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."
Design backend to score and classify tweets
This question evaluates backend system design skills including data modeling and ingestion, integration with external LLM-style inference APIs, worker...
Design cron scheduler and reward/review system
System Design: Company-Wide Scheduler Platform and Employee Review & Rewards System You are designing two platforms for a fast-growing, multi-tenant t...
Design tables from metrics
Data Modeling Design Task: Short‑Video Social App Analytics You are designing an analytics data model for a short‑video social application. The app su...
Design cloud storage with quotas and compression
System Design: Multi‑Tenant Cloud Storage Service (Take‑Home) You are tasked with designing a multi‑tenant cloud storage service that supports file up...
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 a global multi-game leaderboard
Design a Global, Multi‑Game Leaderboard (Ladder) Service You are designing a global leaderboard platform used by many different games and modes. Each ...
Design an Instagram-like photo-sharing platform
System Design: Instagram-like Photo and Short-Video Platform Goal Design an Instagram-like platform for photos and short videos. The design should cov...
Migrate a monolithic wallet to microservices
System Design: Migrating a Monolithic Digital Wallet (Apple Cash–like) to Microservices Context You operate a high-scale consumer digital wallet and p...
Make algorithm code production-ready
Productionizing a Sliding-Window String Algorithm Context: You have implemented a correct sliding-window algorithm for a classic string task (e.g., lo...
Design a scalable real-time chat system
System Design: Real-Time Chat (1:1 and Groups) Context Design a mobile-first, globally available real-time chat system that supports both 1:1 and grou...
Design a basic bank system API
In-Memory Bank System: API, Data Model, Invariants, Semantics, and Edge Cases Goal Design and implement an in-memory bank system that supports account...
Improve and measure service performance
Assessing and Improving a Service’s Performance Under High Load Context You are responsible for a user-facing, stateless HTTP microservice that handle...
Implement auth and profile APIs
Design an In-Memory HTTP API for Auth and Profile Management Context Design a minimal, single-node, in-memory HTTP API that supports user registration...
Design a memory usage switcher with thresholds
System Design: In-Process Memory Usage Switcher Context You are designing an in-process memory guardrail for a backend service. The component monitors...
Design a lazy-initialized connection pool
Question Design and implement a thread-safe, lazily initialized connection pool. You are given an immutable base class Connection (you cannot modify i...
Design a fitness tracking app
This question evaluates a candidate's competency in designing end-to-end backend architectures, specifying core APIs, modeling workout and geospatial ...
Design a Scalable Post, Feed, and Search Service
Design a Scalable Post, Feed, and Search Service Design a social-post service with three core capabilities: a user can publish a text post, retrieve a...
Design a payment system with holds and batching
This question evaluates a candidate's competency in designing reliable, auditable payment workflows, covering authorization holds, batch settlement, i...
Design a scalable URL shortener with expiration and security
System Design: URL Shortening Service at Internet Scale You are asked to design a URL shortening service for hundreds of millions of users with high a...
Define a Git workflow for CI
Define a Git workflow for CI Design a Git Branching and Release Strategy for a Graphics Testing Repository Context You are designing the source contro...