After attending this talk, participants will be able to apply a practical defense-in-depth security framework to harden their own Yocto-based Embedded Linux platforms for IoMT or other critical connected devices. They will leave with actionable steps and patterns to implement secure boot, OS-level hardening, runtime protections, secure OTA updates, and zero-trust communication — enabling them to build more secure, auditable, and regulatory-compliant devices faster while reducing security risks in production environments.