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."
Implement a minimal local HTTP server
Build a Minimal Local HTTP/1.1 Server (No Frameworks) Context You are asked to implement a minimal HTTP/1.1 server from scratch using only the standar...
Design async batched key-value fetcher
Design an async, batched key-value fetcher with a 100 ms window Context You have a single-threaded, event-loop environment (e.g., JS/TS). A backend en...
Design a multi-size storage locker system
Design a storage-locker system that supports storing and retrieving items when lockers come in multiple sizes. Scenario A company operates self-servic...
Design a 3-day online donation system
System Design: 3-day donation campaign Design an online donation system for a 3-day fundraising campaign. Requirements - Users can donate money to a c...
Design a Netflix-like streaming platform
System Design: Netflix‑Like Video Streaming Platform Context Design a large-scale video streaming platform that supports web, mobile, and TV clients f...
Deep-dive a project architecture
Question Pick one of your recent, non-trivial projects and conduct a deep, end-to-end technical review. This is an open-ended architecture deep-dive: ...
Implement CIDR firewall matcher
Firewall Rule Matcher for IPv4 CIDR Rules Context and Assumptions You are to design and implement a firewall rule matcher that decides whether to acce...
Design restaurant shift scheduling
Design the backend for a restaurant workforce scheduling system. A company operates many restaurants. Each restaurant has employees and managers. Ever...
Design in-memory trade subscription processor
You are asked to design and implement the internal logic of an in-memory trade subscription processor in C++. A simplified interface is provided: `cpp...
Design a file sync and sharing service
Scenario Design a cloud file storage, sync, and sharing service similar to a consumer/team drive product. Core requirements - Upload/download files fr...
Design a Daily Puzzle Platform
Design a backend system for a daily puzzle platform. Users should be able to: - Sign in and view the puzzle of the day. - Submit an answer for the cur...
Design production-ready dedup service
System Design: Production-Ready File Deduplication Service Context Design a multi-tenant cloud service that stores files and achieves space savings vi...
Design a job scheduler
Design a Scalable Distributed Job Scheduler Context Design a multi-tenant, horizontally scalable job scheduler for backend services. The system must p...
Debug round-robin request router
Round-Robin Request Router with Health and Dynamic Membership You are given a list of backend servers and an incoming stream of requests. Implement a ...
Model data for an ads platform
Problem Design a data model for an online advertising system that supports creating ads and analyzing delivery/performance. Core product needs The sys...
Design a payment processing system
Scenario Design a backend payment system for an online product that supports: - One-time charges and refunds. - Idempotent payment APIs (clients may r...
Design low-latency large-scale hotel booking system
You are asked to design the backend for a large-scale hotel booking system that runs behind a very high-traffic consumer app (think a TikTok-like app ...
Design a URL Shortener
Design a URL shortening service similar to Bitly. The system should: - Accept a long URL and generate a short, unique alias. - Redirect users from the...
4.2 Design a Collaborative Document Editor
Real-time collaborative editing is one of those features that feels magical when it works — and absolutely nightmarish to build from scratch. Google D...
Design a TinyURL-like short link service
Design a TinyURL-like service that generates short URLs and redirects users to the original long URLs. Requirements: - Provide APIs to create a short ...