Senior Embedded Firmware Engineer (ESP32 & STM32)

About the Role

We are seeking a Senior Embedded Firmware Engineer to design and develop firmware for our IoT devices and edge computing products. You will work with ESP32 and STM32 microcontrollers, focusing on low-power design, secure communication, and robust protocol implementations. This role requires hands-on embedded development expertise, a strong understanding of hardware/software integration, and the ability to deliver production-ready firmware for mission-critical systems.

Responsibilities

• Develop and maintain firmware for ESP32 (ESP-IDF) and STM32 (CubeMX, CubeIDE, HAL/LL drivers).
• Implement and optimize RTOS-based applications using FreeRTOS (tasks, queues, timers, synchronization).
• Design and test low-power strategies (deep sleep, RTC, watchdogs) for solar/battery-powered devices.
• Integrate and manage sensors and actuators via UART, SPI, I2C, ADC/DAC, GPIO.
• Implement and maintain wireless communication stacks (LoRa, Wi-Fi, BLE).
• Develop OTA firmware update pipelines, bootloaders, and secure firmware upgrade processes.
• Apply signal processing techniques for accurate and reliable sensor data handling.
• Perform debugging and validation using JTAG/SWD, oscilloscopes, and logic analyzers.
• Collaborate with hardware engineers on PCB bring-up and hardware/software integration.
• Document designs, implementation details, and contribute to protocol specifications.

Requirements

• 4+ years in embedded firmware development with C/C++.
• Strong expertise with ESP32 (ESP-IDF) and STM32 (CubeMX, CubeIDE, HAL/LL).
• Practical experience with FreeRTOS (multi-tasking, resource sharing, synchronization).
• Deep understanding of sleep modes, RTC integration, and watchdogs.
• Proficiency with communication protocols UART, SPI, I2C, ADC/DAC, GPIO, LoRa, Wi-Fi, BLE.
• Knowledge of OTA updates, bootloaders, secure flashing, and cryptographic practices.
• Familiarity with basic DSP techniques for sensor data filtering and calibration.
• Strong experience with JTAG/SWD, oscilloscopes, and logic/protocol analyzers.

Nice to Have

• Experience with custom RF stacks, multi-hop protocols, or proprietary networking protocols.
• Familiarity with MATLAB/Python for data analysis and prototyping.
• Contributions to open-source embedded or IoT projects.
• Experience in rugged IoT deployments (harsh environments, desert, remote sites).