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Building a Collaborative Space for Low-Level Design Patterns

A hands-on repository for learning Low-Level Design patterns with Java implementations and UML diagrams

About two year ago, I started a small side project called LLD Design Patterns. Back then, it was mostly for my own learning I wanted to understand how different Low-Level Design (LLD) patterns worked under the hood and how they looked in real code, not just theory.

Fast forward a year, and it’s turned into a neat little repository of patterns — each in its own folder, complete with Java implementations and UML diagrams to visualize how the classes interact.

It’s been fun watching it grow and realizing how much structure and clarity these patterns bring to everyday development.

Why I Built It

When learning design patterns, I always found it hard to connect the dots between the concept and its implementation. Most resources either stayed too theoretical, or jumped straight into complex frameworks.

So, I wanted something simpler — a hands-on reference where each pattern lived in its own folder, explained clearly, and could be understood in a few minutes.

That’s how LLD Design Patterns came to life.

What’s Inside the Repo

The repo now includes folders for most of the popular design patterns:

  • Creational Patterns — Factory Method, Abstract Factory, Builder, Prototype, Singleton, Simple Factory
  • Structural Patterns — Adapter, Bridge, Composite, Decorator, Facade, Proxy
  • Behavioral Patterns — Chain of Responsibility, Command, Iterator, Observer, Strategy, Template

Each pattern has:

  • A clean, Java-based example
  • A matching UML diagram (in the uml_diagrams directory)
  • And simple comments explaining how the pattern works

Opening It Up to the Community

Now that it’s been 1.5 year, I’d love to open it up and make it more collaborative.

If you enjoy exploring design patterns, visualizing code with UMLs, or just want to contribute to something clean and educational — this might be a good place to start.

You can:

  • Add new pattern implementations in other languages
  • Improve or refactor existing ones
  • Create more UML diagrams
  • Or just open a discussion or issue to suggest improvements

The goal is simple:

Build a shared space where developers can learn and explore design patterns — visually and practically.

🚀 How to Contribute

If this sounds interesting, here’s how you can jump in:

  1. Star the repo
  2. Fork it and pick a pattern or language
  3. Add your code or diagram
  4. Open a pull request — and your name will be in the contributors list 🙌

📍 GitHub Repo: github.com/AkshatJMe/LLD-Design-Patterns

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