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 Distributed Rate Limiter
Design a distributed rate limiting system for a large API platform. The platform runs many API gateways and backend services across multiple regions. ...
Design a prompt playground
Design a prompt playground for developers and prompt engineers. The product lets users write prompts, choose model settings, run prompts against AI mo...
Design a One-on-One Chat Service
Design a scalable one-on-one (1:1) chat service. The service lets registered users exchange private text messages in real time across web and mobile c...
Implement 1NN with NumPy
Implement a 1-nearest-neighbor (1NN) classifier from scratch using NumPy, then show that the same decision can be expressed as a neural-network-style ...
Debug Watch List Movie Operations
You are given a full-stack Movie DB application. Users can log in, create, update, and delete watch lists, and add or remove movies from a watch list....
Investigate Metric Drops and Coupon Retention
You are a Data Scientist for a ride-sharing marketplace operating in Toronto. This is a multi-part product-analytics case. Work through the three rela...
Design a Security Monitoring Framework
Design a security monitoring framework for a cloud infrastructure environment. The framework must continuously monitor hosts and workloads for suspici...
Design a Real-Time Top-K Ranking System
Design an object-oriented, real-time Top-K ranking system. The system continuously receives score updates for a large set of entities — for example us...
Design a Distributed Crossword Solver
Design a Distributed Crossword Solver Design a distributed system that solves crossword-like word puzzles at scale. You are given a rectangular grid o...
Design an Instagram-like Feed System
Design an Instagram-like photo-sharing application, focusing on feed generation and delivery. Your design should support: - Users creating posts conta...
Measure Bird Species Segregation
You are a data scientist analyzing bird observations from a forest. The ecology team wants to know whether different bird species are spatially segreg...
Validate AI-Generated Code Safely
Generative AI coding tools are now part of many teams' day-to-day workflow, and interviewers increasingly want to know not just whether you use them, ...
Design a Book Price Aggregator
Design a book purchasing marketplace where your service acts as an intermediary between customers and hundreds of partner bookstores. Your service hol...
Design Multi-Dimensional Request Rate Limiting
Design a rate limiter for a backend service that runs across multiple application servers. The system must decide, for every incoming request, whether...
Design a Shared Calendar Service
Design a Shared Calendar Service Design a shared calendar service similar to a modern online calendar product (think Google Calendar / a Notion-style ...
Design a Todo List Object Model
Design the object-oriented model for a todo list application. The product should allow a user to: - Create multiple todo lists or projects. - Create t...
Design ad frequency capping
Design an Ad Frequency Capping System Design a frequency capping system for an advertising platform. The system must ensure that a user does not see t...
Explain Core ML Interview Concepts
You are in a phone screen for an applied scientist role and are asked to verbally explain a set of machine learning fundamentals. For each part, give ...
Design Online Chess Matchmaking
Design the backend architecture for an online chess platform's matchmaking system. Players submit requests to play ranked or casual chess games. A req...
Design Asset Storage System
Design a high-level storage system for digital assets. The system must store and serve multiple asset types, including text documents, images, and vid...