Embedded Software Engineer III - PX4 Firmware & Simulation

At Zone 5 Technologies, we're redefining what's possible in unmanned aircraft systems. Our team of engineers and innovators is developing cutting-edge autonomous solutions that push the boundaries of UAS technology - solving complex challenges that matter. We're building the future of UAS capabilities, and we're looking for exceptional talent to join us. If you're driven by hard problems, energized by rapid innovation, and ready to make an impact on next-generation flight systems, you belong here. We are seeking an Embedded Software Engineer to develop and maintain custom PX4 autopilot firmware for autonomous aerial platforms. You will modify core flight control algorithms, integrate custom sensors and payloads, build simulation environments for hardware-in-the-loop testing, and ensure reliable operation in challenging mission profiles. **Responsibilities:** **PX4 Firmware Development & Customization** • Develop, modify, and maintain custom PX4 firmware modules for mission-specific requirements • Implement custom flight modes, navigation algorithms, and control strategies • Integrate sensors, actuators, and payloads through PX4 driver and uORB message framework • Debug firmware issues using GDB, serial consoles, and flight log analysis • Patch and backport fixes across PX4 versions while maintaining stability **Build Systems & Toolchains** • Maintain build infrastructure using CMake, Make, and embedded toolchains • Configure cross-compilation environments for ARM Cortex-M target architectures • Manage firmware dependencies, submodules, and third-party libraries • Create reproducible build configurations and automate firmware generation pipelines **Simulation & Hardware-in-the-Loop Testing** • Develop and maintain SITL (Software-in-the-Loop) and HITL (Hardware-in-the-Loop) test environments • Integrate PX4 with physics-based simulation platforms for validation and regression testing • Create automated test scenarios to validate firmware changes before flight testing • Configure MAVLink communication interfaces for ground control and companion computer integration **System Integration & Testing** • Integrate PX4 with companion computers running ROS2-based autonomy stacks • Develop MAVLink and UART communication protocols between flight controller and edge compute modules • Support flight test operations including pre-flight checks, log collection, and post-flight analysis • Collaborate with hardware, autonomy, and systems engineers to diagnose and resolve integration issues **Qualifications:** • Bachelor's in Computer Science, Computer Engineering, Electrical Engineering, Aerospace Engineering, or related field – equivalent industry experience also welcome • 4-6+ years of experience in embedded software development with focus on real-time systems • Strong proficiency in C and C++ for embedded systems programming • Hands-on experience with PX4 autopilot firmware architecture and development • Deep understanding of build systems including CMake, Make, and embedded toolchains • Experience with ARM Cortex-M microcontrollers and embedded debugging tools • Solid grasp of control theory, state estimation, and sensor fusion fundamentals • Understanding of MAVLink protocol and communication with ground control stations • Experience developing and maintaining simulation environments for embedded systems testing **Preferred:** • Experience with multi-rotor or fixed-wing UAV flight dynamics and control • Familiarity with ROS2 and companion computer integration architectures • Knowledge of Kalman filtering (EKF/UKF) and inertial navigation systems • Understanding of safety-critical software development practices • Experience with UART, SPI, I2C, and CAN bus protocols • Background in flight testing and airworthiness procedures • Knowledge of RTOS concepts and real-time scheduling • Experience with version control workflows for firmware development • Familiarity with Python for scripting, automation, and data analysis • Understanding of power systems, motor control, and electronic speed controllers • Experience with continuous integration systems for embedded firmware Pay range for this role $148,000—$179,000 USD **What's in it for you:** Benefits: - Competitive total compensation package - Comprehensive benefit package options include medical, dental, vision, life, and more. - 401k with company-match - 3 weeks of paid time off each year - 40 hours of sick time - 12 annual company holidays Why Join Zone 5 Technologies? - Innovative Environment: Work on cutting-edge technology that is shaping the future of defense and aerospace. - Collaborative Culture: Join a team of passionate professionals dedicated to pushing the boundaries of what’s possible. - Career Growth: Opportunities for professional development and career advancement. If you are passionate about unmanned aircraft technology and want to be a part of a dynamic and growing company, we would love to hear from you. Apply today and join the Zone 5 Technologies team! *In compliance with federal law, all persons hired will be required to verify identity and eligibility to work in the United States and to complete the required employment eligibility verification form upon hire.* *Zone 5 Technologies is a federal contractor and participates in E-Verify to confirm employment eligibility. As required by law, we will verify the identity and employment authorization of all new employees using the E-Verify system. Learn more about your rights and responsibilities under E-Verify: .*