ALSA, ADSP, Routing, Tuning, Android Audio Framework, HAL, Linux Kernel Drivers, AMS, MDF, GEF Effectsm Audio CarPlay/Android Auto, SVA, TDM, I2S
Video FWK, Android Video, Accelerator, V4L2, Video Kernel Driver
Good Knowledge of any of Video Codecs like MPEG2/4/H264/H265/VP8/VP9/AV1.

Embedded Android, Android FWK/Native (Android Arch - AIDL/HIDL, Treble. xTS), HAL, Linux Kernel Device Driver

Android Build system, Soong, BAZEL;

System Feature - Boot Optimizations, Early Services (RVC, Audio etc.,), Power & Thermal Feature Enablement, System Stability (Triage Tombstones/ANRs/FWR)