Senior Firmware Engineer

About this role

Hire Resolve is a South African security communications company. It designs, makes and supports GSM/LTE communicators, alarm panels and related software. This Durban-based role is for a hands-on engineer who will look after embedded firmware from design through to maintenance.

What you’ll do

• Design, build and maintain firmware in C/C++ for small, resource-limited ARM Cortex-M microcontrollers.
• Develop and tune communication drivers and stacks, including GSM/LTE, UART, SPI and I2C, so alarm signals and two-way messages stay reliable.
• Work with software teams on over-the-air (OTA) updates, cloud back-end links and device provisioning.
• Support board bring-up, schematic reviews, debugging and design-for-manufacture work with the hardware team.
• Build in diagnostics, logging, watchdog timers, error recovery and low-power features.
• Run unit, field and production tests, and do root-cause analysis on complex faults in the field.
• Lead code reviews, set coding standards, keep technical documents up to date and mentor junior engineers.
• Make sure your work meets South African regulatory rules from ICASA and follows security protocols.

What you need

• 8 or more years of professional embedded firmware or software development experience.
• Strong C/C++ skills on ARM Cortex-M microcontrollers, or similar devices.
• Proven experience with an RTOS (such as FreeRTOS) or bare-metal development.
• Deep hands-on experience with cellular modems (GSM, 2G, 3G, LTE), AT command sets and RF communication.
• Experience with UART, SPI, I2C and DMA peripherals.
• Hands-on use of hardware debugging tools such as JTAG/SWD, logic analysers and oscilloscopes.
• Working knowledge of Git, CI/CD pipelines and structured build systems.
• A B.Sc. or B.Eng. in Electronic/Electrical Engineering, Computer Engineering or Computer Science, or equivalent practical experience.
• Advantageous: background in alarm panels, telemetry or security products, including Contact ID protocols.
• Advantageous: experience designing secure OTA update systems and low-power or battery-backed devices.
• Advantageous: Python scripting for automated testing and tools.
• Advantageous: familiarity with ICASA radio compliance and regulatory processes.

Is this job for you?

This role suits an experienced embedded engineer who enjoys hands-on work on real devices. You should be comfortable leading others and taking ownership of a product from design to field support.

Tips before you apply

• Have your degree certificate and a detailed record of your 8+ years of embedded work ready to share.
• On your CV, name the microcontrollers, RTOS, modems and debugging tools you have used, and describe a field fault you solved.
• Show your mentoring and code review experience with clear examples, such as standards you set or engineers you guided.

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