Open Source and Digitalisation

• PHP
• PHPUnit
• Open Source
• Open Source Program Office
• The PHP Foundation

Testing and Quality Assurance

• Test Automation
• Test-Driven Development
• PHPUnit
• Development Tools

Architecture and Modelling

• Event Storming
• CQRS
• Event Sourcing
• Software Architecture
• Domain-Driven Design

Object-Orientation and Design Patterns

• Design Patterns
• Test-Driven Development
• Type Safety
• Event Sourcing

Clean Code and Sustainability

• SOLID
• Clean Code

Refactoring and Modernisation

• Refactoring
• Characterization Tests