Software Engineer System Design Interview Questions
Practice 1,093 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."
Fix and harden an object pool
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...
Design scalable rate limiter with token bucket
You are asked to design and implement a rate limiter for an HTTP API. Requirements - Limit each client (e.g., user ID or API key) to at most N request...
Build a Jenkins CI for graphics tests
Build a Jenkins CI for graphics tests Take‑Home: Design a Jenkins Pipeline for GPU Graphics Test Matrix Context You need to design a Jenkins-based CI/...
Design core bank operations
Design core bank operations Design a BankSystem Class (Take‑home Project) Goal Design and document a BankSystem class that supports three operations: ...
Design feedback and feature rollout platform
Design feedback and feature rollout platform System Design: Feedback + Feature Rollout Platform Context Build a multi-tenant platform that lets produc...
Design a mini banking system
Design a mini banking system In-Memory Banking System — Design and Implementation You are to design and implement an in-memory banking system that sup...
Design consistent hashing with a sorted map
Design consistent hashing with a sorted map Consistent Hashing with a Sorted Map (Virtual Nodes) Context You are building a client-side library to map...
Explain and diagram your past system architecture
Explain and diagram your past system architecture System Design Walkthrough: Architecture You Have Built/Owned Provide a whiteboard-style walkthrough ...
Design a scalable inventory system
Design a scalable inventory system System Design: Multi-Warehouse, Multi-Channel Inventory Service You are designing an inventory service for an e-com...
Design a fullstack app with frontend focus
Design a fullstack app with frontend focus Design a Full‑Stack Web Application (Frontend Emphasis) Context You are given a 2–3 page requirements docum...
Design an Accurate Click Aggregator
This question evaluates a candidate's ability to design reliable, high-throughput event processing and analytics systems, emphasizing data modeling, i...
Design an S3-like Object Store
This question evaluates system design and distributed storage architecture skills, focusing on scalability, durability, metadata versus data separatio...
Design keyword search for social posts
Design a Facebook-like post search feature: - Input: one or more keywords. - Output: all (or top-K) posts that contain the keyword(s). - Assume posts ...
Design a replicated key-value store with quorums
Design a distributed system that replicates key–value pairs across multiple replicas. The interviewer wants to focus on replication, quorums, and fail...
Design an hourly weather crawling service
Scenario Design a service that crawls the U.S. National Weather Service (or a similar public provider) and provides hourly weather data to internal co...
Design a Netflix-like video platform
Scenario Design a Netflix-like platform that supports: - Search for videos (by title, tags, people, etc.) - Stream videos to web/mobile/TV clients - U...
Design a Netflix-like video streaming service
This question evaluates competency in designing large-scale streaming platforms, focusing on distributed systems, content storage and encoding pipelin...
Design a Rate Limiter with Per-User Token Quotas
Design a Rate Limiter with Per-User Token Quotas Design a distributed rate limiter for a high-traffic API platform, with one twist that drives the who...
Design a URL shortening service
This question evaluates a candidate's ability to design scalable, highly available backend services, testing competencies in API design, data modeling...
Design an online coding platform
Design an online coding practice and interview platform (similar to well-known coding challenge sites). The platform should allow: - Users to sign up,...