SOLID Principles Course
Learn SOLID principles through hands-on design of extensible subscription and payment systems, focusing on domain modeling, payment flows, notifications, and safe extensions.

from 4 to 360h flexible workload
valid certificate in your country
What will I learn?
This SOLID Principles Course teaches you how to design clean, extensible subscription and payment systems using real-world patterns. You will learn domain modeling for users, subscriptions, and invoices, robust payment flows, and flexible notification channels. Practice abstractions, dependency injection, testing strategies, and safe extension techniques to add new payment methods and channels without breaking existing code.
Elevify advantages
Develop skills
- Model subscription lifecycles: design clear states for billing and access control.
- Architect payment flows: build SOLID, testable adapters for cards, PayPal, and more.
- Design pluggable notifications: add email, SMS, and push without core rewrites.
- Apply SOLID in practice: cut coupling, boost cohesion in real backend modules.
- Extend safely: add payment methods and channels using OCP and DIP patterns.
Suggested summary
Before starting, you can change the chapters and workload. Choose which chapter to start with. Add or remove chapters. Increase or decrease the course workloadWhat our students say
Your classes are perfect. I got the one-year package and finally have the chance to follow several topics I'm interested in without having to switch platforms... thank you for everything you do, I've already recommended you to others...

Giulio CarloDigital Marketing Student
I like how the lessons get straight to the point and how I can switch chapters and skip content I don't need.

Mariana FerresPhotography Student
I like the content and the way the videos are presented and transcribed, which speeds up the process!

Luciana AlvarengaNail Design Student
The platform is fast and easy to use. The variety of content and the extra videos really help with learning.

Giulio CarloPrompt Engineering Student
FAQ
Who is Elevify? How does it work?
Do the courses have certificates?
Are the courses free?
What is the course workload?
What are the courses like?
How do the courses work?
What is the duration of the courses?
What is the cost or price of the courses?
What is an EAD or online course and how does it work?
PDF Course