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 large video upload for a YouTube-like app
System Design Prompt Design the video upload subsystem for a YouTube-like product that supports large video files. Core user flow 1. User selects a la...
Design a Synchronized Live Comment Overlay
Design a Synchronized Live Comment Overlay Design a chat-like comment service whose messages appear as a live overlay synchronized to a video or event...
Design real-time crypto prices homepage
This question evaluates system design competency for real-time, low-latency data pipelines and client fanout for a crypto prices homepage, testing ski...
Design a game leaderboard service
This question evaluates a candidate's ability to design scalable, low-latency backend systems and distributed data architectures, covering competencie...
Design a rate limiter
This question evaluates a candidate's competency in designing distributed rate limiting systems, covering rate-limiting algorithms, scalability and fa...
Design a Layover Activity Recommendation App
You are designing a mobile app for travelers who have free time during an airport layover. The app should recommend useful activities the traveler can...
Design a job scheduler with SLA and logs
This question evaluates understanding of distributed job scheduling, SLA enforcement, observability, and fault-tolerant execution across worker fleets...
Design aggregator for multiple downstream services
This question evaluates system-design and distributed-systems skills, focusing on microservice aggregation, fan-out/fan-in concurrency, fault toleranc...
Design a blob storage system for lunar environment
You are asked to design a blob storage system deployed on a lunar base. The interviewer is intentionally making the environment unusual (the Moon) to ...
Design a bidirectional data sync dashboard
This question evaluates distributed system design skills focused on reliable bidirectional data synchronization, conflict resolution, event ingestion,...
Design API for split-stay combinations
Question Design an HTTP API endpoint that, given a requested date range and a collection of Airbnb listings with their availability, returns all valid...
Build an API aggregator with concurrency and retries
Build an API aggregator with concurrency and retries Build an Aggregation Service with Parallel Calls, Timeouts, Retries, and Observability Context Yo...
Design A Low-Latency Product Price Update API
Design an API and serving system for product prices. Each product price is updated at most once every 24 hours, but the product launch page needs low-...
Design in-game payment wallet system
Design in-game payment wallet system System Design: In‑Game Currency Transfers and Analytics Context You are designing the in‑game currency subsystem ...
Design Multicloud Publishing and API Gateway
This question evaluates understanding of distributed systems and cloud architecture, covering reliable database-to-multicloud event publishing (messag...
Design Online Chess Matchmaking
This question evaluates a candidate's ability to design scalable, low-latency matchmaking backend systems, covering distributed service decomposition,...
Design a file search module like UNIX find
Design Task: Object-Oriented module that mimics UNIX find Context Design an object-oriented library that replicates the core functionality of the UNIX...
Design and explain your project architecture
Question Pick one of your recent projects and walk an interviewer through its architecture end-to-end. Sketch a high-level diagram, then go deep on th...
Design scalable worker pool for template jobs
You have implemented a function that takes a template string (or many template strings) and replaces placeholders like {{db_host}} and {{db_port}} usi...
Design a Real-Time Online Chess Platform
Design the backend for a globally distributed real-time chess platform supporting moves, spectators, clocks, reconnects, and failover. Define authorit...