A deep dive into ticketing system internals: optimistic locking, distributed locks, event sourcing, CQRS, and queue-based processing, with a full booking-request walkthrough.
How to answer the ticketing system interview question: seat reservation, concurrency control, payment timeouts, waitlists, and venue layout modeling.
A component-by-component walkthrough of web crawler architecture: URL frontier queue, fetcher workers, content parser, dedup store, and sitemap discovery, with the data flow connecting them.
A complete framework for the web crawler system design interview: politeness policies, URL frontier design, duplicate detection, and distributed crawling trade-offs interviewers actually probe.
How to design a real-time collaborative document editor: operational transformation vs CRDTs, conflict resolution, and cursor synchronization, framed for the system design interview.
A component-level breakdown of a YouTube-style video platform: upload service, transcoding workers, metadata database, view counters, and CDN, plus how data flows between them.