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Lessons (17)

• Service Communication: Sync vs Async

  … e.g. 'is this coupon valid?'" Sync[Synchronous: REST / gRPC] Q1 -- no Q2{Is it a notification<br …

• Brokers, Replication & Durability

  … Brokers, leaders and followers, in-sync replicas, min.insync.replicas, leader election and KRaft, drawn step by step …

• Design a File Storage Service

  Upload bytes directly to object storage while the API owns durable metadata, authorization, sharing and synchronization. ![File storage …

• React Hooks in Practice

  … Use it to synchronise with things outside React : subscriptions, timers, browser APIs, non-React widgets. jsx useEffect(() = { // setup …

• Batch vs Stream and Data Modeling

  … read path is costly Duplicates must stay in sync Streams need an ordering key, idempotency, retention and DLQ …

• Kafka Producers

  … fetch + replicate L-- P: ✅ ack (in-sync replicas have it) acks Producer waits for Speed Can lose data …

• CQRS & Event Sourcing

  … a write model for commands, a read model for queries, synced by events](/img/microservices/cqrs.svg) mermaid …

• Helm, kubectl Cheat Sheet & Best Practices

  … in the cluster ( Argo CD or Flux ) continuously syncs the cluster to match. mermaid flowchart LR Dev[🧑 …

• JavaScript Essentials: Event Loop, Closures & this

  … click.</summary 1, 4, 3, 2 1. "1" : synchronous, runs immediately. 2. setTimeout : the callback goes to the …

• Message Queues & RabbitMQ

  … Why use a queue? mermaid flowchart LR subgraph Sync["❌ Synchronous: user waits for everything"] direction LR U1[Signup …

• ConfigMaps, Secrets & Storage

  … values live in a proper vault and are synced in Or Sealed Secrets / SOPS Encrypted files that are …

• Why Kubernetes?

  … someone who makes sure every instrument starts on time, replaces a sick violinist, and keeps everyone in sync …

• What Is Apache Kafka?

  … API] -- K B[Billing] -- K K -- DB[(DB sync)] K -- SE[Search index] K -- AN[Analytics] K -- MON …

• React Fundamentals

  … jsx // ❌ Duplicated state that can get out of sync const [items, setItems] = useState([]); const [total, setTotal] = useState(0 …

• Monolith vs Microservices

  … a database, or call each other in long synchronous chains. You pay the full microservices cost and get …

• TypeScript Essentials

  … never out of sync const user = UserSchema.parse(await response.json()); // throws on bad data tsconfig essentials json …

• What Is Software Architecture?

  … the whole system shaped? Monolith or microservices, layers, sync vs async, which database, where the business logic lives …