SOLID Principles Course
Master SOLID principles through hands-on design of extensible subscription and payment systems, focusing on domain modeling, payment adapters, 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 to design clean, extensible subscription and payment systems using real-world patterns. Learn domain modelling for users, subscriptions, and invoices, robust payment flows, and flexible notification channels. You will practise 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 the workload. Choose which chapter to start with. Add or remove chapters. Increase or decrease the course workload.What our students say
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