Software Engineer System Design Interview Questions
Practice 904 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 async API with idempotency
System Design: Asynchronous API Call With Idempotency Design an HTTP API that triggers a long-running operation (seconds to minutes) against downstrea...
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 Points-from-Transactions Service
Design a Scalable Loyalty Points Service (USD → Points at 1 USD = 1.5 Points) You are designing a service that awards loyalty points for purchase tran...
Design in-memory DB with TTL and history
In-Memory Database: Progressive Design in 4 Levels You are designing a simplified in-memory database to be implemented in four progressive levels. Eac...
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 a scalable banking system
System Design: Online Banking Platform Context Design an online banking platform (scope similar to a credit-card application system) that supports: - ...
Design a Ride-Hailing Platform
Design a large-scale ride-hailing platform similar to a taxi-booking app. The system should allow riders to request trips, match them with nearby driv...
Design a pipeline orchestration system on Kubernetes
Design a pipeline/workflow orchestration system (similar to a DAG-based scheduler) that runs workloads on Kubernetes. Functional requirements - Users ...
Design favorites and social game recommendations
Problem Design a backend system for a gaming app that supports: 1. Favorites ("Fav"): users can favorite/unfavorite games and view their favorites lis...
Design an online auction system
Design an online auction system (eBay-style). Requirements: - Users create auctions with start/end time and starting price. - Users place bids; system...
Design concurrent range-aware file caching client
System Design: High-throughput Client-side Ranged-read File Cache You are asked to design and specify a client-side cache that accelerates ranged read...
Design an image-to-multilanguage translator
Scenario Design a service that lets users upload an image containing text (e.g., a menu, screenshot, street sign), and returns the same image with the...
Design an On-Demand Delivery Platform
Design an on-demand local delivery marketplace for restaurants or grocery stores. The platform should support customers browsing merchants, building s...
Design load balancing, caching, and idempotent APIs
You are designing a backend service that will be deployed across multiple instances behind a load balancer. Answer the following: 1) Load balancing - ...
Design multi-core service startup scheduler
Service Startup Scheduler on a Host with M CPU Cores Context You are given a directed acyclic graph (DAG) of services where an edge u → v means servic...
Explain Kubernetes autoscaling and traffic routing
In Kubernetes: 1) How does autoscaling work (pod and node scaling)? 2) How is traffic routed from outside the cluster to the right Pods? 3) What are t...
Design car rental schema and APIs
System Design: Car Rental Platform Design the backend for a car rental platform (think a regional chain like Hertz or Enterprise). The system lets cus...
Design a multi-carrier parcel delivery system
Design a system for shipping customer parcels that supports multiple delivery partners/carriers (e.g., UPS, USPS, FedEx). Your system should enable an...
Build AI-Assisted Full-Stack Transactions App
Build a minimal full-stack app for monetary transactions This is the "AI coding" round: using an AI coding tool of your choice (e.g., Cursor), build a...
Design Robust Large-Input Processing
The string-reduction algorithm above is now part of a backend service. Each job reads a text object from S3-compatible storage, applies the transforma...