Embedded Firmware Engineer

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Skills you'll use

What you'll do

• Design, develop and maintain embedded firmware in C for STM32 (Cortex-M0+/M3/M4) based instruments, from bare-metal register-level drivers up to FreeRTOS application tasks.
• Develop and optimise low-level peripheral drivers — UART, I2C, SPI, ADC, DMA, timers, RTC, GPIO, PWM, low-power modes — with and without HAL/LL layers.
• Architect and implement FreeRTOS-based applications: task decomposition, priority assignment, queues, semaphores, mutexes, event groups, stack sizing, and diagnosis of priority inversion, race conditions and stack overflow.
• Write and maintain custom bootloader code — memory partitioning and linker scripts, dual-bank / A-B image schemes, image validation with CRC and digital signatures, rollback and fail-safe recovery.
• Implement secure and encrypted firmware update paths (OTA and wired), including AES-encrypted image delivery, signature verification and anti-rollback protection.
• Implement firmware protection and anti-tamper measures: STM32 Read-Out Protection (RDP), write protection, proprietary code readout protection (PCROP), secure boot / root of trust, debug port lockdown and key storage strategy.
• Integrate and characterise sensors and peripherals — electrochemical, catalytic, IR/TDLAS gas sensors, displays, flash memory, Bluetooth Low Energy and GPS modules.
• Support power optimisation and battery life targets for portable, field-deployed instruments.
• Debug at hardware level using oscilloscopes, logic analysers, multimeters and JTAG/SWD debuggers; work directly with hardware engineers on board bring-up and design reviews.
• Write unit and integration tests, participate in code reviews, and maintain firmware under version control with a disciplined branching and release process.

Who can apply

• · Bachelor's or Master's degree in Electronics, Electronics & Communication, Instrumentation, Computer Engineering or a related discipline.

About Halma

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