Senior+ System Design Interview Questions
System design is the round that carries the most weight in a senior+ loop, and it's where senior+ candidates most often pass or fail. These system design questions were reported from senior-level interviews, so they reflect what interviewers actually push on at the senior+ bar: designing for scale, reasoning explicitly about trade-offs, handling failure modes, and driving the conversation instead of waiting to be led. Expect open-ended prompts — design a rate limiter, a news feed, a notification system — where the interviewer probes your bottlenecks and asks you to defend every decision. Each comes with a detailed model answer that walks through requirements, the high-level design, the deep dives, and the trade-offs a strong senior+ answer makes explicit.
"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 Scalable and Polite Web Crawler
Design a horizontally scalable web crawler with a durable frontier, host-level politeness, deduplication, parsing, and recrawl planning. Examine URL n...
Design High-Throughput Messaging Infrastructure
This question evaluates understanding of high-throughput messaging infrastructure, including database optimization strategies, message queue architect...
Design a Relational-to-DynamoDB Migration System
Design a production migration system that moves an existing e-commerce service from a relational database to DynamoDB with minimal downtime. Your desi...
Design a fast host listing metrics page
Design the backend for a host (landlord) listings page. User flow: - Host opens a page showing many of their listings. - Host selects a date range. - ...
Design a Dependency-Aware CI/CD Pipeline
Design a dependency-aware CI/CD platform that schedules DAG jobs on isolated runners and preserves logs, artifacts, and durable execution state. Addre...
Design a GPU Telemetry Collection and Analytics Platform
Design a platform that collects GPU telemetry from a large compute environment and exposes both high-level trend analytics and low-level drilldowns. T...
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 a Global Calendar Service
Design a calendar system for users in multiple time zones. The system should support: - creating, updating, deleting, and viewing calendar events - on...
Build a Firmware Data Quality and Release-Feedback Framework
Design a firmware telemetry quality framework that brings data and firmware teams together around versioned contracts, pre-release tests, canary check...
Design an Airbnb wallet with holds and payouts
Design and Implement an Airbnb-Style Wallet (Ledger, Holds, FX, Idempotency) Problem Design and implement an Airbnb-style wallet system. This is an OO...
Design a location-based radius top-K search
Design a location-based search service. Input: - latitude, longitude - radius (meters) - K Output: - The top K locations within the radius. The term “...
Design a low-latency trading platform
This question evaluates a candidate's ability to design a low-latency, real-time trading system, covering competencies in distributed systems, streami...
Design a News Aggregation Feed
Design a large-scale news aggregation feed similar to a major news app. The system ingests a large volume of raw news articles from many sources, incl...
Design booking and settlement systems
You may be asked one or more backend-heavy system design problems such as: 1. Design a reserved-seat ticketing platform similar to a concert or sports...
Design restaurant shift scheduling
This question evaluates skills in data modeling, backend system architecture, API design, scalability engineering, and consistency management for a mu...
Design a metrics platform without alerting
This question evaluates a candidate's ability to design a scalable time-series metrics platform, covering data modeling for counters/gauges/histograms...
Design authorization and audit logging systems
This question evaluates competency in designing secure authorization and audit logging systems, including access-control models (RBAC/ABAC/hybrid), po...
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 a Real-Time Auction Platform
Design a real-time online auction platform. Users can browse an auction, submit bids, and see the current highest bid and bid history update live. Tra...
Design an Online Judge and Live Comments
The onsite included two system design prompts: 1. Design an online judge platform where users submit code for programming problems. The system must su...