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."
Design an ad frequency capping system
This question evaluates a candidate's ability to design scalable, low-latency distributed systems that enforce ad frequency caps across users, devices...
Design user communication functions
Design user communication functions In-Memory Communication Manager Context Build a simple in-memory component that tracks which users can communicate...
Design collaborative document editing backend
You are asked to design the backend for a real-time collaborative document editor similar to Google Docs. The interviewer is specifically interested i...
Design a Daily Puzzle Platform
This question evaluates backend system-design skills including API design, data modeling, service decomposition, scaling and consistency trade-offs, s...
Implement a leaky-bucket rate limiter
Implement a leaky-bucket rate limiter Implement a Leaky-Bucket Rate Limiter with Tests and Distributed Design Context and Assumptions - Implement in a...
Design a Netflix-like streaming platform
Design a Netflix-like streaming platform System Design: Netflix‑Like Video Streaming Platform Context Design a large-scale video streaming platform th...
Design Ticket Booking Auto Release
Design Ticket Booking Auto Release System Design: Auto-expiring Ticket Reservations Problem Design a ticket-booking system where a reserved ticket aut...
Design a Durable Key-Value Cache with File-System Persistence
Design and implement (at a discussion + light-code level — you will sketch the key functions but not run them) a durable in-memory key-value cache. Th...
Design a scalable notification system
Problem Design a notification system for a company at Airbnb-like scale that can send notifications to different user types (e.g., customers/guests, h...
Design a metrics collection and alerting system
Design a metrics collection and alerting system (like a simplified monitoring platform). Functional requirements: - Collect time-series metrics from m...
Design an Online Minesweeper Platform
This question evaluates competency in designing scalable, low-latency, real-time stateful systems, covering data modeling, API design, persistence, co...
Design Telehealth Consultation Queue
Design a web-based queuing application for a health-insurance company that offers free 24/7 telehealth access to its members through a website and mob...
Design a web search engine pipeline
Design the high-level pipeline of a web search engine. Assume you need to support internet-scale search (billions of web pages) with low-latency queri...
Design a cloud database write path and recovery
This question evaluates expertise in designing transactional write paths and crash recovery for cloud-native relational databases that separate comput...
Design a resource change tracking database
This question evaluates system design and distributed-systems competencies focused on change-data capture, event-driven architecture, correctness of d...
Design a Cross-Border Money Transfer Service
Design a cross-border money transfer service similar to a consumer remittance product. Users in one country should be able to send money to recipients...
Trace and reduce redundant curl requests
Instrument and Optimize a Client's HTTP Requests for a Workflow You are pair-programming with the interviewer. You have a client (a script or applicat...
Design a scalable consumer feature
System Design: Scalable, Privacy-Conscious Recommendations Service for a Consumer App Context You are designing a real-time recommendations service fo...
Design school-to-guardian messaging with acknowledgments
System Design: Guardian Acknowledgement Messaging Platform Context Design a system that enables school staff to send messages to students' guardians, ...
Design executable notebook service APIs
Design: Collaborative Notebook with Executable User Functions (JAR Upload) Context Design a collaborative, browser-based code notebook service. The sy...