Core Programming Languages ├── JavaScript/Node.js (Runtime) ├── Python ├── Java ├── Go └── C# (.NET)

Backend Frameworks ├── Node.js Ecosystem │ ├── Express.js │ ├── NestJS │ ├── Fastify │ └── Koa ├── Python Ecosystem │ ├── Django & Django REST Framework │ ├── FastAPI │ ├── Flask │ └── Pyramid ├── Java Ecosystem │ ├── Spring Boot │ ├── Micronaut │ └── Quarkus ├── Go Ecosystem │ ├── Gin │ ├── Echo │ └── Fiber └── C# Ecosystem ├── ASP.NET Core └── Nancy FX

API Development & Architecture ├── API Paradigms │ ├── RESTful APIs │ ├── GraphQL (Apollo, Hasura) │ ├── gRPC │ └── WebSocket & Real-time APIs ├── API Documentation │ ├── OpenAPI/Swagger │ ├── Postman Collections │ └── GraphQL Playground └── API Security ├── Rate Limiting ├── Input Validation ├── API Versioning └── CORS Configuration

Databases & Data Storage ├── SQL Databases │ ├── PostgreSQL │ ├── MySQL │ ├── SQL Server │ └── SQLite (Development) ├── NoSQL Databases │ ├── MongoDB │ ├── Redis (Caching & Sessions) │ ├── Cassandra │ └── DynamoDB ├── ORMs & Query Builders │ ├── Prisma, Sequelize, TypeORM │ ├── SQLAlchemy, Django ORM │ ├── Hibernate (Java) │ └── Entity Framework (.NET) └── Data Caching ├── Redis, Memcached ├── CDN Integration ├── Database Query Caching └── In-Memory Caching

Authentication & Authorization ├── Authentication Methods │ ├── JWT (JSON Web Tokens) │ ├── OAuth 2.0 & OpenID Connect │ ├── Session-Based Authentication │ └── API Keys ├── Identity Providers │ ├── Auth0 │ ├── AWS Cognito │ ├── Firebase Auth │ └── Okta └── Security Practices ├── Password Hashing (bcrypt) ├── SSL/TLS Encryption ├── CSRF Protection └── Security Headers

Message Brokers & Background Jobs ├── Message Queues │ ├── RabbitMQ │ ├── Apache Kafka │ ├── AWS SQS │ └── Redis Pub/Sub ├── Background Processing │ ├── Celery (Python) │ ├── Bull Queue (Node.js) │ ├── Sidekiq (Ruby) │ └── Hangfire (.NET) └── Event-Driven Architecture ├── Event Sourcing ├── CQRS Pattern ├── Domain-Driven Design └── Microservices Communication

Cloud Platforms & Infrastructure ├── Major Cloud Providers │ ├── AWS (EC2, Lambda, RDS, S3) │ ├── Google Cloud Platform │ ├── Microsoft Azure │ └── DigitalOcean ├── Serverless Computing │ ├── AWS Lambda │ ├── Google Cloud Functions │ ├── Azure Functions │ └── Vercel/Netlify Functions └── Cloud Services ├── Object Storage (S3, Cloud Storage) ├── Managed Databases (RDS, Cloud SQL) ├── CDN (CloudFront, Cloud CDN) ├── Container Services (ECS, Kubernetes)

Containerization & Orchestration ├── Containerization │ ├── Docker │ ├── Docker Compose │ └── Best Practices ├── Orchestration │ ├── Kubernetes │ ├── Docker Swarm │ ├── AWS ECS │ └── Managed Kubernetes (GKE, EKS, AKS) └── Package Management ├── Helm Charts ├── Docker Registries └── Infrastructure Templates

DevOps & CI/CD ├── Infrastructure as Code │ ├── Terraform │ ├── AWS CloudFormation │ ├── Pulumi │ └── Ansible ├── CI/CD Pipelines │ ├── GitHub Actions │ ├── GitLab CI/CD │ ├── Jenkins │ └── CircleCI └── Monitoring & Observability ├── Logging (ELK Stack, Loki) ├── Metrics (Prometheus, Grafana) ├── APM (New Relic, Datadog) ├── Distributed Tracing (Jaeger) └── Health Checks & Alerts

Testing Strategies ├── Testing Pyramid │ ├── Unit Testing (Jest, pytest, JUnit) │ ├── Integration Testing │ ├── End-to-End Testing │ └── Contract Testing ├── Test Doubles │ ├── Mocks, Stubs, Fakes │ ├── Test Containers │ └── API Mocking └── Performance Testing ├── Load Testing (k6, Artillery) ├── Stress Testing ├── Benchmarking └── Profiling

Development Best Practices ├── Code Quality │ ├── ESLint, Prettier, Black │ ├── Code Reviews │ ├── Git Hooks │ └── SonarQube ├── Design Patterns │ ├── MVC, Repository Pattern │ ├── Factory, Singleton │ ├── Middleware Pattern │ └── Dependency Injection └── Architecture Patterns ├── Monolith vs Microservices ├── Hexagonal Architecture ├── Clean Architecture └── Serverless Architecture

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