Firmware Engineer

Role Description

Energiot is seeking a motivated Firmware Engineer to join our growing product and R&D team in Barcelona. The role focuses on the development of embedded firmware for IoT devices used in electrical grid monitoring and smart energy applications. You will work hands-on with low-power microcontrollers, wireless communication technologies, and real-world sensor systems, contributing directly to production-ready devices deployed in the field.

This position is ideal for engineers with a solid foundation in embedded systems who want to grow in a multidisciplinary environment combining firmware, hardware, and cloud connected IoT platforms.

• Design, develop, and maintain embedded firmware for IoT devices using C and C++.
• Program microcontrollers from Texas Instruments and ESP
  32.
• Manage peripheral drivers (I2C, SPI, ADC, UART, GPIO, timers).
• Integrate and manage a wide range of sensors and low-power components.
• Develop and maintain wireless communication stacks for IoT devices (LoRaWAN, NB-IoT, BLE).
• Implement wired communication protocols such as UART, RS485, and USB.
• Work with bootloaders and support firmware updates, including OTA mechanisms.
• Write unit tests for embedded firmware using frameworks such as Unity.
• Support integration and testing with cloud IoT platforms.
• Collaborate closely with hardware, backend, and product teams.

• Bachelor’s or Master’s degree in Computer Science, Electronic Engineering, Telecommunication Engineering, or a related field.
• Minimum 2–3 years of experience in embedded firmware development.
• Strong programming skills in C and C++ for microcontrollers.
• Experience working with microcontroller peripherals (I2C, SPI, ADC, UART).
• Knowledge of wireless communication protocols for IoT and sensor networks (LoRaWAN, NB-IoT, BLE).
• Experience with FreeRTOS or similar real-time operating systems.
• Familiarity with Git and version control workflows.
• Understanding of bootloaders and firmware update mechanisms.
• Basic knowledge of cybersecurity concepts applied to embedded systems.
• Fluency in Spanish and English.
• Proactive, structured, and problem-solving mindset.

• Experience with OTA firmware updates in production devices.
• Knowledge of IoT cloud platforms, particularly Things Board.
• Basic Python skills for scripting, testing, or tooling.
• Experience using API testing tools such as Postman.
• Familiarity with Qt / Qt Creator and C++ for building simple user interfaces.
• Experience working in low-power or energy-constrained systems.
• Exposure to CI/CD pipelines for embedded or IoT projects.

• Full-time, permanent contract.
• Competitive salary based on experience.
• Flexible working hours and partial remote work.
• Opportunity to work on real, production-level IoT devices deployed in the energy sector.
• High level of ownership and technical responsibility.
• Collaborative, engineering-driven culture in a fast-growing startup.
• Office located in Barcelona, with a strong focus on innovation and sustainability.