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https://github.com/suryanshvermaa/microservices

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This repo is for microservics conceps and implementations with golang

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README 

          
# 🚀 My Microservices Architecture Journey



A comprehensive personal learning repository where I explore microservices architecture from theory to practice. This repository documents my journey through distributed systems, combining extensive theoretical study with hands-on implementations in Go and Node.js.



## 📋 Table of Contents



- [🎯 About This Project](#-about-this-project)

- [📚 My Learning Structure](#-my-learning-structure)

- [🏗️ Architecture Implementations](#️-architecture-implementations)

- [📖 Personal Learning Path](#-personal-learning-path)

- [💻 My Implementations](#-my-implementations)

- [🛠️ Technologies I Used](#️-technologies-i-used)

- [🚀 How to Run My Projects](#-how-to-run-my-projects)

- [📡 API Examples](#-api-examples)

- [🐳 Deployment Setup](#-deployment-setup)

- [📚 My Study Notes](#-my-study-notes)

- [🎯 What I Learned](#-what-i-learned)

- [📄 License](#-license)



## 🎯 About This Project



This is my personal exploration of microservices architecture, created to deepen my understanding of distributed systems. The repository serves multiple purposes:



### 📚 **My Theoretical Foundation** (`/concepts`)

My comprehensive study notes covering microservices architecture from fundamentals to advanced patterns. These are my personal interpretations and learnings from various sources, organized for future reference.



### 🐹 **My Go Implementation** (`/golang`)

My production-ready e-commerce microservices platform built with Go. This demonstrates my understanding of gRPC communication, GraphQL API gateways, and containerized deployments.



### 🟨 **My Node.js Implementation** (`/nodejs`)

My modern code snippet management platform showcasing TypeScript microservices with a React frontend. This represents my exploration of web-based microservices patterns.



## 📚 My Learning Structure



```

my-microservices-journey/

├── 📖 concepts/                    # My microservices study notes

│   ├── readme.md                   # My complete learning guide

│   ├── TheArchitecturalEvolution.md # How I understand system evolution

│   ├── BuisinessRequirements.md    # Business drivers I studied

│   ├── Views.md                    # Stakeholder perspectives I learned

│   ├── HexagonalArc.md            # Clean architecture principles I applied

│   ├── APIGateways.md             # Gateway patterns I explored

│   ├── decomposition.md           # Decomposition strategies I learned

│   ├── EventdrivenArchitecture.md # Event-driven patterns I studied

│   ├── EventStreams.md            # Streaming concepts I mastered

│   ├── EventProcessing.md         # Processing patterns I implemented

│   ├── ScalingMS.md               # Scaling strategies I researched

│   ├── Queues.md                  # Queue patterns I explored

│   ├── ChallengesWithMS.md        # Challenges I discovered

│   ├── ModularMonolith.md         # Alternative approaches I considered

│   ├── EDATakeways.md             # Key insights I gained

│   ├── msConsiderations&Concepts.md # Advanced concepts I studied

│   └── images/                     # Diagrams I created/collected

│

├── 🐹 golang/                      # My Go microservices project

│   ├── docker-compose.yml          # My container orchestration

│   ├── go.mod & go.sum            # My Go dependencies

│   ├── README.md                   # My Go project documentation

│   └── services/

│       ├── account/                # My user account service

│       ├── catalog/                # My product catalog service

│       ├── order/                  # My order processing service

│       └── graphql/                # My GraphQL API gateway

│

├── 🟨 nodejs/                      # My Node.js microservices project

│   ├── client/                     # My React frontend application

│   ├── snippet/                    # My code snippet service

│   └── comments/                   # My comment service

│

├── LICENSE                         # MIT License

└── README.md                       # This personal documentation

```



## 🏗️ Architecture Implementations



### 📚 My Conceptual Learning Journey

I've documented my complete understanding of microservices evolution:



```

My Learning Path: Monolith → Macroservices → Microservices → Event-Driven

                      ↓           ↓              ↓              ↓

Understanding:    Tight        Some           Loose        Completely

                 Coupling    Independence    Coupling      Decoupled

```



**My Study Modules:**

- **Foundations**: How I learned architectural evolution and business requirements

- **Core Patterns**: My exploration of hexagonal architecture and API gateways  

- **Communication**: My study of inter-service communication and event-driven patterns

- **Advanced Topics**: My research into scaling strategies and operational concerns

- **Trade-offs**: My analysis of challenges and alternative approaches



### 🐹 My Go E-commerce Platform

Production-ready system I built to understand distributed microservices:



```

                    ┌─────────────────────┐

                    │   My GraphQL        │

                    │     Gateway         │

                    │    (Port 8080)      │

                    └─────────┬───────────┘

                              │ gRPC

        ┌─────────────────────┼─────────────────────┐

        │                     │                     │

┌───────▼───────┐    ┌────────▼────────┐    ┌──────▼───────┐

│ My Account    │    │ My Catalog      │    │ My Order     │

│ Service       │    │ Service         │    │ Service      │

│ (Port 8080)   │    │ (Port 8080)     │    │ (Port 8080)  │

└───────┬───────┘    └────────┬────────┘    └──────┬───────┘

        │                     │                    │

┌───────▼───────┐    ┌────────▼────────┐    ┌──────▼───────┐

│ PostgreSQL    │    │ Elasticsearch   │    │ PostgreSQL   │

│ Database      │    │ Search Engine   │    │ Database     │

└───────────────┘    └─────────────────┘    └──────────────┘

```



**What I Built:**

- **gRPC Communication**: High-performance inter-service communication that I implemented

- **GraphQL Gateway**: Unified API with data aggregation that I designed

- **Database per Service**: Separate data stores with technologies I chose

- **Docker Containerization**: Complete containerized deployment I configured



### 🟨 My Node.js Snippet Platform

Modern web application I created to explore TypeScript microservices:



```

                    ┌─────────────────────┐

                    │   My React Client   │

                    │  (Vite + TypeScript)│

                    └─────────┬───────────┘

                              │ HTTP/REST

        ┌─────────────────────┼─────────────────────┐

        │                     │                     │

┌───────▼───────┐    ┌────────▼────────┐    ┌──────▼───────┐

│ My Snippet    │    │ My Comments     │    │ My Future    │

│ Service       │    │ Service         │    │ Services     │

│ (Port 3000)   │    │ (Port 3001)     │    │              │

└───────┬───────┘    └────────┬────────┘    └──────────────┘

        │                     │

┌───────▼───────┐    ┌────────▼────────┐

│ In-Memory     │    │ In-Memory       │

│ Storage       │    │ Storage         │

└───────────────┘    └─────────────────┘

```



**What I Implemented:**

- **TypeScript Services**: Type-safe backend development that I practiced

- **React Frontend**: Modern UI with libraries I learned

- **RESTful APIs**: Standard HTTP-based communication I designed

- **Modular Architecture**: Clean separation of concerns I applied



## � Learning Path



### 🎓 **For Beginners** (Start Here)

**Goal**: Understand why and when to use microservices



1. **📊 [Business Requirements](./concepts/BuisinessRequirements.md)** - Learn the business drivers for microservices adoption

2. **🔄 [Architectural Evolution](./concepts/TheArchitecturalEvolution.md)** - See the complete journey from monolith to microservices

3. **👥 [Views & Perspectives](./concepts/Views.md)** - Understand how different stakeholders view microservices



### 🔧 **For Intermediate Developers**

**Goal**: Master core architectural patterns and design principles



1. **🏗️ [Hexagonal Architecture](./concepts/HexagonalArc.md)** - Learn ports and adapters pattern for clean architecture

2. **⚡ [Decomposition Strategies](./concepts/decomposition.md)** - Master techniques for breaking down monoliths

3. **🚪 [API Gateway Patterns](./concepts/APIGateways.md)** - Design effective entry points and routing



### 🚀 **For Advanced Practitioners**

**Goal**: Build resilient, event-driven distributed systems



1. **📡 [Event-Driven Architecture](./concepts/EventdrivenArchitecture.md)** - Design decoupled, reactive systems

2. **🌊 [Event Streaming](./concepts/EventStreams.md)** - Handle high-throughput data flows

3. **📈 [Scaling Microservices](./concepts/ScalingMS.md)** - Optimize for performance and reliability



### 🧠 **For Experts & Architects**

**Goal**: Navigate complex scenarios and understand trade-offs



1. **⚙️ [Advanced Concepts](./concepts/msConsiderations&Concepts.md)** - Master complex distributed system patterns

2. **⚠️ [Challenges & Solutions](./concepts/ChallengesWithMS.md)** - Navigate pitfalls and anti-patterns

3. **🏢 [Modular Monolith](./concepts/ModularMonolith.md)** - Know when NOT to use microservices



### 🛠️ **Hands-On Practice**

**Goal**: Apply concepts with real implementations



1. **🐹 [Go Implementation](./golang/README.md)** - Build production-ready gRPC microservices

2. **🟨 [Node.js Implementation](./nodejs/)** - Create modern TypeScript services

3. **🔄 Compare Approaches** - Understand different technology choices and trade-offs



## 💻 Practical Implementations



### 🐹 Go Microservices Platform



**E-commerce system with production-grade features:**



#### 🔧 Core Services

- **👤 Account Service**: User management with PostgreSQL storage

  - gRPC API for account CRUD operations

  - User authentication and validation

  - Pagination support for account listings



- **📦 Catalog Service**: Product management with Elasticsearch

  - Full-text search capabilities

  - Product CRUD operations

  - Advanced search and filtering



- **🛒 Order Service**: Order processing with PostgreSQL

  - Multi-product order creation

  - Automatic price calculation

  - Order history and tracking



- **🌐 GraphQL Gateway**: Unified API interface

  - Schema stitching across all services

  - Type-safe query resolution

  - Data aggregation and optimization



#### 🛠️ **Technology Stack**

- **Language**: Go 1.24.2

- **Communication**: gRPC with Protocol Buffers

- **API Layer**: GraphQL with gqlgen

- **Databases**: PostgreSQL + Elasticsearch

- **Containerization**: Docker & Docker Compose



#### 🚀 **Getting Started**

```bash

cd golang

docker-compose up -d

```



Access GraphQL Playground: `http://localhost:8080/graphql`



### 🟨 Node.js Microservices Platform



**Code snippet management platform with modern web stack:**



#### 🔧 Core Services



- **💬 Comments Service**: Comment system

  - Comment CRUD operations

  - Snippet-comment associations

  - User-based commenting



- **🎨 React Client**: Modern frontend application

  - React 19 with TypeScript

  - Tailwind CSS for styling

  - Radix UI components

  - Vite for fast development



#### 🛠️ **Technology Stack**

- **Backend**: Node.js + TypeScript + Express.js

- **Frontend**: React 19 + TypeScript + Vite

- **Styling**: Tailwind CSS + Radix UI

- **HTTP Client**: Axios for API communication

- **Development**: Hot reload with Nodemon



#### 🚀 **Getting Started**

```bash

# Start Snippet Service

cd nodejs/snippet

npm install && npm run dev



# Start Comments Service  

cd nodejs/comments

npm install && npm run dev



# Start React Client

cd nodejs/client

npm install && npm run dev

```



Access Frontend: `http://localhost:5173`



## 🛠️ Technologies



### 📚 Concepts & Documentation

- **Markdown**: Comprehensive documentation with diagrams

- **Visual Diagrams**: Architecture patterns and system evolution

- **Learning Modules**: Structured progression from basics to advanced topics



### 🐹 Go Implementation Stack

- **Language**: Go 1.24.2 (high-performance, concurrent programming)

- **Communication**: gRPC (HTTP/2-based RPC framework)

- **API Gateway**: GraphQL with gqlgen (type-safe API layer)

- **Databases**: 

  - PostgreSQL (ACID-compliant relational data)

  - Elasticsearch (full-text search and analytics)

- **Containerization**: Docker + Docker Compose

- **Libraries**:

  - `google.golang.org/grpc` - gRPC framework

  - `github.com/99designs/gqlgen` - GraphQL server generator

  - `github.com/lib/pq` - PostgreSQL driver  

  - `github.com/elastic/go-elasticsearch/v9` - Elasticsearch client

  - `github.com/segmentio/ksuid` - Unique ID generation



### 🟨 Node.js Implementation Stack

- **Runtime**: Node.js 18+ (JavaScript runtime)

- **Language**: TypeScript 5.8+ (type-safe JavaScript)

- **Backend Framework**: Express.js 5.x (web application framework)

- **Frontend Framework**: React 19 (component-based UI library)

- **Build Tool**: Vite (fast frontend build tool)

- **Styling**: 

  - Tailwind CSS 4.x (utility-first CSS framework)

  - Radix UI (accessible component primitives)

- **HTTP Client**: Axios (promise-based HTTP client)

- **Development Tools**:

  - ESLint (code linting)

  - Prettier (code formatting)

  - Nodemon (auto-restart development server)



## 🚀 Quick Start



### 📋 Prerequisites

- **Go**: Version 1.24.2 or higher

- **Node.js**: Version 18 or higher  

- **Docker**: Docker Desktop with Docker Compose

- **Git**: For repository cloning



### ⚡ Fast Setup (All Services)



```bash

# Clone the repository

git clone https://github.com/suryanshvermaa/microservices.git

cd microservices



# Option 1: Start Go E-commerce Platform

cd golang

docker-compose up -d

# Access GraphQL: http://localhost:8080/graphql



# Option 2: Start Node.js Snippet Platform

# Terminal 1: Snippet Service

cd nodejs/snippet

npm install && npm run dev



# Terminal 2: Comments Service  

cd nodejs/comments

npm install && npm run dev



# Terminal 3: React Client

cd nodejs/client

npm install && npm run dev

# Access Frontend: http://localhost:5173

```



### 📚 Learning-First Approach



```bash

# Start with concepts for theoretical foundation

cd concepts

# Read readme.md for complete learning path



# Then explore implementations

cd ../golang && cat README.md

cd ../nodejs && ls -la

```



### 🔧 Development Setup



```bash

# Go Development

cd golang

go mod tidy                    # Install dependencies

# Generate protobuf: protoc --go_out=. --go-grpc_out=. --proto_path=. *.proto

go run services/graphql/main.go # Run individual service



# Node.js Development  

cd nodejs/snippet

npm install                    # Install dependencies

npm run dev                    # Start development server

npm run build                  # Build for production

```



### 🌍 Environment Configuration



Create `.env` files in each service directory with appropriate configuration:



```bash

# Go Services Environment

DATABASE_URL=postgres://user:password@localhost:5432/dbname

ACCOUNT_SERVICE_URL=localhost:8080

CATALOG_SERVICE_URL=localhost:8080

ORDER_SERVICE_URL=localhost:8080



# Node.js Services Environment  

PORT=3000

NODE_ENV=development

```



## 📡 API Documentation



### 🐹 GraphQL API (Go Platform)



**Endpoint**: `http://localhost:8080/graphql`



The GraphQL gateway provides a unified interface with type-safe queries:



#### **Sample Queries**



```graphql

# Create an Account

mutation CreateAccount {

  createAccount(account: {name: "John Doe"}) {

    id

    name

  }

}



# Create a Product

mutation CreateProduct {

  createProduct(product: {

    name: "MacBook Pro M3"

    description: "High-performance laptop for developers"

    price: 2499.99

  }) {

    id

    name

    price

  }

}



# Create an Order

mutation CreateOrder {

  createOrder(order: {

    accountId: "2G8UdqGCWJ9ZCJHeLM4s1Z8DKfP"

    products: [

      { id: "2G8UeA1K5L2NxJ4QxBj8sK9DfR7", quantity: 2 }

    ]

  }) {

    id

    totalPrice

    products {

      name

      quantity

      price

    }

  }

}



# Query Accounts with Orders

query GetAccounts {

  accounts(pagination: {skip: 0, take: 10}) {

    id

    name

    orders {

      id

      totalPrice

      createdAt

      products {

        name

        quantity

      }

    }

  }

}



# Search Products

query SearchProducts {

  products(query: "MacBook", pagination: {skip: 0, take: 5}) {

    id

    name

    description

    price

  }

}

```



### 🟨 REST APIs (Node.js Platform)



#### **Snippet Service** (`http://localhost:3000`)



```bash

# Create a snippet

POST /api/v1/snippet

Content-Type: application/json

{

  "title": "React Hook Example",

  "description": "Custom hook for API calls",

  "code": "const useApi = () => { ... }",

  "userId": 1

}



# Get all snippets

GET /api/v1/snippet



# Health check

GET /health

```



#### **Comments Service** (`http://localhost:3001`)



```bash

# Create a comment

POST /api/v1/comment

Content-Type: application/json

{

  "comment": "Great snippet!",

  "userId": 1,

  "snippet_id": "abc123"

}



# Get comments by snippet ID

GET /api/v1/comment/:snippetId



# Health check

GET /health

```



#### **Frontend Client** (`http://localhost:5173`)

- Modern React application with TypeScript

- Snippet creation and viewing interface

- Responsive design with Tailwind CSS

- Real-time interaction with backend services



## 🐳 Deployment



### 📦 Containerized Deployment (Go)



```bash

# Quick start with Docker Compose

cd golang

docker-compose up -d



# Individual service builds

docker build -f services/account/app.dockerfile -t account-service .

docker build -f services/catalog/app.dockerfile -t catalog-service .

docker build -f services/order/app.dockerfile -t order-service .

docker build -f services/graphql/app.dockerfile -t graphql-gateway .



# Production deployment

docker-compose -f docker-compose.prod.yml up -d

```



### 🚀 Manual Deployment (Node.js)



```bash

# Production build

cd nodejs/snippet && npm run build

cd nodejs/comments && npm run build  

cd nodejs/client && npm run build



# Start production services

npm start  # For each service

```



### ☁️ Cloud Deployment Considerations



- **Container Orchestration**: Kubernetes, Docker Swarm

- **API Gateway**: NGINX, Kong, AWS API Gateway

- **Database**: Managed PostgreSQL, Elasticsearch Service  

- **Monitoring**: Prometheus, Grafana, ELK Stack

- **Security**: HTTPS, JWT authentication, service mesh



## 📚 Comprehensive Learning Resources



### 🎓 **Complete Course Structure** (`/concepts`)



The theoretical foundation provides a complete microservices education:



#### **🏗️ Module 1: Foundations & Evolution**

- **[Architectural Evolution](./concepts/TheArchitecturalEvolution.md)** - Journey from monoliths to microservices

- **[Business Requirements](./concepts/BuisinessRequirements.md)** - When and why to adopt microservices

- **[Stakeholder Views](./concepts/Views.md)** - Different perspectives on microservices architecture



#### **🔧 Module 2: Core Architectural Patterns**  

- **[Hexagonal Architecture](./concepts/HexagonalArc.md)** - Ports and adapters for clean architecture

- **[API Gateway Evolution](./concepts/APIGateways.md)** - From centralized to distributed gateways

- **[Decomposition Strategies](./concepts/decomposition.md)** - Breaking down monoliths effectively



#### **🔄 Module 3: Communication & Integration**

- **[Inter-Service Communication](./concepts/images/IntercommunicationService.md)** - Synchronous to event-driven evolution

- **[Event-Driven Architecture](./concepts/EventdrivenArchitecture.md)** - Design principles and best practices

- **[Event Streaming](./concepts/EventStreams.md)** - High-throughput data platforms

- **[Event Processing](./concepts/EventProcessing.md)** - Real-time vs batch processing



#### **📊 Module 4: Advanced Patterns & Scaling**

- **[Scaling Microservices](./concepts/ScalingMS.md)** - Performance and reliability optimization

- **[Message Queues](./concepts/Queues.md)** - Asynchronous messaging patterns

- **[Queues vs Streams](./concepts/images/QueueVSStreams.md)** - Choosing the right approach



#### **⚖️ Module 5: Challenges & Alternatives**

- **[Challenges with Microservices](./concepts/ChallengesWithMS.md)** - Common pitfalls and solutions

- **[Modular Monolith](./concepts/ModularMonolith.md)** - When simpler approaches are better

- **[EDA Key Takeaways](./concepts/EDATakeways.md)** - Event-driven architecture summary

- **[Advanced Concepts](./concepts/msConsiderations&Concepts.md)** - Complex scenarios and patterns



### 🛠️ **Key Concepts Covered**



**Architectural Patterns:**

- Hexagonal Architecture (Ports & Adapters)

- API Gateway Evolution

- Database per Service

- Strangler Fig Pattern

- Event Sourcing



**Communication Patterns:**

- Synchronous vs. Asynchronous

- Request-Response vs. Event-Driven

- Publish-Subscribe

- Message Queues vs. Event Streams



**Scaling Strategies:**

- Horizontal vs. Vertical Scaling

- Partitioning and Sharding

- Consumer Groups

- Backpressure Handling

- Service Discovery



**Operational Concerns:**

- Distributed Tracing

- Centralized Logging

- Circuit Breakers

- Retry Mechanisms

- Idempotent Processing



## 🎯 What I Learned



This personal project has been instrumental in deepening my understanding of distributed systems:



### 👨‍� **Technical Skills I Developed**

- **Go Programming**: Advanced concurrent programming and gRPC implementation

- **TypeScript/Node.js**: Modern backend development with type safety

- **React Development**: Component-based UI development with modern tooling

- **Database Design**: Polyglot persistence with PostgreSQL and Elasticsearch

- **Container Orchestration**: Docker and Docker Compose for microservices deployment



### �️ **Architectural Patterns I Mastered**

- **Hexagonal Architecture**: Clean separation of business logic from infrastructure

- **Event-Driven Design**: Asynchronous communication patterns and event streaming

- **API Gateway Patterns**: Unified interfaces and cross-cutting concerns

- **Database per Service**: Data ownership and consistency patterns

- **gRPC Communication**: High-performance inter-service communication



### � **Concepts I Internalized**

- **When to use microservices** vs simpler alternatives like modular monoliths

- **Trade-offs** between different architectural approaches

- **Scaling strategies** for distributed systems

- **Operational complexity** of microservices and mitigation strategies

- **Business alignment** of technical architecture decisions



### � **Personal Development Goals Achieved**

- Built production-ready microservices from scratch

- Created comprehensive documentation for complex systems

- Learned to balance theoretical knowledge with practical implementation

- Developed skills in multiple programming languages and frameworks

- Gained experience with modern development and deployment tools



## 🤝 About This Repository



This is my personal learning project, created to explore microservices architecture comprehensively. While it's designed for my own education and reference, others are welcome to:



### � **Study My Work**

- Review my concept notes and learning materials

- Examine my implementations and architectural decisions

- Use my documentation as a reference for your own projects



### 💻 **Run My Projects**

- Try out my Go e-commerce platform

- Experiment with my Node.js snippet management system

- Test different scenarios and configurations



### 🔄 **Build Upon My Work**

- Fork the repository for your own learning

- Extend my implementations with additional features

- Create your own microservices based on my patterns



### 🙏 **Acknowledgments for My Learning**

- **Martin Fowler & Sam Newman**: For foundational microservices concepts

- **Go Community**: For excellent tooling and libraries

- **React & TypeScript Teams**: For modern development experiences

- **Open Source Contributors**: For the amazing tools I used throughout this journey



## 📄 License



This project is licensed under the **MIT License** - see the [LICENSE](LICENSE) file for details.



### 📜 **What this means:**

- ✅ **Commercial use** - Use in commercial projects

- ✅ **Modification** - Adapt and modify the code

- ✅ **Distribution** - Share and redistribute

- ✅ **Private use** - Use for personal projects

- ❗ **Include license** - Include original license in copies



## 🙏 Acknowledgments



### 🌟 **Community & Contributors**

- **Open Source Community**: For the incredible tools and libraries

- **Microservices Pioneers**: Martin Fowler, Sam Newman, and other thought leaders

- **Go Community**: For excellent concurrent programming patterns

- **Node.js Ecosystem**: For rapid development capabilities

- **React Team**: For modern frontend development patterns



### 📚 **Educational Resources**

- **Building Microservices** by Sam Newman

- **Microservices Patterns** by Chris Richardson  

- **Designing Data-Intensive Applications** by Martin Kleppmann

- **Go Concurrency Patterns** and **Node.js Best Practices**



## 📞 Support & Community



### 🆘 **Getting Help**

- **📖 Documentation**: Start with the [concepts guide](./concepts/readme.md)

- **🐛 Issues**: Report bugs on [GitHub Issues](https://github.com/suryanshvermaa/microservices/issues)

- **💬 Discussions**: Join conversations on GitHub Discussions

- **📧 Direct Contact**: Reach out for collaboration opportunities



### 🎯 **Next Steps**

1. **🚀 Start Learning**: Begin with [Business Requirements](./concepts/BuisinessRequirements.md)

2. **🛠️ Get Hands-On**: Try the [Go Implementation](./golang/README.md)

3. **🎨 Build UIs**: Explore the [Node.js Platform](./nodejs/)

4. **🤝 Contribute**: Share your improvements and learnings



---



**🌟 Star this repository if it helped you learn microservices architecture!**



> *"The best way to learn microservices is to build them. The best way to master them is to understand when not to use them."*