After an HR call where they explain everything, you can expect five rounds of interviews:

• Initial screening: Generally a 30-minute phone interview taken by a manager, discussing your experiences, agile processes, and some technical questions. If they like you, they will try to sell Workday.
• Tech test: A 60-minute technical test, asking you to build a UML diagram for a given problem. Depending on the role, they may expect more. This is taken by two application developers (paired up).
• Demo of xpresso: An application developer will show how to write code in xpresso.
• QA interview: A QA Manager will talk about testing approaches, Unit Testing vs. System Testing, agile processes, etc.
• Architecture interview: A senior software engineer will go through your project architecture, ask some object modeling questions, and some OOP concepts.
• Cultural: Generally taken by a manager (or above) to check if the candidate fits culturally. This includes assessing if you are open-minded, interested in Workday and xpresso, have a solution-oriented mindset, an ability to learn, and are a team player.

Here are some potential interview topics:

• What is continuous integration?
• Basic questions on ERP?
• UML diagram for ordering an item from Amazon
• Why Workday?
• What kind of processes do you follow? (and follow-up questions on explaining those)

In short, don't worry; their interview process is very easy. If you pass the tech test, you can be sure. The rest of the interviews are easy if you are a good storyteller.