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Lessons (15)

• Delivery Guarantees: At-Most, At-Least & Exactly Once

  … It always arrives, but sometimes the recipient gets two. - Exactly once ✅: it always arrives, and exactly one copy …

• Exactly-Once Payment Processing

  … customer, amount, and checkout intent: charge at most once . A retry returns the original outcome; it does not …

• Binary Search

  … search on a condition Binary search works on anything where a yes/no question flips exactly once : text …

• Message Queues & RabbitMQ

  … At least once ⭐ Never lost, may be duplicated Ack after processing + idempotent consumers Exactly once Never lost, never …

• React vs Vue vs Angular

  … tracked dependencies"] V1[ref changes] -- V2["Proxy knows exactly<br/ which parts use it"] -- V3[update only those …

• Creational Patterns: How to Make Objects

  … Singleton 🏛️ Analogy: A country has exactly one government. Everyone who asks "who's in charge?" gets the …

• Consumers & Consumer Groups

  … Each partition is read by exactly one consumer in a group at a time. 2. One consumer can …

• Kafka vs RabbitMQ & the Kafka Ecosystem

  … filtering, mapping, joining streams, windowed aggregations, with exactly-once support. No separate cluster needed; it runs inside your …

• Data in Microservices: Sagas & the Outbox Pattern

  … inbox (idempotency) on the consumer side gives effectively exactly-once processing. Querying across services "Show orders with customer …

• Deployments, ReplicaSets & Rollouts

  … shop-api-7d9f<br/ (keeps exactly 3 pods alive)"] RS -- P1[📦 pod 1] RS -- P2[📦 pod 2] RS …

• ConfigMaps, Secrets & Storage

  … The guitar is the container image; the set list is the configuration. Build the image once, configure it …

• API Gateway, BFF & Service Discovery

  … one endpoint shaped exactly for the home screen app.get("/mobile/home", async (req, res) = { const [user, orders …

• Observability: Logs, Metrics & Traces

  … Then from a slow trace you can jump straight to the logs of exactly that request. OpenTelemetry: one …

• Normalization & Denormalization

  … one fact, one home Normalization organizes a relational database so a fact is stored once, in the table …

• Frontend Performance & Core Web Vitals

  … Google measures exactly these three feelings with the Core Web Vitals . ![The three Core Web Vitals and their …