Docker Microservices Demo with Cross-Language Containers

From Local Development to Docker - A Cross-Language Technical Roadmap

By the end of this guide, you'll understand how to:

Build a microservices application using multiple programming languages

Run C# (.NET), Python (Flask), and Node.js (Express) services independently

Convert applications into Docker images

Use a Docker network so containers can communicate by service name

Understand how containers isolate file systems, networking, and runtime environments

Use docker build , docker run , and docker network commands

Build a basic frontend that communicates with backend services

Prerequisites

Foundational Knowledge

Basic understanding of C#, Python, and JavaScript/Node.js

Familiarity with command line/terminal

Basic understanding of APIs and HTTP requests

Software Required

Docker Desktop installed and running

.NET 8 SDK (Optional)

Python 3.12+ (Optional)

Node.js 22+ (Optional)

Google Chrome or any browser

Text editor (VS Code…