We haven't detailed them out yet, but here's the job description we had up for a Raid Designer:
"Are you experienced in building challenging cooperative gameplay experiences? Do you have fond memories of the first time you killed Ragnaros? Can you build encounters that require planning, demand coordination, and reward execution? Do you understand combat spaces and the ways players will utilize them to avoid otherwise certain death?
Bungie is seeking talented, passionate designers to build experiences that will challenge players' thumbs, minds, and communication skills.
As a Raid Designer you will work with Designers, Artists, Engineers, and Producers to create memorable, bond-building encounters that players will scour YouTube to defeat."