Job Summary
Responsibilities:
Design, develop and maintain embedded firmware in C / C++ for microcontroller-based devices
Develop and optimise communication drivers, protocols and interfaces for cellular connectivity and embedded peripherals
Ensure firmware meets reliability, security and power-efficiency requirements
Collaborate with hardware and software teams on product development, integration, testing and improvements
Implement diagnostics, error handling and recovery mechanisms
Contribute to firmware architecture, coding standards, code reviews and technical documentation
Conduct software testing, support production processes and troubleshoot complex field issues
Keep up to date with cellular technologies, embedded security and relevant regulatory requirements
Provide technical guidance to junior engineers and improve development processes
Requirements:
Minimum 8 years’ embedded firmware / software development experience
Strong C and C++ skills, preferably with ARM Cortex-M or similar microcontrollers
Experience with RTOS environments such as FreeRTOS or bare-metal development
Knowledge of GSM / LTE modules, AT commands and wireless communications
Understanding of embedded peripherals and interfaces, including UART, SPI, I2C, ADC, GPIO and DMA
Experience with Git, debugging tools, build systems and software testing
Proven ability to develop reliable, production-ready firmware for deployed devices
Strong analytical, problem-solving and communication skills
Relevant degree or equivalent practical experience
Advantageous:
Experience in security, alarm systems, IoT, telemetry or industrial communications
Knowledge of alarm signalling protocols, such as Contact ID
Experience with OTA firmware updates, device management or low-power design
Exposure to hardware development, PCB testing and ICASA compliance requirements
Python scripting for test automation
Previous technical leadership or mentoring experience
If you are passionate about embedded technology and enjoy tackling complex engineering challenges, this is an excellent opportunity to contribute to the development of innovative, reliable products.
Apply: recruiter@sandicrowther.co.za