Embedded developer

At Principal33 we strive to make happiness at work a reality. Because it's not just about the money, it's also about the work environment and appreciation. It's about creating the best team setup you can imagine and getting involved in the things you're passionate about. And you can be a part of it, because it's fun to get things done!We want our employees to innovate and we allow them to do what they are truly passionate about. Based on this conviction, Principal33 aligns its strategy around its vision : to become a leading IT service company and a better working-life balance. With currently around 200 employees from different countries, we are actively shaping the future of work.Join our cutting-edge team, a fast-growing defense tech startup redefining the future of autonomous UAV platforms. We’re looking for an experienced and passionate Senior C / C++ Embedded Developer to help build the next generation of real-time drone control systems as part of our Firmware Team. You’ll contribute directly to the firmware stack that powers our UAVs—developing modules for sensor integration, motor control, navigation, and communication with the ground station. Your work will play a vital role in flight performance, safety, and mission reliability. Location : Valencia, Spain (Hybrid – 3 days in office, 2 days remote) Your responsabilitiesContribute to flight controller firmware and onboard real-time systems Interface with sensors (IMUs, GPS), actuators (motors, servos), and communication peripherals (SPI, I2 C, UART) Implement and extend communication protocols (MAVLink and custom) Collaborate with hardware teams on board bring-up and debugging Use and adapt open-source libraries to meet drone and hardware needsTo fit this position we look forProficiency in embedded C / C++ development (bare-metal and RTOS-based) Experience with STM32, NXP, or similar MCU families Familiarity with oscilloscopes, logic analyzers, and JTAG / SWD debuggers Experience developing unit and integration tests for embedded code Nice to have : Experience with Nuttx, Free RTOS, or similar RTOS platforms Familiarity with PX4, Ardu Pilot, or other popular drone software Knowledge of sensor drivers, signal processing, sensor fusion, or control theory Background in aviation, automotive, robotics, or mission control systems Previous experience developing and debugging in WSL or Ubuntu What we offerBenefitsFlexible work hoursPrivate medical insurance (Spain and Romania)Day off on your birthdayReferral bonus if you bring your contactsGifts for special occasionsOffice that takes care of your well-being and on top of all we are pet friendly, bring your pet to the office!Fridge full of snacks at the office, healthy ones and not so healthy as wellInternational and multicultural environmentEventsSummer party!(Self)-DevelopmentContinuous training, we will help you improve your technical skills, evolve in the tech community and develop as a professional.We are an active part of the tech-community. You may have the opportunity to attend and participate in local and international tech-events.Wanna join!?