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Lessons (17)

• Observability: Logs, Metrics & Traces

  … Instrument once, send the data anywhere. mermaid flowchart LR A[Service A + OTel SDK] -- C[OTel Collector] B …

• Practical Lab: S3 File Upload and CloudFront Delivery with NestJS

  … The AWS SDK discovers the temporary credentials automatically, so your code does not change ; you just leave AWS …

• Serverless Architecture

  … create an order from an HTTP request import { DynamoDBClient } from "@aws-sdk/client-dynamodb"; import { DynamoDBDocumentClient, PutCommand } from …

• Event-Driven Patterns, Step Functions and Reliable Lambdas

  … Reduce cold starts by keeping packages small, initializing SDK clients outside the handler, and choosing arm64 (Graviton) for …

• Serverless: Lambda and API Gateway

  … Keep startup work modest and reuse safe SDK/database client objects where appropriate. Never depend on local memory …

• Structural Patterns: How to Connect Objects

  … text})"] Use when: integrating legacy code, 3rd-party SDKs, or switching providers (Stripe → PayPal) behind a stable interface …

• Clean Architecture in Depth

  … no req , no res , no SQL, no Stripe SDK, no JSON. Just the story of placing an order …

• Extending Kubernetes: CRDs, Operators and Admission

  … Build your own with: Tool Language Notes --- --- --- Kubebuilder / controller-runtime Go Standard choice Operator SDK Go, Ansible, Helm …

• Which Pattern Do I Need?

  … cache/log wrappers 4. 🏨 Facade — service layers and SDKs 5. 📰 Observer — events everywhere, UI and backend 6. 🗺 …

• D — Dependency Inversion Principle

  … wires it automatically)"] Key takeaways - Business logic should depend on interfaces , never on concrete databases, APIs or SDKs …

• REST API Design

  … From it you get interactive docs, client SDK generation, request validation and contract tests. yaml paths: /users/{id …

• Practical Project: Deploy a Real CRM App on EKS

  … the SDK in the pod found no credentials. The fix is a dedicated pod role. Step 1: the …

• Containers at Scale: ECS Deep Dive and EKS

  … through Kubernetes APIs Workload IAM role What its SDK may do through AWS APIs Do not give all …

• Run Containers on AWS with ECR and ECS

  … The task role is used by your application's SDK calls. The distinction matters when an image pulls …

• AWS Security Building Blocks

  … amazon.com/secretsmanager/latest/userguide/retrieving-secrets-python-sdk.html). Tenant authorization after token validation A valid token …

• S3: Store Files Safely

  … The signer creates the URL locally through its SDK using credentials; creating a URL does not require a …

• AWS Interview Questions: Clear Answers

  … Use a task role so the SDK obtains temporary credentials at runtime. Give that role only the application …