Senior Developer (Remote)

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!

Based on this conviction, Principal33 aligns its strategy around its vision : to become a leading IT service company and a better working-life balance. 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.

Valencia, Spain (Hybrid – 3 days in office, 2 days remote)

Use and adapt open-source libraries to meet drone and hardware needs

Proficiency in embedded C / C++ development (bare-metal and RTOS-based)

Experience developing unit and integration tests for embedded code

Familiarity with PX4, ArduPilot, 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

Flexible work hours

Private medical insurance (Spain and Romania)

Office 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 well

Summer party!

(Continuous 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.