Extreme Programming (XP) Roles

1. Coach

• Equivalent to Scrum Master in Scrum.
• Acts as a mentor, guiding the XP process.
• Facilitates the team to improve efficiency.
• Ensures best XP practices are followed.

Example: The coach helps the team implement Test-Driven Development (TDD) and pair programming effectively.

2. Customer

• Represents the business side of the project.
• Provides project requirements and priorities.
• Ensures that the team is aligned with business goals.

Example: The customer defines a new feature and prioritizes it over others based on market needs.

3. Programmers

• Also known as the Agile project team.
• Responsible for writing and maintaining the code.
• Work in pairs to ensure high code quality.

Example: Two developers pair-program to implement a new API endpoint following XP principles.

4. Testers

• Help customers define and write acceptance tests.
• Ensure that all functionalities meet the predefined criteria.
• Work closely with programmers to automate tests.

Example: The tester creates automated test cases to validate that a shopping cart feature meets customer requirements.