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.

Key Responsibilities

Firmware Development:

• Design, develop, and maintain embedded firmware for IoT devices using C and C++.

• Program microcontrollers from Texas Instruments and ESP32.

• 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.

Qualifications

Essential:

• 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.

Preferred / Nice to Have:

• Experience with OTA firmware updates in production devices.

• Knowledge of IoT cloud platforms, particularly ThingsBoard.

• 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.

What We Offer

• 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.