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."
Build a Custom CompletableFuture: Async Primitive and Parallel Array Processing
You are asked to design and implement, from scratch, a simplified asynchronous "future / promise" abstraction in the spirit of Java's CompletableFutur...
Design a Double Descent Experiment
You are given a take-home assignment for a mechanistic interpretability / machine learning interview. Design an experiment that clearly demonstrates s...
Infection Spread Simulation with Death Threshold
You are given an m x n grid that simulates the spread of an infection over discrete days. Each cell holds one of four states: - 0 — uninfected (health...
Design a Streaming Job Scheduler
Design and incrementally build a streaming job scheduler: a service (and supporting class) that continuously ingests tasks and dispatches them to work...
Design an Online Coding Judge Platform
Design an Online Coding Judge Platform Design an online coding-practice and judging platform (similar to LeetCode or Codeforces). Users should be able...
Diagnose Declining Email Click-Through Rate
An e-commerce marketplace sends marketing emails to its sellers to encourage actions such as listing more products, joining campaigns, or using promot...
Design a Slack-Like Messaging System
Design a Slack-like team messaging system focused on sending and receiving messages in real time. Your design should support workspaces with channels ...
Evaluate Noisy Data for LLM Post-Training
You are an ML engineer working on post-training a large language model. You are handed a large, noisy dataset assembled from multiple heterogeneous so...
Design a sandboxed cloud IDE
System Design: Sandboxed Cloud IDE (Colab-like) Design a multi-tenant, browser-based cloud IDE/notebook that lets users run code inside an isolated sa...
Build Churn Prediction and Survival Models
Problem Statement You are a Data Scientist working on retention. Describe, end to end, how you would build models to predict and understand customer c...
Design a Cron Job Scheduler
Design a distributed cron job scheduler — a service that triggers user-defined jobs on recurring, cron-style schedules. Assume worker (execution) capa...
Design a "Future Best-Sellers" Prediction and Recommendation System
Design a "Future Best-Sellers" Prediction and Recommendation System An e-commerce platform wants a new feature on its category pages. A user selects a...
Behavioral Round: Judgment, Prioritization, and Influence
Behavioral Round: Judgment, Prioritization, and Influence This was the behavioral interview. You will be asked three questions about judgment, reprior...
Vertical Order Traversal of a Binary Tree
Vertical Order Traversal of a Binary Tree You are given the root of a binary tree. Return the vertical order traversal of its nodes' values — that is,...
Discuss Complex Systems and Failure Examples
Behavioral Interview: Complex Systems, Failure, and Deliberate Growth You are interviewing for a Software Engineer role on a Google Cloud team (securi...
Design a RAG-Based Agent System
Design a Retrieval-Augmented Generation (RAG) system that backs an LLM-based agent. You should be able to reason about the full lifecycle — from inges...
Design a Secure PDF Data Room
Design a virtual data room product that lets companies organize and securely share confidential PDF documents with other organizations. The product sh...
Debug a GRPO training loop and explain ratios
You are given a simplified implementation of a GRPO (Group Relative Policy Optimization) training step for an RLHF-style policy model. The training is...
Compute Matrix Prefix Products And Gradients
You are given $N$ square matrices $A[0], A[1], \dots, A[N-1]$, each of shape $D \times D$. Define the inclusive prefix (cumulative) products: $$Y[i] =...
Implement Review Content Moderation
You are given an existing backend service for online reviews (Node.js/Express-style, with a persistence layer where a User model exposes await user.sa...