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 article voting and flip-tracking system
Design an object-oriented "Article System" that supports voting and query operations. You need to design the data model and core APIs (including metho...
Use confusion matrix to choose model metric
Scenario You built a binary classifier (e.g., fraud detection, churn risk, medical screening, spam). You are given a confusion matrix on a validation ...
Design an image-to-multilanguage translator
Scenario Design a service that lets users upload an image containing text (e.g., a menu, screenshot, street sign), and returns the same image with the...
Design NL-to-Formula assistant for Airtable
Question Design an ML-powered assistant for a no-code table product like Airtable that converts a user's natural-language request into a formula expre...
Design an On-Demand Delivery Platform
Design an on-demand local delivery marketplace for restaurants or grocery stores. The platform should support customers browsing merchants, building s...
Describe an ML system you built
Describe a machine learning system that you previously designed, built, or owned. Cover the problem statement, business goal, data sources, feature en...
Solve sliding-window and disjoint-string-pairs tasks
Task A (Sliding Window) Given a string s, find the length of the longest contiguous substring that contains no repeated characters. - Input: a string ...
How do you manage performance and disagreements?
Manager behavioral prompts Answer the following as a people manager (or manager-level tech lead). Use real examples where possible. 1. Scope and owner...
Design an ads retrieval service using a heap
Object-Oriented Design: Ads Retrieval (Priority-Based) Design a component that manages ads and supports retrieving the “best” ads based on a score. Re...
Design a news feed ranking system
Design a personalized news feed recommendation system. Requirements: - Low latency serving (real-time feed generation). - Personalization using user b...
Write SQL for app metrics
You are given a simplified schema for a photo-sharing app: - users(user_id, user_name, joined_at) - photos(photo_id, user_id, created_at) - follows(fo...
Build AI-Assisted Full-Stack Transactions App
Build a minimal full-stack app for monetary transactions This is the "AI coding" round: using an AI coding tool of your choice (e.g., Cursor), build a...
Find largest group of two-digit numbers sharing digits
You are given an integer array A of length n (1 <= n <= 100). Each element is a two-digit number (e.g., from 10 to 99). Two numbers are considered con...
Compute Remaining GPUs With Switching Limits
Suppose you manage n GPU clusters with fixed daily capacities capacity[i]. Each day starts fresh with the full capacity, because all GPUs are returned...
Evaluate Last-Mile Product Metric Changes
You are a Principal Data Analyst supporting Walmart Last Mile delivery products. The customer journey includes browsing or cart entry, selecting deliv...
Detect sessions and gaps using SQL LEAD
Write a single ANSI-SQL query that (a) assigns per-user session_ids when the gap between consecutive events exceeds 30 minutes, (b) computes session_s...
How do you diagnose a ratio metric change
In an A/B test, the treatment group shows a statistically significant increase in a ratio metric: - CTR = clicks / impressions increased by +1.2% rela...
Compute Exclusive Execution Times
You are given n functions labeled from 0 to n - 1 and a chronological list of execution logs from a single-threaded CPU. Each log has the format: `tex...
How would you diagnose a completed orders drop?
Case: Completed orders dropped in Los Angeles You are a Data Scientist supporting a consumer pricing team for a two-sided delivery marketplace (custom...
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...