Overall, the interview process was fairly standard until it hit the "onsite" portion. For reference, this all happened remotely while COVID was happening, so their policies and procedures are hopefully different when done in person.
Stage one of the interview process was a brief presentation of one of my design projects with a designer from Lutron. It went smoothly, the designer asked some questions, very standard, took about an hour in total.
The next stage, a 3 hour, remote, "onsite," is where the process got rather strange. The company emailed me a week in advance, telling me to create a prototype and presentation based on the prompt, "How might we design the future of a connected-home experience."
The "onsite" also included a one hour, remote, white board challenge that involved role play. The role play aspect honestly ended up being really strange to attempt remotely, but maybe it's less awkward in person?
I also feel the need to point out that, unlike other design challenges I have executed (many with far larger companies), Lutron felt the need to make their design and whiteboard challenges focus on the work they actually do (designing lighting and lighting controls). This made me feel as if I was completing free work for them, and added questions and constraints that wouldn't have been involved with unrelated topics. Additionally, having the topic be something the company is already researching means that the designers will have a plethora of research and ideation on the topic already.