Tell me about your experience developing a framework from scratch: architecture, patterns, tools

When developing a framework from scratch, I usually start by defining an architectural style that ensures scalability and ease of maintenance. I most often choose a modular architecture with clear separation of responsibilities.

I use design patterns such as:

• Factory for creating objects without tight coupling to specific classes.
• Strategy for flexible algorithm swapping.
• Decorator for extending functionality without modifying the code.

Tools depend on the language and goals, but typically include:

• Build systems (e.g., Maven, Gradle, npm).
• Testing tools (JUnit, pytest).
• CI/CD for automation of build and testing.

Example: when creating a testing framework, I implemented the core with interfaces for test scenarios, used the Command pattern to encapsulate test actions, and enabled extension through plugins.