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Lessons (11)

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

  … file) │ ──► Job database (id, status, attempts, error) ↓ Task queue (Redis or RabbitMQ) ↓ Background workers ↓ ↓ Vector database Job database …

• Message Queues & RabbitMQ

  … ops Redis Streams / BullMQ In-memory streams Lightweight background jobs in Node.js NATS Lightweight pub/sub Low …

• Service Communication: Sync vs Async

  … sync for queries the user waits on, events for state changes, queues for background jobs.

• Concurrency, Resilience & Distributed Workflows

  … A production job should have: - a durable queue and a unique job ID; - a visibility timeout or lease …

• Observability and Incident Response

  … one propagated context through HTTP, queues and background jobs. - Logs: structured, searchable events with no secrets or unnecessary …

• AWS: Start Here

  … On AWS, choose a service for each job: Part of the shop Example AWS choice Why it exists …

• JavaScript Essentials: Event Loop, Closures & this

  … the chef picks it up once the current job is finished. ![The event loop: call stack, Web APIs …

• Kafka vs RabbitMQ & the Kafka Ecosystem

  … event sourcing, real-time analytics. ✅ RabbitMQ shines for: background job queues ("resize this image"), request/reply, complex routing …

• AWS Interview Questions: Clear Answers

  … the receipt at a deterministic object key, record job completion safely, then acknowledge the message. Does serverless mean …

• Scaling, Load Balancing & Rate Limiting

  … If A is unhealthy, choose B It commonly performs several jobs: 1. Traffic distribution: spread connections or requests …

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

  … used" after creating the session, or in a background job. - Storing the plain code, or hashing it with …