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 scalable notification system
Problem Design a notification system for a company at Airbnb-like scale that can send notifications to different user types (e.g., customers/guests, h...
Design evaluation when A/B test is impossible
Scenario You want to evaluate whether a product or model change (e.g., a new ranking strategy, pricing rule, or UI change) improves business outcomes....
Solve Linked-List and Iterator Problems
You are asked to solve two coding problems. Problem 1: Detect shared nodes between possibly cyclic linked lists You are given the heads of two singly ...
Find Earliest Train Route
You are given a discrete train timetable and need to find a valid route through the train network. Each train has an itinerary represented as a sequen...
Insert parentheses to minimize expression value
You are given a string expression of the form A+B, where A and B are non-empty strings of digits (no digit is '0'). You must insert exactly one pair o...
Explain VPCs and private/public network connectivity
What is a VPC (Virtual Private Cloud)? Explain the difference between a private network and a public network/subnet. How do private subnets connect to...
Define a one-way function and its uses
What is a one-way function (also called a one-direction function) in cryptography? Define it precisely and explain common uses in real systems (e.g., ...
Answer senior-level behavioral interview questions
You are interviewing for a senior machine-learning engineer role on the tech-lead track at Meta, targeting roughly the IC6+ level. This is the first-r...
Design Harmful Content and OOM Detection
Design two machine learning systems: 1. Harmful content detection for LLM applications: Build a system that detects harmful user inputs or model outpu...
Choose the Best Travel Mode
You are given a 2D grid representing a map, a start cell, a destination cell, and several transportation modes. Each mode has a per-step time cost and...
Remove adjacent duplicates and handle tree input
You are asked three related coding questions. 1) Remove adjacent duplicates (repeatedly) Given a string s (lowercase English letters), repeatedly remo...
Generate all hyperparameter combinations
You are given several groups of hyperparameter choices for an ML experiment. Each group contains one hyperparameter name and a list of candidate value...
Find the First Unique Log
You are given a list of log entries in the order they were produced. Each log entry can be treated as a string. Return the first log entry that appear...
Build Premium User Propensity Model
Design an end-to-end modeling approach to identify free-tier users who are likely to convert to a premium subscription. Discuss: - the business object...
How would you present a project deep dive?
You are asked to do a project deep dive (often with a short slide deck). Present one project you worked on and be prepared for detailed follow-ups. Co...
Implement a Resizable Deque
Implement a double-ended queue (deque) data structure backed by a circular array. Your deque should support insertion and removal from both ends and s...
Maximize block fee with transaction selection
You are given N transactions. Each transaction has: - id (unique identifier) - size (positive integer) - fee (positive integer) You are building a blo...
Design in-memory DB with TTL and history
In-Memory Database: Progressive Design in 4 Levels You are designing a simplified in-memory database to be implemented in four progressive levels. Eac...
Design autocomplete with Trie
Design and implement an autocomplete service backed by a prefix tree (Trie). The service stores a dynamic dictionary of words, each carrying an intege...
Compute unique-dasher concurrency with tie-breaking
You are given N delivery assignments, each as (dasherId, startTime, endTime) with 0 <= startTime < endTime. A single dasher may hold multiple overlapp...