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Lessons (10)

• Design a URL Shortener

  Generate durable short links, redirect in milliseconds, prevent abuse and keep analytics off the redirect path. A short …

• Big Data: ETL, Warehouses and Streaming

  Build reliable analytical pipelines with batch/stream processing, lake and warehouse layers, and explicit freshness contracts. ![Analytics pipeline …

• Message Queues & RabbitMQ

  … each message → EVERY subscriber"] Pr2[Producer] -- X{{exchange}} X -- QA[(email queue)] -- SA[Email svc] X -- QB[(analytics …

• What Is Apache Kafka?

  … everything talks to everything"] A1[Web app] -- D1[(DB)] & S1[Search] & AN1[Analytics] & M1[Monitoring] A2[Mobile API …

• Kafka vs RabbitMQ & the Kafka Ecosystem

  … no Q2{Very high throughput,<br/ event streaming, analytics, CDC?} Q2 -- yes K Q2 -- no Q3{"Complex routing …

• Event-Driven Architecture

  … Payments] O1 -- email E1[Email] O1 -- track A1[Analytics] end subgraph Ev["📣 Event-driven: Orders knows nobody"] O2 …

• How Browsers Render a Page

  … In parallel As soon as downloaded ❌ Independent scripts (analytics) type="module" In parallel Deferred by default ✅ Modern ES …

• Behavioral Patterns I: Observer, Strategy, Command, State

  … reserve(order.items)); orders.on("order:placed", (order) = analytics.track("purchase", order.total)); // The publisher doesn't know …

• Consumers & Consumer Groups

  … 1] C2[consumer 2] end subgraph G2["Group: analytics"] C3[consumer 1] end P0 & P1 -- C1 P2 & P3 …

• Frontend Performance & Core Web Vitals

  … PageSpeed Insights, the web-vitals library or your analytics. Real users on slow phones matter most. Fixing LCP …