Software Engineer System Design Interview Questions
Practice 904 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 an online marketplace for buying and selling
System Design: Online Marketplace Backend Context Design the backend for a two-sided online marketplace where sellers list items and buyers purchase t...
Fix and harden an object pool
Refactor a Buggy C++ Object Pool Into a Correct, Thread-Safe Template Context You are given a buggy C++ object pool that suffers from races, double-fr...
Design Disk-Based Inventory Serving
Design software for a machine that has no SSD storage and only a small amount of RAM. The machine must service inventory requests using spinning disks...
Design autocomplete and merchant bulk edits
System Design Prompts 1) Design search engine input suggestions (autocomplete) Design a system that provides real-time query suggestions as a user typ...
Design a distributed cron job scheduler
System Design: Distributed Cron Job Scheduler Context You are designing a multi-tenant, internet-scale cron job scheduler that triggers tasks accordin...
Design a cross-region event processing platform
Scenario Design a cross-region event processing platform that ingests events from producers, stores them durably, and delivers them to multiple consum...
Optimize HTTP requests for speed and limits
You are building a service that needs to send HTTP requests to a large number of URLs (for example, a simple web crawler or data fetcher). The naive i...
Design a ride-sharing system (Uber)
Design a large-scale ride-sharing platform similar to Uber. Cover: - Rider and driver apps (account, availability, requesting rides). - Real-time driv...
Design a personal finance aggregator
System Design: Personal Finance Aggregation Platform (Mint-like) Context Design a consumer-facing platform that aggregates a user's financial data acr...
Design a prompt-sharing platform
The interviewer gives you a fixed high-level architecture: client -> web server -> database. Do not spend time redrawing the whole system. Design the ...
Design auth, session security, and top-N users
Web App Design: Authentication, Security, and Top-N Active Users Context: Build a browser-based web application where a user signs in and the page dis...
Design a key-value store
System Design: Scalable Key–Value Store with Range Scans You are asked to design a distributed key–value (KV) store that supports the following operat...
Design relational-to-NoSQL migration pipeline
System Design: Migrate From Relational DB to a NoSQL Key-Value Store with Snapshot + CDC Context You need to migrate data from an OLTP relational data...
Design file-processing API with long-running jobs
You are asked to design an HTTP-based API and high-level backend architecture for processing files in a cloud storage service (similar to a simplified...
Design a news feed aggregator
Design a Large-Scale News Aggregator and Personalized Feed Design a production-ready news aggregation and personalized feed platform — think a consume...
Compute top-N posts in a workspace
Design a feature that returns the top-N posts (e.g., Confluence pages/blog posts) in a workspace. Requirements: - Define what “top” means (e.g., views...
Design an access control system (RBAC + resource-based)
Design an authorization system that supports both: - Role-Based Access Control (RBAC): users/groups have roles (e.g., Admin, Editor, Viewer) that gran...
Design Real-Time Auctions for Social Posts
Design a real-time auction feature for a large social photo and video app. A creator can attach an auction to a post. Viewers can place bids, and ever...
Design a simple API rate limiter
Design a rate limiter for an API. Scenario You operate an HTTP API (e.g., /v1/*). You need to prevent abuse by limiting request rates. Requirements (c...
Design device telemetry pipeline for real-time and batch
Design a distributed system that ingests telemetry from millions of devices and supports both: - Real-time analytics (near-real-time dashboards/alerts...