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 Online Bookstore
This question evaluates a candidate's ability to design a scalable, fault-tolerant online bookstore by addressing service decomposition, functional re...
Design a Read-Once Chat System
Design a chat messaging system where one sender can select multiple recipients at send time, but the message is not a group chat message. Instead, the...
Design Scalable Expense Violation Processing
This question evaluates a candidate's competency in large-scale system design, distributed stateful processing, rule-engine architecture, efficient ru...
Design a REST API Abstraction Layer
Design a REST API Abstraction Layer (Internal Service-Client SDK) A company runs many application servers that call internal REST services. Today, eve...
Design an Online Coding Judge Platform
This question evaluates a candidate's competencies in large-scale system design, secure multi-tenant execution and sandboxing, capacity planning, queu...
Design a Perishable-Goods Inventory and Location Tracking System
This system design question evaluates the ability to architect a location-tracking and inventory service for perishable goods across a distributed ret...
Optimize Object-Backed APIs and Design an LLM Observability Platform
Optimize Object-Backed APIs and Design an LLM Observability Platform First, improve POST and GET endpoints that currently read a large JSON object fro...
Design an Ad Assignment API
Design an HTTP API that exposes an ad-assignment function as a production service. The underlying function is given a user, a list of browser position...
Design a Slack-Like Messaging Platform
This question evaluates a candidate's competency in designing scalable, low-latency distributed messaging architectures, covering conversation modelin...
Design Container Assignment with Incompatible Goods
Design Container Assignment with Incompatible Goods Design a service that assigns goods in a shipment to ocean containers while respecting capacity an...
Design a Scalable Job Scheduler
Design an internal job scheduling platform for a large company. The platform lets internal services and engineers submit jobs that run at a specified ...
Design a Cloud DevBox Platform
Design a cloud DevBox platform: a service that gives developers disposable or persistent remote development machines, accessible through a browser, SS...
Design Messaging With Message Deletion
Design a real-time messaging application with channels or conversations, message history, and message deletion. Focus especially on how deletion behav...
Design a scalable logging system
Design a centralized logging system for a large organization — an internal observability platform (think a self-hosted Splunk / Datadog Logs / ELK) th...
Design an E-Commerce Shopping Website
This question evaluates a candidate's ability to design scalable, distributed backend systems for high-traffic e-commerce workloads. It tests practica...
Design an ad frequency capping system
Design a real-time ad frequency capping system for an ads platform. When the ad server is deciding whether to show an ad to a user, it must enforce ca...
Design an Ad Pacing System
Design an advertising pacing system for a large-scale video / streaming advertising platform. Advertisers create campaigns with budgets, flight dates ...
Design an in-memory order matching engine
You are asked to design an in-memory order book / order matching system for a single electronic trading venue. The implementation language is C++, and...
Design an RSS News Feed Service
Design an RSS news feed service. The service lets users subscribe to RSS sources, ingests articles from those sources on a schedule, stores article me...
Review a Web Application Architecture
You are given a high-level architecture diagram for a web application: Client/Web App -> DNS -> Load Balancer -> Application Service -> Database The a...