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 recommendation system end-to-end
Design a Recommendation System End-to-End You are asked to design a large-scale recommendation system that powers a personalized feed — for example, a...
Design a Merchant Ledger Service
Design a ledger service for a payments platform. The system must provide: - An API to record a transaction for a merchant. - An API to query the curre...
Scale a file-crawling API using async jobs
You implemented a synchronous API that lists all files under a directory (recursive crawl). Now you need to scale it. Part A — Scaling discussion (no ...
Solve two grid problems (islands + min-cost path)
You are given two separate coding questions. Problem A: Count distinct islands (translation-equivalent) Given an m x n binary grid grid (0 = water, 1 ...
Design a scalable search service with sharding
Technical Design: Search + Sharding Trade-offs Design a search service that lets users query documents/products with keywords. Functional requirements...
Design stock price time-series store and query
Problem Design a platform that stores stock prices over time and can be queried later. Core functionalities 1. Ingest price: The system receives event...
Print all odd numbers from an integer list
Problem Given a list/array of integers nums, print (or return) every odd number in the list, in the same order they appear. Clarifications / follow-up...
Implement an LRU cache
LRU Cache Design and implement a fixed-capacity Least Recently Used (LRU) cache. Operations - get(key) -> value | -1/null: Return the value if present...
Implement Streaming Clustering for Numbers
You receive a continuous stream of numeric values. Choose an appropriate clustering algorithm and implement it so that each incoming number can be ass...
Assign tasks to workers with types and accounts
You are implementing a task scheduler. There are W workers (IDs 0..W-1) and N tasks (IDs 0..N-1). Each task i arrives at time arrival[i] (non-decreasi...
Design a scalable coffee ordering notification system
Design an online coffee ordering system. Core flow - Customers browse menus for nearby coffee stores, place orders, and pay. - Coffee stores receive o...
Deep-dive a project and show ownership
You will be asked to do a deep dive on one or two past projects. The interviewer(s) may probe heavily on technical details and leadership behaviors. P...
Model y from x and interpret distributions
Scenario You are given a dataset with one input feature x and a target y. The interviewer asks: “How would you model this?” Later, you are shown a plo...
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...
How do you discuss mistakes and trade-offs?
Be prepared for both of the following prompts: 1. Tell me about a major mistake you made as a software engineer. Explain the situation, the impact,...
Design market price change notifications
Design a system that notifies users when market prices change for the symbols they track. Context and requirements: - Users maintain a watchlist of sy...
Explain Transformer Encoder and Decoder Behavior
Answer the following Transformer fundamentals questions in a machine learning interview: 1. What are the main differences between a Transformer encode...
Solve the N-Queens problem
Problem Given an integer n, place n queens on an n × n chessboard so that no two queens attack each other (i.e., no two queens share the same row, col...
Design CRUD APIs with async jobs
Scenario Design a small backend service that manages a core entity with CRUD operations and also supports an asynchronous background job triggered by ...
How would you define and use retention metrics?
Scenario You are a Data Scientist supporting a consumer product (app or website). A PM asks you to “dive deep” on user retention and recommends tracki...