You need something that demonstrates that you can code - not just PyTorch and ML-specific code but general software development - creating and deploying an API, using a database, being comfortable with cloud tools etc.
That + having a math PhD is enough to get interviews, the rest is interview prep which can be company dependent but it's usually basic ML knowledge + a coding test.
That + having a math PhD is enough to get interviews, the rest is interview prep which can be company dependent but it's usually basic ML knowledge + a coding test.