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 backend to score and classify tweets
You are asked to build a small backend application that processes Twitter data and uses an external LLM-style API to score and classify each tweet. Re...
Design an ads event reporting system
Design an ads event reporting system that collects user-ad interaction events and serves aggregated metrics. Requirements 1. Ingest events from multip...
Explain bias–variance, overfitting, and vanishing gradients
Answer the following ML fundamentals questions: 1. Bias–variance tradeoff: What are bias and variance? How do they relate to underfitting/overfitting?...
Design authorization and audit logging systems
Scenario You are building security infrastructure for internal services at a fintech company. Two key components are needed: Part A — Internal authori...
Solve Grid Path and Unique Substring
You are given two independent coding problems. For each problem, provide an implementation and analyze the time and space complexity. Problem 1: Find ...
Implement BFS-based maze solver
Maze Printing and BFS Solver You are given a 2D grid representing a maze. Each cell of the grid is one of: - '#' – wall (cannot be passed) - '.' – emp...
Design real-time fraud detection under 50ms
Design a real-time fraud detection system for a payments company that processes millions of transactions per day. Requirements: - For each incoming tr...
Design Experiments Under Network Interference
You are a Senior Data Scientist for a gaming platform such as PlayStation. Answer the following experimentation questions. 1. A/A test validation: The...
Should WhatsApp launch group calls?
WhatsApp currently supports only one-to-one calling and is considering launching group calling for personal users. The product goal is to increase eng...
Design real-time ad impression and spend tracking
Scenario You are building a backend that helps an ad server decide whether a candidate ad can be delivered (e.g., not over budget / within pacing). Th...
Write self-attention and cross-entropy pseudocode
You are asked to explain core Transformer / deep learning components. Part A — Self-attention pseudocode Write clear pseudocode (not full code) for sc...
Parse code into operation triads IR
Problem: Operation-Triads Parsing (Mini Language) You are given a small, line-based programming language consisting of assignment statements and non-n...
Describe proudest project and toughest challenge
Behavioral questions 1. Proudest project: Tell me about the project you are most proud of. What was the goal, what did you personally own, and what wa...
Rank queries by prefix, frequency, and time
You are given three arrays of the same length n: - queries[i]: a non-empty string representing the text of the i-th query. - timestamps[i]: an integer...
Design a desktop AI chat frontend
Design a Frontend Architecture for a Cross-Platform Desktop Conversational AI App Context You are designing the frontend architecture for a cross-plat...
Compute posterior for biased coin after 3H1T
You are given a coin known to be biased: one face lands with probability 2/3 and the other with probability 1/3, but you do not know whether Heads is ...
Answer leadership and quality tradeoff questions
Answer the following behavioral questions with specific examples. 1. Describe a project you led. Why was it challenging? 2. Have you changed any hobbi...
Make tree iterators safe under concurrency
You have a binary tree and an inorder iterator implementation that maintains internal traversal state (e.g., a stack). Consider a multi-threaded progr...
Implement a Batch Image Processor
Implement a program that applies basic image transformations to a batch of images. You are given a list of input image paths and, for each image, a se...
Validate an IPv4 address string
Given a string s, determine whether it is a valid IPv4 address. A valid IPv4 address: - Has exactly 4 parts separated by dots (.): x1.x2.x3.x4 - Each ...