BIOS Developer:

Linux kernel/system -
1. System power/performance management
2. System firmware related - kernel ACPI driver, error reporting (edac, aer driver, etc)
3. Network architecture & driver
4. Storage architecture and driver (NVMe,...)

UEFI -
1. Capable of developing edk modules and functions based on industrial/chip vendor specification or datasheets
2. Willing to deep dive into domain technologies, like, CPU architecture, Memory (DDR or SCM),
PCIe, security, RAS (Reliability, Availability, Serviceability), networking.