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 scheduled payments and cancellation
Question Design a scheduled payments service for Coinbase that lets users create, list, update, execute, and cancel future-dated payments — both one-t...
Plan a major database version upgrade
You have an application tier (API/web servers) talking to a primary database for writes and a secondary/replica database for reads. You need to perfor...
Design in-memory DB with TTL and backup
Question Design and implement an in-memory, versioned key → (field → value) database that supports per-field TTL, time-travel reads, lexicographically...
Design an IAM system for services and users
System Design Prompt Design an Identity and Access Management (IAM) system for an organization/platform. The system must support: - Human users and se...
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...
How would you throttle a crawler?
The crawler above is now a production service. Expanding each page requires an outbound HTTP or API call to fetch its links, and upstream services may...
Design fast search for AV raw logs
Autonomous vehicles collect large volumes of raw logs (e.g., sensor streams, perception outputs, planning/debug signals). In these logs, there may be ...
Design a scalable news feed system
Design the backend for a social app's news feed You are designing the backend that powers a mobile social app's home feed (a Twitter/Instagram-style h...
Extend rules for trip-level aggregates and outputs
Extend Rules Engine: Aggregate Trip-Level Policies Context You previously built an expense policy engine that evaluates per-expense rules (e.g., "a si...
Design a price drop tracking service
Design a price tracking service like CamelCamelCamel. Requirements: - Users track products and receive alerts when price drops below a threshold. - Pe...
Design an ad click aggregation service
Design a backend service that ingests ad impression and click events and provides aggregated metrics. Requirements: - Ingest a high-volume stream of e...
Design a content moderation system
Design a content moderation system for a large-scale product where users can submit content (e.g., text posts, images, videos, comments, or messages)....
Design read-heavy org chart subordinate counts
You are given manager→direct-report relationships for an organization (an employee has at most one direct manager; the top-level employee has none). B...
Design a log filtering and analytics service
Question Design a log-processing service that ingests application logs at scale and supports the following capabilities: 1. Filter logs by attributes ...
Design resilient auth with flaky third-party tokens
System Design: Resilient, Secure Request Flow with Unreliable Third‑Party Authorization Context You are designing a multi‑region, HTTP/JSON API where ...
Design review system with voting and rewards
Design a Scalable Product Review System with Voting and Rewards You are designing a reviews feature for a large e-commerce marketplace. Customers can ...
Design reliable high-volume chatbot system
You are designing the backend for a chatbot / AI assistant service (similar to a support bot or meeting assistant). Many users may send messages at th...
Design real-time modules communication and overload handling
You are designing a real-time system running on a single machine with two modules (e.g., producer -> consumer) that must communicate with low latency....
Design a multi-level parking system
System Design: Multi‑Level Parking System Context Design the backend for a multi‑level parking facility. The system must track floors, rows, parking s...
Design a Real-Time Monitoring System
Design a real-time monitoring system for a large production environment. The system should: - collect time-series metrics such as CPU, memory, request...