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Lessons (15)

• Go Concurrency: Goroutines, Channels and Context

  Concurrency vs parallelism, goroutines and the scheduler, buffered and unbuffered channels, select, WaitGroup, Mutex and atomics, worker pools …

• Design a Reliable Notification System

  … Create a durable notification intent with recipient, template version, channel and business-event identity. 2. Route urgent and …

• Message Queues & RabbitMQ

  … crypto.randomUUID() }, // write to disk ); js // consumer.js const channel = await connection.createChannel(); await channel.assertQueue("emails", { durable …

• The Hot SKU Alert Problem

  … Give each delivery a stable identity such as product/version/user/channel, isolate bulk capacity, and apply preference …

• Backend Languages: Node.js, Go, Python & Rust

  … NestJS adds structure. - Go: goroutines and channels, simple and fast, the language of cloud infrastructure. - Python: the king …

• Behavioral Patterns II: Chain, Template, Iterator, Mediator, Memento, Visitor

  … Iterator 📺 Analogy: A TV remote's "next channel" button. You don't need to know how channels are …

• Rust: Types, Errors and Concurrency

  … many producers, one consumer let (tx, rx) = mpsc::channel(); for id in 0..3 { let tx = tx.clone …

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

  … Observer (Pub/Sub) 📰 Analogy: A YouTube channel. You subscribe once; every new video, you get notified. The channel …

• I — Interface Segregation Principle

  … Your grandmother only wants to change channels. Every extra button is confusion and a chance to open the …

• KISS: Keep It Simple, Stupid

  … welcomeTemplate(user) }); } When you have five notification channels, a strategy pattern may earn its place. With one, it …

• Choosing a Programming Language

  … loop + async/await asyncio , threads (GIL), processes Goroutines + channels Threads + async (Tokio), no data races Startup / deploy node …

• Event-Driven Architecture

  … fact, past tense OrderPlaced { orderId, total, at } Event channel / broker Delivers events to consumers Kafka, RabbitMQ, SNS/SQS …

• Go Fundamentals

  … float64 0 string "" bool false pointer, slice, map, channel, func, interface nil struct every field at its zero …

• A WhatsApp OTP Is Only Single Use If You Make It So

  … They are no longer useful and they hold security-relevant data. - Messaging channels are not secure. Anyone who …

• 500 Users Upload Documents at Once: Design the Background Job Pipeline

  … 5. Track: the frontend polls GET /jobs/{id} (or listens on a real-time channel) and shows queued …