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 Collaborative Todo List
Design a collaborative todo-list service — think shared lists where teammates add, edit, assign, reorder, and complete items, and see each other's cha...
Design Calendar Event Conflict Handling
Design the event settings and conflict-handling system for a large-scale calendar product similar to Google Calendar. Users can create, update, and de...
Design a Scheduler for ML Training and Batch Inference Jobs
Design a Scheduler for ML Training and Batch Inference Jobs Design a scheduler for machine-learning compute jobs. Focus on training and batch inferenc...
Design a Distributed Rate Limiter
This question evaluates expertise in distributed systems and real-time rate-limiting, covering scalability, low-latency design, concurrency control, c...
Diagnose why a scaled system became slow
This question evaluates proficiency in diagnosing performance regressions in scaled production services, emphasizing observability, bottleneck identif...
Design a Library Management System (API and Schema)
This question tests practical system design skills by requiring candidates to model a relational data schema and REST API for a library lending system...
Model Flights, Passengers, Bookings, and Seat Holds
Design a relational data model for a flight-booking service that must support these operations efficiently: - Book a passenger on a flight. - Retrieve...
Design APIs for a Voting System
Design APIs for a Voting System Design the APIs and core data model for a voting system. Begin by clarifying the type of vote: identified or anonymous...
Design a Real-Time Chat System
This system design question tests a candidate's ability to architect a scalable real-time messaging platform, focusing on transport protocol selection...
Design alerting for application-to-exchange mappings
Problem: Alerting design for application→exchange mappings You are building a service that receives an ordered stream of mapping events: - register(ap...
Design a Product Photography Upload Service
Design a Product Photography Upload Service Design a service for a commerce platform's product-photography workflow. A merchant ships an item to a stu...
Design a Shared Calendar Service
Covers designing a shared calendar service: the database schema for events and recurring rules, reminders, and multi-user sharing and permissions. Inc...
Design an IP Address Filtering Service
Design an IP Address Filtering Service Design a service that decides whether network requests should be allowed or denied based on source or destinati...
Design a Payment Processing System
This system design question evaluates a candidate's ability to architect a backend payment system that stays correct under retries, concurrency, and p...
Design a Bookstore Pricing API with Batch Fetches
Design a Bookstore Pricing API with Batch Fetches In a high-level system-design discussion, design the HTTP interface and supporting service for fetch...
Design a Distributed Web Crawler
Design a Distributed Web Crawler Scenario Design a distributed crawler for an encyclopedia-style site. Starting from seed URLs, it should fetch allowe...
Design a Crash-Resilient LRU Cache
You have an in-memory LRU cache with fixed capacity $N$ and the standard get(key) / put(key, value) operations, both $O(1)$ (a hash map plus a doubly ...
Design signup and login service
Design a basic email/password authentication service that supports user sign-up and login. You may not rely on third-party identity providers (no OAut...
Design camera-footage upload with custody chain
System design prompt You’re building a backend service for uploading recorded body-camera / dashcam footage from client devices (often on unreliable n...
High Availability and Failover for a Primary-Replica Database
This question evaluates a candidate's understanding of database high-availability design, including replication semantics, failure detection, and fail...