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: https://www.e-verify.gov .