Capital One System Design Interview Questions
Practice the exact questions companies are asking right now.
"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."
"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 highly reliable account balance system
Scenario You are designing a backend service that stores and updates user account balances (like a wallet/bank ledger). The system must be highly reli...
Design a cross-region event processing platform
Scenario Design a cross-region event processing platform that ingests events from producers, stores them durably, and delivers them to multiple consum...
Validate virtual credit card transactions from encoded IDs
You are designing logic for a virtual credit card product. Part 1: Product reasoning Explain key benefits and drawbacks of virtual credit cards for: -...
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 mobile banking app backend
Scenario Design the backend system for a mobile banking app. Users can: - Sign up / log in - View balances and transaction history - Transfer money be...
Design a geography-aware virtual card service
Scenario You are asked to design a virtual card number product for a financial app. Users can generate virtual card numbers to pay online/in-store. Th...