System Design Interview: Design a Live Streaming Platform (Twitch) Designing a live streaming platform like Twitch differs significantly from on-demand […]

System Design Interview: Design a Ticketing System (like Ticketmaster) Designing a ticket booking system like Ticketmaster tests your ability to

System Design Interview: Design a Search Engine Designing a search engine tests your understanding of inverted indexes, relevance ranking, distributed

What Is a Metrics and Monitoring System? A metrics system collects numerical measurements from services (request rate, error rate, latency,

What Is a Distributed File System? A distributed file system (DFS) stores files across many machines, exposing them as a

What Is an Object Storage System? Object storage (Amazon S3, Google Cloud Storage) stores arbitrary-size files (objects) in named buckets.

What Is an E-commerce Checkout System? The checkout system orchestrates the final steps of an online purchase: cart validation, inventory

What Is a Social Graph? A social graph represents relationships between users: friendships (Facebook), follow relationships (Twitter/Instagram), professional connections (LinkedIn).

What Is a Payment Processing System? A payment processing system moves money from a buyer to a seller by orchestrating

What Is a Hotel Reservation System? A hotel reservation system lets users search for available rooms, make reservations with guaranteed

What Is a Distributed Key-Value Store? A key-value store maps arbitrary keys to values with O(1) average operations. Distributed key-value

What Is Collaborative Document Editing? Real-time collaborative editing allows multiple users to simultaneously edit the same document, with changes from

What Is a Stock Exchange System? A stock exchange matching engine pairs buy and sell orders in real time, executing

What Is a Database Connection Pool? Opening a database connection is expensive: TCP handshake, authentication, SSL negotiation, session setup —