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 a global real-time notification system
Problem Design a global, real-time notification system that can deliver messages via: - Mobile/Web push - Email - SMS The system supports 100M+ users ...
Design REST APIs for JSON file storage
Scenario Design a service that stores JSON files/documents and exposes a RESTful API for clients. Requirements - Clients can upload, download, list, a...
Design a file upload and scanning report system
Design a system that lets users upload files, scans them, and produces a final report. Core workflow 1. User uploads a file. 2. System runs one or mor...
Design a food delivery system
Design a food delivery platform (similar to common restaurant delivery apps). Core user stories 1. Customers can browse restaurants/menus, place an or...
Design an online auction system
Design a scalable online auction service. Users can: - Create an auction (item info, start/end time, reserve price optional). - Place bids while the a...
Design scalable worker pool for template jobs
You have implemented a function that takes a template string (or many template strings) and replaces placeholders like {{db_host}} and {{db_port}} usi...
Design in-memory delivery billing core APIs
You are asked to design an in-memory billing service for a food-delivery platform. The focus is on data structures and API behavior; you may ignore pe...
4.1 Design a Live Streaming Platform
This is a classic system design question that tests your ability to handle real-time data at massive scale. Live streaming sits at the intersection of...
Design 64-bit distributed IDs and a parking lot
You have two system-design prompts. 1) 64-bit database ID generator Design a service/library that generates globally unique 64-bit integer IDs for dat...
Design KV store with sliding-window QPS metrics
Problem Design an in-memory key–value store that supports basic operations and can report the average operation load over a recent time window. Functi...
Design ads frequency capping service
Design an Ads Frequency Capping Service Context You are designing a service that ensures a user does not see the same ad creative or campaign more tha...
Design a 911 emergency calling service
System Design Prompt Design a 911 emergency calling service (or emergency call routing platform) that allows users to place emergency calls from mobil...
Design a satellite propagation simulator
Object-Oriented SatelliteNetwork: Message Propagation Simulator Design and implement an object-oriented SatelliteNetwork that processes a stream of in...
Design sliding-window rate limiter with multi-keys
Design a Precise Sliding-Window Rate Limiter Context You are designing a rate limiter for an API that must enforce a true sliding-window limit (i.e., ...
Implement a leaky-bucket rate limiter
Implement a Leaky-Bucket Rate Limiter with Tests and Distributed Design Context and Assumptions - Implement in a general-purpose language; the referen...
Design a scalable resume search system
System Design: Resume Search Platform Context A recruiting company needs a platform where applicants can upload resumes and recruiters can search, fil...
Design a fair event registration queue API
Scenario Design an in-memory service (OOD-style) to manage registrations for an event where fairness means users are served strictly in the order they...
Design a user behavior monitoring system
System Design: User Behavior Monitoring System You are asked to design a monitoring/analytics system that collects user behavior events from clients (...
Design a Data Stream Processor
Design a real-time data stream processing system for application events. Each incoming event contains fields such as event_id, creator_id, event_type,...
Enable secure offline reservation caching
System Design: Offline Caching for Reservations (PWA) Design a web application that supports offline access to reservation information. The app is a p...