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 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...
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...
Implement command-driven in-memory key-value database
Implement a command-driven in-memory key–value database. Supported commands (one per line): 1) SET key value 2) GET key → print value or NULL 3) DELET...
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...
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...
Debug a Machine Learning Pipeline
Debugging a Sudden Accuracy Drop in a Deployed ML Pipeline Context You are on-call for a production machine learning service. Monitoring alerts show t...
Implement a Fixed-Capacity Deque
Design and implement a fixed-capacity double-ended queue. The data structure is initialized with an integer capacity k and must support the following ...
Design a Real-Time Auction Platform
Design a real-time online auction platform. Users can browse an auction, submit bids, and see the current highest bid and bid history update live. Tra...
Generate Account Email Notifications
You are building an email notification scheduler for user accounts. You are given: 1. A list of user accounts. Each account has: - account_id - ...
Design Features for Residual Volatility
You have historical intraday data for a universe of equities. Design features and a modeling approach to predict a target stock's volatility over the ...
Delete a Character From Cover
You are given a source string book and a cipher represented by a list of inclusive index intervals cover = [(l1, r1), ..., (lm, rm)]. The decoded ciph...
Fill rooms with nearest-gate distance
You are given an m×n grid representing a building floor plan: - -1 = wall/blocked cell - 0 = gate - A large positive number (e.g., INF = 2^31-1) = emp...
Explain thermal and signal fundamentals
Answer the following hardware fundamentals questions for a wearable sensor product: 1. Model a heat-transfer path as an equivalent thermal-resistance ...
Design Data Quality and Observability Pipeline
Design a production data orchestration, data quality, and observability framework for batch and streaming data pipelines. Your design should address: ...
Determine Safe Bomb Defusal
You are given a finite state machine representing a bomb defusal process. - Each state is represented by a string. - initialState is the starting stat...
Find the Most Frequent Log Call
You are given a sequence of application log entries. Each entry contains the name of a function or API call made by the system. Write a function that ...
Design Catalog Update Pipeline
Design a system that takes a very large product catalog, for example 500 million records, and propagates updates to all downstream internal systems. E...
How to host many domains on one IP?
You have a single Linux server with one public IPv4 address. A coffee shop, butcher shop, and auto repair shop each want their own website and their o...
How would you investigate a metric decline?
Scenario You are a Data Scientist supporting a consumer marketplace product. A key business metric (e.g., orders/day, conversion rate, revenue, profit...
Debug a Project Assignment Codebase
You are given a multi-file codebase and several CSV fixtures that implement a project assignment workflow. The system assigns people to projects based...