The interview happened in three steps:

• A take-home project focused on overall engineering practice, including code, tests, documentation, environment setup, and so on.
• A phone interview where an Opower engineer who had reviewed my project asked me questions about my choices.
• An on-site interview that consisted of seven different interviews with different teammates, including lunch with potential teammates.

These included, not in order:

• A standard coding question in Java.
• A query construction question on a whiteboard in SQL.
• A code review question where I looked at some code to identify potential improvements and possible bugs.
• A systems design question.
• A unit testing question with a QA engineer.
• A career discussion with a leader of the engineering org.
• Lunch with two members of the Engineering team.