Software Engineer System Design Interview Questions
Practice 893 real System Design interview questions for Software Engineer roles. From companies including Meta, OpenAI, Amazon, Anthropic, Google.
"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 log-query stream processor
Stream Processor: Query Registration and Log Tagging Context You are designing a streaming component that ingests a single mixed stream of messages. E...
Design Event Email System
Question Design an event system that can manage at least 1,000,000 concurrent events and send notification emails to every registered participant of e...
Design a high-level logging system
Design a high-level centralized logging system for a company. Assume many services (microservices, batch jobs) running across multiple hosts/container...
Identify and handle race conditions
Concurrency in an In-Memory Key-Value Store and Hit Counter Context and Assumptions Assume you are implementing an in-memory key-value store and a hit...
Design a ChatGPT-like serving system
Design a ChatGPT-like system for inference serving. Your design discussion should cover: 1. High-level architecture for chat completion (request routi...
Design Distributed Cloud Job Scheduling
Design a distributed cloud job scheduling system. Users submit jobs that require resources such as CPU count, memory, GPU type, GPU count, region, and...
Design an in-memory hotel booking system
Design a hotel booking system that supports reservations without using any database. You may only use in-memory data structures. Requirements Define A...
Design CRUD APIs with async jobs
Scenario Design a small backend service that manages a core entity with CRUD operations and also supports an asynchronous background job triggered by ...
Design a local activity counter service
System Design: Near-Real-Time Activity Counting Service Context Build a service that ingests high-throughput client events and provides near-real-time...
Design an ad frequency capping system
Design a frequency capping system for an ads platform. An ad server must decide, for each ad impression opportunity, whether showing an ad would viola...
Design a hotel search and booking system
Assume you are asked to design a hotel search and booking service that runs inside a larger platform (similar to an online travel agency). Requirement...
Design a YouTube/Netflix video platform
Design a video platform similar to YouTube/Netflix. Requirements: - Upload videos (for YouTube-like) and/or ingest catalog (for Netflix-like). - Trans...
Design real-time live comments
Design a real-time comment system for live video (e.g., Facebook Live comments). Requirements: - Viewers post comments; all viewers see new comments q...
Design a rare-book lending and returns system
System Design: Rare Books Circulation Across Multiple Branches Context Design a system to manage borrowing and returning rare books across multiple li...
Design an in-memory database
System Design: In-Memory Database Engine (Single-Node Core, Scale-Out Aware) Context Design the core of an in-memory, single-node database engine inte...
Design a highly reliable account balance system
Scenario You are designing a backend service that stores and updates user account balances (like a wallet/bank ledger). The system must be highly reli...
Design a parking lot system
Design a parking lot system (software + core components) that supports multiple entry/exit gates, different spot types, ticketing, and payment. Functi...
Design real-time driver heatmap system
System Design: Real-Time Driver Heatmap and Top-K Hottest Cells Context You are building a real-time driver heatmap for a ride-hailing platform that v...
Design a multi-device calendar application
System design prompt Design a calendar application similar to Apple Calendar. Core features - Users can create, update, and delete events. - The UI mu...
Design a near-real-time weather API
Question Design a weather data platform that retrieves best-effort hourly dumps from an external Weather Service API for approximately 2,000 locations...