Software Engineer System Design Interview Questions
Practice 1,011 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 banking with scheduled transfers and merges
Design banking with scheduled transfers and merges In-Memory Banking System with Scheduled Payments and Account Merges Design and implement a single-t...
Design a game leaderboard service
This question evaluates a candidate's ability to design scalable, low-latency ranking services, testing competencies in distributed systems, data mode...
Design a multi-tenant course purchase and delivery system
This question evaluates a candidate's skills in designing scalable multi-tenant architectures, covering data modeling for tenants, organizations, and ...
Design coding platform with global leaderboard
This question evaluates proficiency in scalable distributed systems and system design, including real-time ranking algorithms, data modeling, API desi...
Design a memory usage switcher with thresholds
System Design: In-Process Memory Usage Switcher Context You are designing an in-process memory guardrail for a backend service. The component monitors...
Design an extensible ticketing system
System Design: Extensible EventTicketSystem Context Design a ticketing platform that sells tickets for concerts, movies, and sports. The system must s...
Design in-memory threshold switcher
Design an In-Memory Memory-Pressure Switcher Context You are designing an in-memory component ("Switcher") that gates expensive work (e.g., request ad...
Design a Multi-Channel Message Queue
Design a Message Queue with Multi-Channel Messages and Channel-Based Subscriptions Context You are asked to design a message-queue data structure wher...
Explain OS and networking basics
Systems Fundamentals Quickfire (Onsite Software Engineer) Answer concisely but precisely. Use diagrams or bullets if it helps. 1) Processes, Threads, ...
Describe CAP, distributed systems, multithreading experience
CAP Theorem, Distributed Systems Design Decisions, and Multithreading Context Provide a structured answer that both explains the concepts and shows ho...
Design a REST GET API to fetch DB records
This question evaluates a candidate's competency in RESTful API design, HTTP semantics, database querying and schema considerations, pagination and fi...
Review an existing architecture for risks
This question evaluates an engineer's ability to perform an architecture review, identifying imminent scalability, reliability, operability, and secur...
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 a product notifications system
System Design: Push Notifications and In‑App Messaging Platform Context Design a notifications platform for a large consumer mobile app with millions ...
Design an online real-time chess game
Design a real-time online chess service with WebSockets, matchmaking, server-authoritative game state and clocks, durable event storage, reconnect, sh...
Design limited-time donation platform
Design limited-time donation platform System Design: Donations Platform for a Three-Day Global Fundraising Campaign Context You are to design an inter...
Design image upload end-to-end
Design image upload end-to-end System Design: End-to-End Image Upload Pipeline Context Design an end-to-end system that handles user picture uploads f...
Design Thread-Safe Tagging and Bookstore Systems
Design Thread-Safe Tagging and Bookstore Systems System Design and OO Design (Onsite) Part 1: Thread-Safe Document–Tag Design Design object-oriented c...
Design user communication manager APIs
Design user communication manager APIs In-Memory Communication Manager (Bidirectional Sessions) Goal Design a lightweight, in-memory manager that trac...
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...