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."
Maximize Throughput and Count Trigger Components
You are given two independent coding problems. Problem 1: Maximize Pipeline Throughput A production pipeline has n services connected in series. Servi...
Design Duplicate File Detection
Design a system to find duplicate files. Start with a single-machine version: given a large directory tree, identify groups of files that have identic...
Design a Photo Album App
Design a web-based photo album application for the browser (a frontend-focused system design). The product has three main screens, each provided to yo...
Design a scalable logging system
Design a centralized logging system for a large organization — an internal observability platform (think a self-hosted Splunk / Datadog Logs / ELK) th...
Compare Complete and Partial Poker Hands
Implement a simplified poker-hand comparator. You are given two poker hands. A complete hand contains exactly 5 cards. Each card has a rank and, if ne...
Describe Leading a Technical Project
In a hiring manager behavioral interview, use a real past engineering project to answer the following questions: 1. What project did you lead, and why...
Design GenAI Fine-Tuning and Agent Tradeoffs
You are interviewing for a software engineering role involving generative AI infrastructure and quantitative applications. The interviewer wants to un...
Design a Scalable News Feed
Design a large-scale social news feed service. Users can: - create posts, - follow and unfollow other users, - open the app to see a personalized home...
Design an Instagram-Style Social Feed
Question Design an Instagram-style photo and video sharing service with a personalized home feed (similar to Instagram). Functional requirements: 1. U...
Design a ChatGPT Playground
Design a web-based AI playground — a prompt-testing console similar to the OpenAI / ChatGPT Playground. A signed-in user types a prompt, picks a model...
Search Words in a Character Grid
You are given a 2D grid board of lowercase English letters with m rows and n columns. A word can be constructed from letters of sequentially adjacent ...
Expand Nested Repetition Expressions
Implement a function that expands a valid encoded string containing nested parenthesized repetition expressions. Rules: - Ordinary characters are appe...
Explain batch inference design
You need to generate predictions for a very large offline dataset, such as all users or all products, once per day using an already trained machine le...
Design ledger and bikemap integration
System Design: Strongly Consistent Ledger + External Service Integration Design two loosely related components for a production-grade environment, and...
Implement a Snapshot Set Iterator
Design and implement a set data structure that supports snapshot iteration. The set stores unique values. It must support the following operations: - ...
Explain OOP design and API rollout
In one interview round, the discussion focused on practical backend engineering rather than pure algorithms. Discuss both of the following: 1. You are...
Design an Agentic Ticket Support System
Design an AI-powered ticket support system. The system must integrate with two existing external systems: 1. Ticket system: Displays all support ticke...
Implement a Database Connection Pool
Implement a simple database connection pool. You are given a mock database client with a function such as db.query(connection, sql) or an equivalent s...
Answer common project leadership questions
Prepare concise, structured answers for a behavioral interview covering these themes: - A project you are most proud of - Feedback you received and ho...
Implement a random fixed-size load balancer
Problem: Build a simple load balancer Implement a minimal in-memory load balancer that routes each incoming request to one backend node chosen uniform...