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."
Debug Watch List Movie Operations
You are given a full-stack Movie DB application. Users can log in, create, update, and delete watch lists, and add or remove movies from a watch list....
Design a News Aggregation System (Google News-style)
Design a large-scale news aggregation service similar to Google News. The system continuously discovers and crawls news articles from tens of thousand...
Prepare for Backend Parsing, API Integration, AI Coding, and Bug Fixing Rounds
Prepare for backend parsing, extensible class design, API integration, AI-assisted coding, bug fixing, and a hiring-manager round. <details> <summary>...
Maintain Price Levels For A Single-Symbol Order Book
Implement a simplified NASDAQ market data book for one symbol. You receive callbacks when orders are inserted, modified, or canceled. Each order has a...
Design RAG Evaluation and Debugging
You own a production RAG-powered semantic search feature for a fintech product. Users enter natural-language questions; the system retrieves relevant ...
Find a User's Airport at a Given Time from Flight Records
Given flight records with departure airport, departure time, arrival airport, arrival time, and user id, implement a function that returns where a giv...
Design a Rule Evaluation Engine for Spending Policy Violations
Design a rule engine that determines whether a transaction violates spending policy rules, in an interview where AI may be used to draft implementatio...
Design the GPU Job Scheduler for a Text-to-Video Generation Service
Design the GPU Job Scheduler for a Text-to-Video Generation Service You are designing the backend that runs generation jobs for a large text-to-video ...
Design an In-Memory Transactional Key-Value Store
Design an in-memory key-value database that supports transactional reads and writes. Expose a class with these operations: - begin() starts a transact...
Design a Thread-Safe Buffered Writer with a Background Flush Thread
Design a Thread-Safe Buffered Writer with a Background Flush Thread Design a reusable in-process component — call it BufferedDiskWriter — that many ap...
Java, Spring & Kafka Fundamentals Deep-Dive
Java, Spring & Kafka Fundamentals Deep-Dive This is a rapid-fire fundamentals interview for a senior backend engineer working in the Java/Spring ecosy...
Implement A Prioritized Task Scheduler With Parent Dependencies
Implement a task scheduler. Each task has an id, due date, create time, high-priority flag, assignee, completion status, description, and optionally a...
Design an LLM Request Batching System
Design an LLM Request Batching System A model-inference service sits in front of a fleet of GPUs. Each individual user request carries one input strin...
Design a Centralized Logging System
Design a Centralized Logging System Design a system that collects application logs from a large fleet of microservice instances and makes them durable...
Design a prompt playground
Design a prompt playground for developers and prompt engineers. The product lets users write prompts, choose model settings, run prompts against AI mo...
Design a User Behavior Tracking (Clickstream Analytics) System
Design a user behavior tracking system for a web and mobile product. The system captures user interaction events, transports them reliably, processes ...
Build a Streaming Markdown Code Fence Parser
Implement a streaming Markdown parser that recognizes inline code spans marked with backticks and fenced code blocks marked with triple backticks. The...
Calculate Daily Survey Response Rates by Country
The interview report preserved the survey tables and the request to calculate response rate, but not the exact grouping or output contract. The follow...
Design a Distributed Rate Limiter
Design a Distributed Rate Limiter Design a rate limiter that enforces a per-client request quota (for example, "at most 100 requests per minute per AP...
Implement a Merkle Tree for Repository Contents
Implement a Merkle tree over the contents of a cloned repository. The tree should let a client and server compare repository state efficiently by exch...