• Introduction
• Architecture Design Journey - Evolution of Architectures
• Way of Learning - The Course Flow
• Choosing the Right Architecture for Your Application
• How to Follow the Course and Course Slides

• First Problem: Sell Products Online
• Understand E-Commerce Domain - Use Cases - Functional Requirement
• Understand E-Commerce Domain - Non-Functional Requirements

• Introduction - Monolithic Architecture
• When to Use Monolithic Architecture
• Benefits of Monolithic Architecture
• Challenges of Monolithic Architecture
• Design Principles of Monolithic Architecture -- KISS, YAGNI, DRY
• Design the Architecture - E-Commerce App - KISS and YAGNI
• Design and Iterate Monolithic Architecture - E-Commerce Application
• Evaluate Monolithic Architecture - E-Commerce Application
• Problem: Code Becomes Too Complex over Time - Monolithic Architecture - E-Commerce

• Layered (N-Layer) Architecture
• Design Principles - Separation of Concerns (SoC)
• Design principles - SOLID
• Design the Architecture - E-Commerce App - Layered Architecture
• Adapt Technology Stack - E-Commerce App - Layered Architecture
• Demo: Layered Monolithic Architecture Code Review - E-Commerce App
• Evaluate Layered Monolithic Architecture
• Problem: Highly Coupling Dependent Layers

• Introduction the Clean Architecture
• What Is Clean Architecture?
• The Dependency Rule
• Layers of Clean Architecture
• Benefits of Clean Architecture
• Design the Architecture - Clean Architecture - E-Commerce App
• Adapt Clean Architecture - E-Commerce App
• Demo: Clean Architecture Code Review - E-Commerce App
• Evaluate Clean Architecture
• Problem: Increased Traffic, Handle More Requests

• Introduction Scalability - Why We Need to Scale
• Scalability - Vertical Scaling - Horizontal Scaling
• Vertical Scaling - Scale Up
• Horizontal Scaling - Scale Out
• What Is Load Balancer? Use Load Balancer to Split the Load with Consistent Hashing
• Design the Architecture - Scalability - E-Commerce App
• Adapt the Architecture - Scalability - Load Balancer - E-Commerce App
• Evaluate: Clean Architecture with Scalability - Load Balancer - E-Commerce App
• Problem: Agility of New Features, Split Agile Teams

• Introduction - Modular Monolithic Architecture
• What Is Modular Monolithic Architecture?
• Benefits of Modular Monolithic Architecture
• Challenges of Modular Monolithic Architecture
• When to Use Modular Monolithic Architecture
• Monolith First Approaches from Martin Fowler and Sam Newman
• Monolithic Architecture Vertical Considerations, Communications of Monolithic
• Transaction Management of Monolithic Architecture
• Deployments of Monolithic Architecture
• Design the Architecture - Modular Monolithic Architecture - E-Commerce App
• Evaluate: Complexity of Presentation UI Operations- Modular Monolithic Architect
• Problem: Improved customer experience with Separated UI and Omnichannel
• Headless Architecture and Separated Presentation with SPA
• Design the Architecture - Modular Monolithic Architecture with SPA - Separated UI
• Adapt the Architecture - Modular Monolithic Architecture with SPA - Separated UI
• DEMO: Modular Monolithic Architecture Code Review - E-Commerce App
• Evaluate: Modular Monolithic Architecture with SPA
• Problem: Agility of New Features, Split Agile Teams

• Introduction - Microservices Architecture
• What Are Microservices?
• What Is Microservices Architecture?
• Microservices Characteristics
• Benefits of Microservices Architecture
• Challenges of Microservices Architecture
• When to Use Microservices Architecture - Best Practices
• When Not to Use Microservices - Anti-Patterns of Microservices
• Monolithic Versus Microservices Architecture Comparison
• The Database-Per-Service Pattern - Polyglot Persistence
• Design the Architecture - Microservices Architecture - First Iteration
• Adapt the Architecture - Microservices Architecture - First Iteration
• Evaluate: Microservices Architecture - First Iteration
• Problem: Break Down Application into Microservices

• Introduction - Decomposition of Microservices Architecture
• Why Do We Need to Decompose? - The Scale Cube
• Microservices Decomposition Pattern - Decompose by Business Capability
• Microservices Decomposition Pattern - Decompose by Subdomain
• Bounded Context Pattern (Domain-Driven Design - DDD)
• Identify Bounded Context Boundaries for Each Microservices
• Using Domain Analysis to Model Microservices and Checklist after Decomposition
• Analysis E-Commerce Domain - Use Cases
• Analysis E-Commerce Domain - Nouns and Verbs
• Identifying and Decomposing Microservices for E-Commerce Domain
• Design and Adapt Microservices Architecture with Decomposition Patterns
• Evaluate and Problem Microservices Architecture and Client-Service Communication

• Introduction - Microservices Communications - The Basics
• What Is Changed for Communications Between Monolithic to Microservices
• Microservices Communication Types - Synchronous or Asynchronous Communication
• Microservices Communication Styles Request-Driven or Event-Driven Architecture
• Microservices Synchronous Communications and Best Practices
• Designing HTTP-Based RESTful APIs for Microservices
• RESTful API Design for Microservices
• RESTful API Design for Single Microservices
• RESTful API Design for E-Commerce Microservices
• API Versioning in Microservices RESTful APIs
• Design Microservices Architecture with RESTful API Design
• Evaluate: Microservices Architecture with RESTful API Design
• Problem: Multiple Request (N+1) for Retrieving Relational Data
• Graph: QLA Query Language for APIs
• Graph: QL Core Concepts, Schemas, Queries, Mutations, and Resolvers
• Advantages and Disadvantages of GraphQL
• REST Versus GraphQL APIs
• Fetching Data with REST and GraphQL
• Design and Evaluate: Microservices Architecture with GraphQL API Design
• Problem: Inter-Service Communication Makes Heavy Load on Network Traffic
• gRPC: High Performance Remote Procedure Calls
• How gRPC Works
• Main Advantages of gRPC
• When to Use gRPC? Use Cases of gRPC
• gRPC Usage in Microservices Communication
• Design and Evaluate Microservices Architecture with gRPC API Design
• Problem: Chat with Support Agent to Answer Customer Queries
• WebSocket API Real-Time Two-Way Communications
• When to Use WebSocket API and Use Cases of WebSocket API
• Design and Evaluate Microservices Architecture with WebSocket API Design
• Problem: Direct Client-to-Service Communication

• Introduction: Microservices Communication Patterns - API Gateways
• Problems of Direct-to-Microservices Communication
• Why Should We Use API Gateway?
• The Solution - API Gateway Patterns
• Gateway Routing pattern
• Gateway Aggregation Pattern
• Gateway Offloading Pattern
• API Gateway Pattern
• Main Features of API Gateway Pattern
• A Request Flow of API Gateway Pattern
• Design and Evaluate: Microservices Architecture with API Gateway Design
• Problem: Client Apps Have Different UI Requirements
• Backends for Frontends Pattern-BFF
• Design and Evaluate: Microservices Architecture with Backends for Frontend Pattern
• Service-to-Service Communications Between Backend Internal Microservices
• Service-to-Service Communications Chain Queries
• Problem: Service-to-Service Communications Chain Queries
• Service Aggregator Pattern - Microservices Communications Design patterns
• Service Registry/Discovery Pattern - Microservices Communications Design pattern
• Design and Evaluate: Microservices Architecture with Service Aggregator, Registry
• Adapt the Architecture - Microservices Architecture - Second Iteration
• Problem: Long Running Operations Can't Handle Sync Communication

• Introduction - Microservices Asynchronous Message-Based Communication
• Microservices Asynchronous Communication
• Benefits of Asynchronous Communication
• Challenges of Asynchronous Communication
• Asynchronous Message-Based Communication Types in Microservices Architecture
• Single-Receiver Message-Based Communication (One-to-One Model-Queue)
• Multiple-Receiver Message-Based Communication (One-to-Many Model-Topic)
• Design Principles - Dependency Inversion Principles (DIP)
• Fan-Out Publish/Subscribe Messaging Pattern
• Topic-Queue Chaining and Load Balancing Pattern
• Design Microservices Architecture with Fan-Out Publish/Subscribe Messaging
• Adapt: Microservices Architecture with Fan-Out Publish/Subscribe Messaging
• Evaluate: Microservices Architecture with Fan-Out Publish/Subscribe Messaging
• Problem: Databases Create Bottlenecks When Scaling

• What Is Apache Kafka?
• Apache Kafka Benefits
• Apache Kafka Use Cases
• Kafka Components - Topic, Partitions, Offset, and Replication Factor
• Apache Kafka Cluster Architecture
• Apache Kafka Core APIs - Producer, Consumer, Streams, and Connect API
• What Is RabbitMQ?
• RabbitMQ Components - Producer, Queue, Consumer, Message, Exchange, Binding
• RabbitMQ Exchange Types - Direct, Fanout, Topic, and Headers
• RabbitMQ Architecture

• Introduction - Scale the Microservices Architecture Design
• The Scale Cube
• Stateless and Stateful Application Horizontal Scaling

• Introduction - Microservices Data Management
• Polyglot Persistence Principle in Microservices
• Microservices Database Management Patterns and Principles
• Design Patterns - The Database-Per-Service Pattern
• The Shared Database Anti-Pattern and Polyglot Persistence
• Relational and NoSQL Databases - Document, Key-Value, Graph-Based, Column-Based
• NoSQL Databases Types - Document, Key-Value, Graph-Based, Column-Based Databases
• When to Use Relational Databases
• When to Use NoSQL Databases?
• Best Practices When Choosing Data Store - Use Right Tool for Right Job
• How to Choose a Database for Microservices
• CAP Theorem
• Problem: Single Database Server Performs Low Performance
• What Is Data Partitioning? And Why We Are Using Data Partitioning?
• Data Partitioning: Horizontal, Vertical, and Functional Data Partitioning
• Database Sharding Pattern
• Tinder System Design Example of Database Sharding Pattern
• Cassandra NoSQL Database - Peer-to-Peer Distributed Wide Column Database
• Design: Microservices Architecture with Database Sharding Pattern
• Adapt: Microservices Architecture with Database Sharding Pattern - Cassandra
• Evaluate: Microservices Architecture with Database Sharding Pattern - Cassandra
• Problem: Cross-Service Queries and Write Commands on Distributed Scaled Database

• Introduction - Microservices Data Management - Commands and Queries
• Microservices Data Management - Cross-Service Queries
• Problem: Cross-Service Queries with Sync Response, Decouple Way, and Low Latency
• Materialized View Pattern
• CQRS - Command Query Responsibility Segregation Pattern
• CQRS - Benefits and Drawbacks
• Best Practices for CQRS and Instagram Database Architecture with CQRS
• How to Sync Read and Write Databases in CQRS?
• Event Sourcing Pattern
• CQRS with Event Sourcing Pattern
• Eventual Consistency Principle
• Design Instagram System Architecture
• Design Instagram Database Architecture
• Design Microservices Architecture with CQRS, Event Sourcing, Eventual Consistent
• Adapt Microservices Architecture with CQRS, Event Sourcing, Eventual Consistent
• Evaluate Microservices Architecture with CQRS, Event Sourcing, Eventual Consist
• Problem Manage Consistency Across Microservices in Distributed Transactions

• Introduction - Microservices Distributed Transactions
• Transaction Fundamentals and ACID Principles
• Transaction Management of Monolithic Architecture
• Microservices Distributed Transactions
• Microservices Bounded Context for Transactional Boundaries
• Microservices Transactional Boundaries
• SAGA Pattern for Distributed Transactions
• SAGA Pattern - Choreography-Based SAGA Implementation
• SAGA Pattern - Orchestration-Based SAGA Implementation
• Compensating Transaction Pattern
• Problem: Dual Write Problem
• Transactional Outbox Pattern
• Transactional Outbox Pattern in Microservices
• Problem: Listen and Polling Outbox Table
• What Is CDC - Change Data Capture?
• CDC - Change Data Capture with Outbox Pattern
• Implementation of CDC and Outbox Pattern with Cloud Databases - CockroachDB
• Implementation of CDC and Outbox Pattern with Cloud Databases Azure CosmosDB
• Design: Microservices Architecture with SAGA, Outbox Pattern, and CDC
• Adapt Microservice Architecture with SAGA, Transactional Outbox, and CDC Pattern
• Evaluate Microservices Architecture with SAGA, Transactional Outbox, and CDC
• Problem: Handle Millions of Events Across Microservices

• Introduction - Event-Driven Microservices Architectures
• Event-Driven Microservices Architecture
• Real-Time Processing and High-Volume Events in Event-Driven Microservices
• Event Hubs and Event Streaming in Event-Driven Microservices Architecture
• Real-World Examples of Event-Driven Microservices Architecture
• Design Event-Driven Microservices Architecture
• Adapt Event-Driven Microservices Architecture
• Evaluate Event-Driven Microservices Architecture
• Problem: Database Operations Are Expensive, Low Performance

• Introduction - Microservices Distributed Caching
• What is Caching?
• Types of Caching
• Distributed Caching in Microservices
• Cache Hit and Cache Miss
• Caching Strategies in Distributed Caching for Microservices
• Cache-Aside Pattern for Microservices
• Design Microservices Distributed Caching with Cache-Aside Pattern
• Adapt Microservices Distributed Caching with Cache-Aside Pattern
• Evaluate Microservices Distributed Caching with Cache-Aside Pattern
• Problem: Deploy Microservices at Any Time with Zero-Downtime and Flexible Scale

• Introduction - Microservices Deployments with Containers and Orchestrators
• What Are Containers?
• What Is Docker?
• Docker Containers, Images, and Registries
• Why Do We Use Them for Microservices Deployments?
• What Are Container Orchestrators?
• What Is Kubernetes and Why Do We Use Them for Microservices Deployments?
• Kubernetes Architecture
• Kubernetes Components
• Helm Charts with Kubernetes for Microservices Deployments
• Sidecar Pattern and How Does the Sidecar Pattern Work for Microservices Deploy
• Service Mesh Pattern and How the Service Mesh Pattern Work for Microservices
• DevOps and CI/CD Pipelines for Microservices Deployments
• CI/CD Pipeline Steps for Microservices Deployments
• CI/CD Tools for Microservices Deployments
• Deployment Strategies for Microservices Blue-Green, Rolling, and Canary Deploy
• Infrastructure as Code (IaC) and Usage in Microservices Deployments
• Design: Microservices Deployments with Containers and Orchestrators
• Adapt: Microservices Using Containers and Orchestrators
• Evaluate: Microservices with Using Containers and Orchestrators
• Problem: Fault Tolerance Microservices Able to Remain Operational for Any Fail

• Introduction - Microservices Resilience, Observability, and Monitoring
• What Is Microservices Resiliency?
• Microservices Resiliency Patterns
• Retry Pattern
• Circuit Breaker Pattern
• Circuit Breaker States
• Retry + Circuit Breaker Pattern
• Bulkhead Pattern
• Timeout Pattern
• Fallback Pattern
• Microservices Observability with Distributed Logging and Distributed Tracing
• Elastic Stack for Microservices Observability with Distributed Logging
• Microservices Distributed Tracing with OpenTelemetry Using Zipkin
• Microservices Health Checks: Liveness, Readiness, and Performance Checks
• Microservices Health Monitoring with Kubernetes, Prometheus, and Grafana
• Design Microservices Resilience, Observability, and Monitoring
• Adapt Microservices Resilience, Observability, and Monitoring

• Implementation of Microservices Architecture
• Demo Microservices Architecture Code Review - E-Commerce App
• Catalog Microservices Code Review - E-Commerce App
• Basket Microservices Code Review - E-Commerce App
• Discount Microservices Code Review - E-Commerce App
• Ordering Microservices Code Review - E-Commerce App
• API Gateways Microservices Code Review - E-Commerce App
• Client Applications Code Review - E-Commerce App
• Microservices Resilience, Observability, Monitoring Code Review - E-Commerce App

• Introduction - Serverless Microservices
• AWS Serverless Microservices with Patterns and Best Practices
• AWS Lambda as a Microservice
• Mapping Microservice Architecture with AWS Serverless Services for Microservices
• Event-Driven Serverless Microservices Design with AWS Lambda

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