Software Engineer System Design Interview Questions
Practice 1,082 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 Alert Notification Service for Downstream Consumers
Design an Alert Notification Service for Downstream Consumers Design an alert-notification system whose recipients are downstream services rather than...
Design a News Aggregation System (Google News-style)
Design a large-scale news aggregation service similar to Google News. The system continuously discovers and crawls news articles from tens of thousand...
Design a Concurrent Image Processing Service
Design a Concurrent Image Processing Service Design an image-processing service in two stages. First, support one processor safely. Then scale to mult...
Design Comment Notifications with Viral-Pin Aggregation
Design Comment Notifications with Viral-Pin Aggregation Design a system that sends a push notification to a pin owner when someone comments on the pin...
Design a Payment Lifecycle from Hold to Charge and Settlement
Design a Payment Lifecycle from Hold to Charge and Settlement Design a payment system whose main lifecycle is hold, charge, then settlement. A hold re...
Design a Distributed Frequency-Capping Service
Design a frequency-capping service for an advertising platform. Before an ad impression is served, the caller asks whether a user has already seen a c...
Design an Embeddable Pay by Bank Widget
Design an Embeddable Pay by Bank Widget Design a Pay by Bank widget that online businesses can embed in checkout or bill-payment pages. The widget's i...
Design a Large-Scale Streaming AI Product Feature
Design a Large-Scale Streaming AI Product Feature Design a product-facing AI feature for many concurrent users with streamed responses. Cover API and ...
Design Chat Deletion Semantics Under Concurrent Sends
Design Chat Deletion Semantics Under Concurrent Sends Design the backend of a chat application that supports creating threads, sending messages, readi...
Design a Hotel Search and Reservation System
Design a Hotel Search and Reservation System Design a hotel system with APIs, database schema, and query paths for property discovery, date-range avai...
Design a Low-Latency Metrics and Alerting Platform
Design a Low-Latency Metrics and Alerting Platform Design a multi-tenant platform that collects host and application metrics, stores time-series data,...
Design a High-Throughput Payment Authorization and Settlement System
Design a payment system that handles about 10,000 transaction requests per second. Each transaction first goes to an external payment service for appr...
Design a Music Playlist Service
Design a Music Playlist Service Design a service where users create playlists, add or remove tracks, reorder items, and retrieve a playlist in playbac...
Design Online Chess Matchmaking and Clocks
Design the backend for online chess games with skill-based matchmaking and authoritative countdown clocks. Players enter a queue for a selected time c...
Design a Billing-Token Rate Limiter for AI Agents
Design a Billing-Token Rate Limiter for AI Agents Design a rate limiter that controls the number of billing tokens consumed by AI-agent requests. Requ...
Design the GPU Job Scheduler for a Text-to-Video Generation Service
This system design question evaluates a candidate's ability to design a resource-scheduling layer for scarce, expensive compute under sustained overlo...
Design a Multi-Channel Notification System
Design a Multi-Channel Notification System Design a system that accepts notification requests and delivers them through configured channels such as in...
Design Chat APIs, Storage, and Core Message Flows
Design Chat APIs, Storage, and Core Message Flows Design the API and database model for a chat service. Cover direct and group conversations, sending ...
Design a Distributed Token-Bucket Rate Limiter
Design a distributed rate limiter using token buckets. Each user or API key has a bucket with a fixed capacity. Tokens refill at a configured rate, an...
Design a Real-Time Like Counter for Collaborative Tasks
Design a Real-Time Like Counter for Collaborative Tasks Design the backend and client-update flow for a collaborative task product in which signed-in ...