gaming app that supports: 1. Favorites ("Fav"): users can favorite/unfavorite games and view their favorites lis...
Design a Figma-like collaborative editor
System Design: Collaborative design editor (Figma/Google Docs style) Design the backend (and key client interactions) for a real-time collaborative de...
Design a Cross-Border Money Transfer Service
Design a cross-border money transfer service similar to a consumer remittance product. Users in one country should be able to send money to recipients...
Implement a Resizable Deque
Implement a double-ended queue (deque) data structure backed by a circular array. Your deque should support insertion and removal from both ends and s...
Design Travel Page Data APIs
A travel advisory company is launching a customer-facing product experience for browsing and requesting travel services. You are given mockups for thr...
Define Ultra success metrics and detect suspicious transactions
You work on a fintech product with these existing tables (UTC timestamps). You may only use these tables/columns; if a metric cannot be measured direc...
Design in-memory DB with TTL and history
In-Memory Database: Progressive Design in 4 Levels You are designing a simplified in-memory database to be implemented in four progressive levels. Eac...
Design delayed job scheduler (LLD)
Design a Delayed Job Scheduler (Low-Level Design) Design a service that schedules a job to execute X seconds in the future with second-level accuracy....