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 how you use AI tools in development
You’re asked about your AI experience in day-to-day software development: - What AI-assisted development tools have you used (e.g., code completion, c...
Compute board-game score from regions
You are given a 2D board for a board game. Each cell is encoded like G1 or W0: - The first character is the terrain/area type (e.g., G, W, S). - The d...
Design hit counter for last 5 minutes
You are launching a new webpage and need a last-minute server-side metric to track popularity in real time. Implement a hit counter that supports the ...
Maximize revenue by choosing one query type
You are given a virtual warehouse that can execute queries. There are n query types, and you must choose exactly one query type to run repeatedly for ...
Design a frontend shopping cart and feature flags
Scenario You are designing frontend-focused systems for a large e-commerce web app. Part A — Shopping cart (frontend focus) Design the shopping cart e...
Compute and plot a precision–recall curve
You are given model outputs for a binary classifier: - y_true: an array of 0/1 ground-truth labels of length n. - y_score: an array of predicted score...
Design low-latency large-scale hotel booking system
You are asked to design the backend for a large-scale hotel booking system that runs behind a very high-traffic consumer app (think a TikTok-like app ...
Describe Conflict and Impact
Prepare strong answers for the following behavioral and project deep-dive questions for a data scientist role: 1. Tell me about a time you went beyond...
Design a baseline loan recommendation system
System Design: Baseline Loan Recommendation System Context Design a baseline system that recommends loan offers to users on a digital platform. The sy...
Walk through a recent project design
System Design: End-to-End Project Walkthrough Provide a structured walkthrough of a recent project you led end-to-end. Organize your answer using the ...
Design a distributed web crawler
System Design: Distributed Web Crawler (1,000 Heterogeneous Workers) Context You are asked to design a production-grade web crawler that begins from a...
Decide target via subsequence plus/multiply expression
Question Given a sequence of positive 32-bit integers A and an integer target, determine whether there exists a subsequence of A (preserving order, us...
Design a game recommendation modeling approach
Scenario You are building a personalized game recommender for a consumer app/store. The goal is to recommend a ranked list of games to each user to in...
Design an At-Most-Once Job Scheduler
Design a distributed job scheduler that supports both one-time and recurring jobs. Requirements: - Clients can create jobs with a schedule, payload, r...
Design a Real-Time Logging System
Design a logging/telemetry system for a large application platform. Requirements: - Many services send log or metric events to the system - Event subm...
Design ads frequency capping service
Design an Ads Frequency Capping Service Context You are designing a service that ensures a user does not see the same ad creative or campaign more tha...
Answer HR screening questions for data role
** HR HR 1. 2. 3. 4. 5. 6. 7. 8. 30 HR **
Compute reply-based user metrics in 7 days
You are analyzing discussions on a social platform. Tables all_post - post_id (BIGINT, PK) - post_author_id (BIGINT, FK → user.user_id) - post_creatio...
Explain Vision Encoders and LLM Bottlenecks
Answer the following machine learning system fundamentals questions: 1. What is a vision encoder, and what role does it play in a computer vision or m...
Implement a versioned recipe management system
You are asked to implement an in-memory Recipe Management System (similar in difficulty to a simple banking/in-memory DB exercise). The system support...