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."
Transform sparse time-code stream to dense rows
Problem You are given: - A fixed set of M distinct codes (strings). The column order of the output matrix is the lexicographic order of these codes. -...
Plan a major database version upgrade
You have an application tier (API/web servers) talking to a primary database for writes and a secondary/replica database for reads. You need to perfor...
Describe a failure and a success
Questions 1. Tell me about a time you failed (or something didn’t go as planned). What happened, what did you learn, and what would you do differently...
Predict output when iterating ordered keys
Assume you have a data structure global_var[a][time] that behaves like an ordered map: - Keys (time) are kept in sorted ascending order. - order(map, ...
Design a High-Frequency Job Scheduler
Design a distributed job scheduler that supports one-time and recurring jobs, including high-frequency tasks that may run every few seconds. The syste...
Construct connected crop layout and safe paths
Problem A — Construct a garden with connected crop regions You are given an N × M rectangular grid (a garden) that must be fully planted using k crop ...
Design a multi-size storage locker system
Design a storage-locker system that supports storing and retrieving items when lockers come in multiple sizes. Scenario A company operates self-servic...
Solve Market-Risk and Probability Questions
Question Answer the following quantitative interview questions for a market-risk / data-scientist screen at Morgan Stanley. 1. Stress testing WTI and ...
Design a feed ranking system
Design a machine-learning-based feed ranking system for a consumer product. The system should rank candidate posts or items for a user's home feed in ...
Explain overfitting, underfitting, and regularization
You are asked ML fundamentals questions. 1. What are overfitting and underfitting? Describe how they show up in training vs. validation/test performan...
Build a fraud detection model
Design a machine learning approach for detecting fraudulent transactions or user actions. Discuss: - How to define the prediction target and labels - ...
Design a meeting scheduler and shopping cart
You are asked to do two system-design prompts. Prompt A: Meeting Scheduler Design a meeting scheduling system (similar to a calendar + scheduling assi...
Explain projects and handle AI-safety conflicts
Behavioral / Hiring Manager round 1. Walk through 1–2 key projects from your resume. - What was the goal and why did it matter? - What was your ...
Explain LLM training, RL, and evaluation
Explain how you would build and improve a modern large language model across the full lifecycle: pre-training, post-training, optimization, and evalua...
Decide Which Show to Renew
You are a data scientist at a streaming company deciding whether to renew or cancel content over a 2-year planning horizon. Assume the following: - Ea...
Design a pipeline orchestration system on Kubernetes
Design a pipeline/workflow orchestration system (similar to a DAG-based scheduler) that runs workloads on Kubernetes. Functional requirements - Users ...
Design a schema for server engagement
You are building analytics for a chat platform similar to Discord. The raw event sources are: - server(server_id, creator_id, created_at) - server_vie...
Protect SLA and Choose Storage
You own a service that calculates delivery-order payments from order lifecycle events. Discuss two design questions: 1. If an upstream dependency sudd...
Explain reliability and runtime fundamentals
You may be asked several short technical-fundamentals questions such as: - In a Kafka-based batch consumer, how would you prevent a batch from being p...
Calculate CTR and ad revenue
This interview included two SQL tasks. Task 1: Compare CTR during peak and non-peak hours You are given three tables: - ads(ad_id BIGINT, advertiser_i...