First part was a video call with a director of engineering to discuss the role, my background, and provide an overview of the company.
Next step was a take-home task -- a simplified version of the product I'd potentially be working on. Judging by some other Glassdoor reviews, some candidates have responded poorly to this exercise. I take their point that it represents a significant time investment and it's probably true that this particular exercise approached the upper bound on what's reasonable to expect from a candidate. But I personally found it refreshing to be able to demonstrate my skills outside of the stresses of the tech interview loop.
Finally there was a day of on-site interviews - three of them technical, plus a final interview with a directory of engineering. The on-site included lunch with my potential colleagues, which was a nice touch. It seemed to me that the company had put some thought into creating a welcoming experience for candidates, and everyone I met everyone seemed genuine and genuinely friendly.