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."
Count Perfect Digit-Frequency Substrings
Count Perfect Digit-Frequency Substrings Problem Implement countPerfectSubstrings(s, k). The string s contains only decimal digits. A nonempty substri...
Design a Distributed Rate-Limiting Service
Design a Distributed Rate-Limiting Service Design a rate-limiting service that protects APIs across many application instances. It should support per-...
Design a Distributed Key-Value Store
This system design question evaluates the ability to architect a horizontally scalable distributed key-value store, covering data partitioning, replic...
Implement a Recoverable In-Memory Key-Value Store
Implement a Recoverable In-Memory Key-Value Store Design and implement a single-process key-value store whose working set is held in memory and whose ...
LLM Foundations: Architecture, Adaptation, and Steering
This question evaluates a candidate's conceptual understanding of large language model architecture, adaptation, and inference-time control. It probes...
Allocate IPO Shares and Split a Weighted Tree
Two Allocation and Tree Problems Implement both independent parts. Part A - IPO Share Allocation Each bid is [user_id, requested_shares, price, timest...
Design an LLM Inference Serving System
Design an LLM Inference Serving System Design a production system that serves inference requests for one or more large language models. Cover the requ...
Design a Read- and Write-Heavy Product Catalog Service
Design a Read- and Write-Heavy Product Catalog Service Design a service in which merchants create and update product listings while users browse and v...
Design a Concurrent, Memory-Bounded Tally Service
Design a Concurrent, Memory-Bounded Tally Service Design and implement the core of a TallyService with two operations: - bump(timestamp): record one e...
Design Tree Operations with DFS and BFS
Design an object-oriented tree class with several operations that require DFS and BFS traversal. Explain the node model, traversal APIs, and how you w...
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...
Compute entropy and implement 1-NN
You are given two short ML coding problems from a machine-learning engineer screen. Both are implementation-focused but probe whether you understand t...
Harden a URL-Caching HTTP Service for Production
Harden a URL-Caching HTTP Service for Production You inherit a working HTTP service that accepts URL-related requests and keeps cached URL records in ...
Design a Stateful Outreach Campaign Engine
Design an internal campaign engine that lets an agent select a custom subset of clients and start an outreach campaign for each selected client. For e...
Navigate Challenges, Conflict, and Mentorship on a Major Project
Navigate Challenges, Conflict, and Mentorship on a Major Project Choose one substantial project that you personally helped deliver. Use concrete examp...
Explain Why You Want This Company and Infrastructure Role
Explain Why You Want This Company and Infrastructure Role Explain why you want to join the company and why an infrastructure-focused software engineer...
Design and Implement a URL Shortening Service
Design and implement a URL shortening service in a combined whiteboarding and implementation interview where AI assistance may be allowed. `hint Hint ...
Evaluate a Live-Stream Group Notification Under Network Effects
Prompt A social travel app wants to add a notification: “Someone in one of your groups is live now.” The notification can increase attendance at live ...
Architect an AI Chatbot for Enterprise Users
Architect an AI chatbot for enterprise users over internal knowledge and tools. `hint Hint 1 Start by stating assumptions, then work from requirements...
Design a Streaming Job Scheduler
Design and incrementally build a streaming job scheduler: a service (and supporting class) that continuously ingests tasks and dispatches them to work...