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Lessons (30)

• CI/CD and Reviewed Production Changes

  Design an automated plan and apply workflow with protected credentials, saved plans, serialization, and drift checks. A useful …

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

  … Memento 💾 Analogy: Save points in a video game. Before the boss fight you save; if you lose, you …

• Your First Terraform Project

  … Applying a saved plan executes that approved plan without a second interactive confirmation. Treat plan files as sensitive …

• Cost Optimization and the Well-Architected Framework

  … Savings Plans save money but reduce agility. Worked cost review: cost per accepted order A monthly bill alone …

• D — Dependency Inversion Principle

  … A higher-order function works just as well: js const makePlaceOrder = ({ saveOrder, sendEmail }) = async (order) = { await saveOrder(order …

• Secrets, Ephemeral Values, and Least Privilege

  … When applying a saved plan, ephemeral values needed during apply must be supplied again. Design runner credential renewal …

• Providers and Your First AWS Resources

  … Run plan again and expect no changes. Plan destruction and review it before applying. An empty bucket can …

• Containers at Scale: ECS Deep Dive and EKS

  … right-size requests, use Spot via Karpenter for tolerant workloads, and use Savings Plans for the stable base …

• Kubernetes Cluster Architecture, Simply

  … the control plane and worker nodes](/img/kubernetes/architecture.svg) Part Simple job --- --- Control plane Receives requests, remembers …

• Database Internals, Replication and Scaling

  Connect storage-engine choices, durability, replicas, query plans, pooling and data layout to real production behaviour. The problem …

• Production Capstone and Interview Practice

  … deliver and inspect Run fmt, validate, tests, and a saved plan. Require a reviewed lock file and serialized …

• Developer Learning Plan and Document-Assistant Capstone

  Follow a practical study plan with deliverables, build a local retrieval baseline, and grow it into an evaluated …

• Safe AWS Deployments with IaC and CI/CD

  … Treat the preview ( terraform plan or CloudFormation change set) as something to review, not an automatic approval. CI …

• State, Remote Backends, and Locking

  … The post-migration plan should not unexpectedly recreate infrastructure. -reconfigure reinitializes configuration without migrating existing state; it is …

• Clean Architecture

  … await this.passwordHasher.hash(password) }); const saved = await this.userRepository.save(user); await this.emailSender.sendWelcome(saved.email …

• Internals, Upgrades, Resilience and Interview Questions

  Know what happens inside the control plane, how to upgrade and back up safely, and answer common senior …

• SOLID at a Glance

  … any exporter works await this.repository.save(file); await this.notifier.notify("Report ready"); } } Do I need SOLID …

• Kubernetes: Start Here

  … registry.example.com/shop-api:1.8.0 You save that as a YAML file and apply it …

• AWS: Start Here

  … order transaction and restore plan What happens if the app crashes after saving? Operations Dashboard and incident runbook …

• What Is Artificial Intelligence? A Developer's Guide

  … new order + saved model → estimated delivery time A prediction is an estimate, not a promise. Changes in traffic …

• Extending Kubernetes: CRDs, Operators and Admission

  Teach Kubernetes new resource types, automate them with controllers, and enforce policy before objects are saved. Kubernetes is …

• Practical Project: Deploy a Real CRM App on EKS

  … Worker nodes and scheduling The EKS control plane does not run your pods. A node group needs running …

• Consumers & Consumer Groups

  … This is the committed offset , saved in Kafka's internal consumer offsets topic. If a consumer crashes, its …

• Event-Driven Architecture

  … store processed event IDs Ordering Partition by entity key (Kafka); include versions/timestamps Lost events when saving + publishing …

• AWS Data Pipelines in Plain Language

  … Include permission and cleanup planning for temporary outputs. Remember this - A data lake is organized files in S3 …

• EC2, Storage and Auto Scaling

  … simple use --- --- On-Demand Short-term, unknown usage Savings Plans Predictable long-running usage Spot Interruptible batch or …

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

  … true } } EOF aws cloudfront create-distribution --distribution-config file://distribution.json \ --query 'Distribution.[Id,DomainName]' --output text Save …

• Backend Design Scenarios

  … Do you shard, partition or add read replicas first, and why? First measure the query plan, indexes, working …

• Caching & Redis

  … Database)] Every layer can answer the request and save all the layers behind it. Strategy 1: Cache-aside …

• AWS Interview Questions: Clear Answers

  … The app saves the order in RDS, then a reliable messaging path triggers confirmation work.” For each component …