I applied online.
Initial recruiter phone screen, then a hiring manager screen, then 4 full technical interview rounds. The recruiter phone screen and the hiring manager screen are high-level research fit. Each of the 4 rounds was technical, focusing on machine learning concepts from different areas.
One example is explaining contrastive loss.
A bunch of other ML questions, spanning transformers and computer vision.
The following metrics were computed from 3 interview experiences for the Apple Machine Learning Researcher role.
Apple's interview process for their Machine Learning Researcher roles is extremely selective, failing the vast majority of engineers.
Candidates reported having very negative feelings for Apple's Machine Learning Researcher interview process.