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 a Durable Concurrent Event Writer
Design a Durable Concurrent Event Writer Design a thread-safe DataWriter used by one application process on one server: `text DataWriter(file_path) pu...
Design a Thread-Safe Buffered Writer with a Background Flush Thread
This question assesses a candidate's ability to design a concurrent, thread-safe component that decouples fast in-memory writes from slower disk I/O u...
Design an LLM Request Batching System
This question evaluates a candidate's ability to design a concurrent batching layer that groups individual requests into shared GPU inference calls un...
Design a News Aggregation Service
Design a News Aggregation Service Design a service that ingests articles from many news sources, normalizes and groups related coverage, and lets user...
Design a High-Demand Ticketing System
Design a High-Demand Ticketing System Design a ticketing system for high-demand events. Users should discover events, view seat or section availabilit...
Design a Reliable Job Scheduler
Design a general-purpose job scheduler. Clients submit jobs for execution at or after a requested time, inspect status, and cancel jobs that have not ...
Design an Amazon Locker Service
Design a Single-Station Package Locker Design the classes and core workflows for one self-service package-locker station. A delivery driver deposits a...
Design a Scalable Metrics Monitoring System
Design a Scalable Metrics Monitoring System Design a service that accepts application and infrastructure metrics, stores them over time, supports dash...
Design a Multi-Channel Notification System
Design a Multi-Channel Notification System Design a notification platform that accepts product events and delivers timely messages through channels su...
Design Versioned IDE Settings for Users and Teams
Design a service that stores IDE settings for both users and teams. A team can push settings to its members, while users may also have personal settin...
Find a Distributed Mode Efficiently
Find a Distributed Mode Efficiently A large multiset is partitioned across ten workers. Find the value with the highest total frequency across all wor...
Design a Resilient Chat System
Design a Resilient Chat System Design a chat system and trace data end to end through its components. Support direct and group conversations, message ...
Design and Scale Quantitative Optimization Workflows
You are discussing two quantitative systems: a tax-loss harvesting optimizer and a multi-period asset-location backtest. Explain the mathematical mode...
Design Permission-Aware Retrieval for Design Files
Design Permission-Aware Retrieval for Design Files Design a search system for a design-editing agent. Users and agents issue short queries, typically ...
Design a Highly Available Conversational AI Service
Design a Highly Available Conversational AI Service Design a conversational AI service that accepts a user message and streams a generated response. B...
Design Cloud Photo Storage and Multi-Device Sync
Design a cloud photo-storage service with upload, download, and multi-device synchronization. Store photo bytes separately from searchable metadata. S...
Design Food Reviews, Votes, and Reviewer Rewards
Design Food Reviews, Votes, and Reviewer Rewards Design a service where users can rate a food item, post a written review, and upvote or downvote anot...
Design a User Behavior Tracking (Clickstream Analytics) System
This question asks for the design of an end-to-end user behavior tracking (clickstream analytics) system, covering event collection, transport, proces...
Design a Geolocation Search Service
Design a geolocation search service that returns relevant places or entities near a user. `hint Hint 1 Start by stating assumptions, then work from re...
Design a Snapshot-Driven Product Catalog
Design a Snapshot-Driven Product Catalog Design a product catalog system with four capabilities: 1. A retailer periodically supplies a complete snapsh...