Embedded Firmware Engineer — Cortex-M, CAN/Modbus

ERNI in Spain seeks an Embedded Firmware Engineer to design, develop and maintain bare‑metal firmware for ARM Cortex‑M MCUs, mainly STM32. You will connect sensors and host systems using CAN, Modbus, UART, I²C and SPI, contributing to hardware decisions and test‑driven development. The role sits at the electronics/software intersection with a hybrid office model. English fluency is required; German is a plus. Prior STM32CubeIDE/HAL/LL experience is beneficial. J-18808-Ljbffr