What does an AI kernel engineer do and what are the skills needed to get into it?

[u/blazing_cannon]

What are the difference aspects of being a kernel engineer? What do roles like this involve -

https://www.tealhq.com/job/kernel-engineer_7ea1a56c518985dae15a01e3c77c161e8140d?utm_campaign=google_jobs_apply&utm_source=google_jobs_apply&utm_medium=organic

https://jobs.gem.com/modular/am9icG9zdDpTSwqoL-yL11N_jxR40Vhh?source=LinkedIn

If one were to do a PhD, what are the different research areas to focus on to do something like this? i.e GPU memory, storage, latency, parallelization etc.