Software Engineer System Design Interview Questions
Practice 1,093 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."
Compare heap, stack, Protobuf, gRPC, SQL, CI/CD
Compare heap, stack, Protobuf, gRPC, SQL, CI/CD Technical/Phone Screen: Core Systems and Data Concepts You are interviewing for a Software Engineering...
Design a bank system with scheduling and rankings
Design a bank system with scheduling and rankings Design an In‑Memory Bank System (Technical Screen) You are designing an in‑memory bank ledger that s...
Design Disk-Based Inventory Serving
Design software for a machine that has no SSD storage and only a small amount of RAM. The machine must service inventory requests using spinning disks...
Scale Digit-Square Convergence Requests
Design a service that receives very high request volume for the digit-square convergence operation. For each request, the input is a positive integer ...
Guide and override compiler optimizations
Guiding a Compiler for a VLIW-like Backend You are optimizing hot loops for a VLIW-like target (e.g., DSP/AI accelerator) where the compiler sometimes...
Design viewing history and resume service
Design: Watched-Video and Resume Playback Service Context Design a backend service that records each user’s watched video list and lets them resume an...
Design distributed transactions protocol
System Design: Distributed Transactions Across Multiple Services Context You must design a distributed transactions protocol to coordinate updates acr...
Design a scalable calendar system
System Design: Multi-Tenant Calendar at Massive Scale You are designing a multi-tenant calendar platform used by hundreds of millions of users across ...
Design locker allocation service
Design a Best-Fit Locker Assignment Component Context You are designing the locker-assignment component for a Locker OS used at physical locker banks ...
Describe CAP, distributed systems, multithreading experience
CAP Theorem, Distributed Systems Design Decisions, and Multithreading Context Provide a structured answer that both explains the concepts and shows ho...
Design an artifact store on K8s and Cassandra
System Design: Exactly-Once Creation by Name on Cassandra, Deletes, and Read API Design Context You run a Java web API on Kubernetes backed by a Cassa...
Design an elevator control system
Elevator Control System Design (N floors, M elevators) Context You are designing a multi-elevator control system for a building with N floors (1..N) a...
Design a keyboard and mouse input system
Question Design an input processing system that captures keyboard and mouse events and can reliably reconstruct what the user typed (answering "what d...
Design distributed word count without MapReduce
System Design: Distributed Word Frequency Counting (No MapReduce) Context You need to design a distributed system that computes word frequencies over ...
Analyze end-to-end request latency
Question Provide a detailed approach to analyze and improve the end-to-end latency of a web request. The request flows from a browser through a CDN, l...
Design a Multi-Channel Message Queue
Design a Message Queue with Multi-Channel Messages and Channel-Based Subscriptions Context You are asked to design a message-queue data structure wher...
Design a streaming ads system
System Design: Ad-Insertion Platform for Live and On-Demand Video Context You are designing an end-to-end ad-insertion platform for a consumer video s...
Design banking with scheduled transfers and merges
Design banking with scheduled transfers and merges In-Memory Banking System with Scheduled Payments and Account Merges Design and implement a single-t...
Design a large-scale news app with caching
Scenario Design a simplified news app (mobile + web) for a very large user base. Users can: - open the app and see a personalized news feed - open an ...
Design a configurable monthly API rate limiter
This question evaluates system-design and distributed-systems skills, focusing on scalable API rate limiting, per-user monthly quota configuration and...