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 scenario-based speaking feature
System Design: Scenario-Based Speaking Practice for a Multilingual Learning App Goal Design a scenario-based speaking practice feature where users sel...
Design signals across power and clock domains
Question In a SoC with two power domains A and B, design the interface for a control signal signal_1 (a registered 1-bit control such as an enable/sta...
Design an Instagram Stories feature
This question evaluates backend system design competencies including distributed systems, scalability, data modeling, API design, media storage/transc...
Diagnose failures via SSH and large logs
Diagnose failures via SSH and large logs Troubleshooting Large Logs Over SSH and Designing Centralized Logging Context You are on-call for a productio...
Design lexicographic range query word store
Design a storage/data structure for a set of strings that supports lexicographic range queries. You are given a collection of words (strings), stored ...
Design concurrency-safe shared payment account API
Design concurrency-safe shared payment account API Prevent Double-Spending When Two Users Pay Simultaneously from the Same Account Context You are des...
4.2 Design a Collaborative Document Editor
Real-time collaborative editing is one of those features that feels magical when it works — and absolutely nightmarish to build from scratch. Google D...
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...
Design flight-price search service
Design flight-price search service System Design: Cheapest Flight Search Across Multiple Providers Context Design a backend system that searches multi...
Design API that aggregates three downstream APIs
You are given three existing HTTP JSON APIs owned by other backend services: - Service A: GET /service-a?user_id={id} → returns basic user profile dat...
Design a hot-listing waitlist API
Design a hot-listing waitlist API System Design: Waitlist API for High-Demand Listings Context You are designing a waitlist system for a marketplace t...
Design a Weighted Log Distributor
This question evaluates distributed systems architecture, load-balancing and traffic-routing competencies, along with fault tolerance, backpressure ha...
Identify and mitigate deduplication program risks
System Design: Robust File Deduplication in the Real World Context You are designing a file deduplication tool that scans large directory trees on one...
Design a Redundant Railroad Crossing
Design a safe and redundant control system for an at-grade railroad crossing used by road vehicles and pedestrians. The system should detect approachi...
Design VPC, IP plan, management, storage, SSO
Design VPC, IP plan, management, storage, SSO System Design: Multi‑Layer VPC, IP Planning for 2,000 Servers, Fleet Management, Shared Storage, and SSO...
Design webhook, POI, chat, CI/CD, payments
You are asked to design several large-scale backend systems in a single onsite session. The bar is breadth and judgment under time pressure: for each ...
Design an online auction platform
Design an Online Auction System Design a scalable, highly available online auction platform where users can list items for auction and other users can...
Design log management with auto-deletion
Design log management with auto-deletion Design a Bounded Log Management System with O(1) Victim Selection Context You are designing an in-memory log ...
How would you scale rule evaluation?
Design a scalable expense-policy rule engine for one million rules and thousand-record batches. Covers structured rules, predicate indexes, bitset eva...
Design a group chat system
Design a WhatsApp-like group chat system. Core features: - 1:1 and group conversations - Send/receive text messages (assume small payloads) - Group me...