Software Engineer (UAS)

About UsExistX was founded in 2023 with the goal to combine cutting edge invention with practical implementation in the unique environments our customers demand to solve national security problems in the real world.Our team of software and systems engineers bring experience working with cutting-edge advancements in cryptography, cyber-physical systems, MBSE, and formal methods for both government and commercial applications. We leverage a unique suite of capabilities-incubated through our sister R&D firm, Galois, and other key research partnerships-to rapidly prototype and deliver impactful solutions to the warfighter.∃X.P(X):There exists a solution X that satisfies problem P.The solution exists. Let's build it together.About This RoleWe are seeking a mid-level Software Engineer (UAS) with experience supporting Department of Defense (DoD) programs, specializing in flight control systems, autopilot software, or autonomous vehicle control. The ideal candidate will contribute to the design, implementation, testing, and certification of mission-critical software used in unmanned systems. This role involves close collaboration with systems engineers, other software engineers, program managers, and hardware engineers to develop high-reliability, safety-critical software in compliance with DoD and aerospace standards. You will join a small, growing team where every person's contribution directly shape the Company's growth and impact. You'll collaborate with Program Management, Business Development, and senior executives as well as work alongside a group of world class engineers and researchers. We value curiosity, accountability, and collaboration.You will join a small, growing team where every person's contributions directly shape the Company's growth and impact. You'll collaborate with Engineering, Program Management, Business Development as well as work with a group of world class engineers, researchers, and leaders. We value curiosity, accountability, and collaboration.ResponsibilitiesThese responsibilities are executed in close collaboration with the CEO, COO, and Engineering leadership.Software Development & IntegrationDesign, develop, and maintain embedded and/or real-time software for flight control systems, autopilots, and autonomous guidance functionsImplement control algorithms, state estimation, sensor fusion, and actuator control logicIntegrate software with avionics hardware, sensors, and communication subsystemsSupport hardware-in-the-loop (HIL), software-in-the-loop (SIL), and simulation-based testing Program Execution Develop software in accordance with DoD acquisition and compliance requirementsParticipate in program reviews, design reviews, and milestone events (SRR, PDR, CDR)Support classified and unclassified program activities as requiredCollaborate with government stakeholders, prime contractors, and internal teams Verification, Validation & Safety Develop unit tests, integration tests, and automated test frameworksSupport verification and validation activities aligned with DO-178C, DO-331, MIL-STD-882, or similar standardsAssist with requirements traceability, documentation, and configuration managementIdentify and mitigate software risks in safety-critical environments Collaboration & Technical Growth Work closely with systems, controls, and test engineers to ensure end-to-end system performanceContribute to technical decisions, architecture discussions, and code reviewsMentor junior engineers and support continuous improvement of engineering practices Qualifications Required Bachelor's degree in Computer Science, Software Engineering, Aerospace Engineering, Electrical Engineering, or related field 3-7 years of professional software engineering experiencePossess a current/or recent U.S. Government Security Clearance (Secret minimum; higher levels preferred) or the ability to obtain and maintain a U.S. government issued security clearance is required.U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance.Demonstrated experience supporting Department of Defense programs.Proficiency in C/C++ (required); experience with Python or MATLAB/Simulink strongly preferred.Experience developing software for real-time or embedded systems.Familiarity with flight controls, autopilot systems, or autonomous vehicle software.Experience working in Linux-based development environments.Understanding of software development lifecycle in regulated or safety-critical domains. Preferred Experience with UAS / UAV, aircraft, or spacecraft flight software.Background in control theory, guidance & navigation, or state estimation (e.g., Kalman filters).Experience with PX4, ArduPilot, ROS/ROS2, or custom autopilot frameworks.Familiarity with DO-178C, DO-331 (Model-Based Development), or similar standards.Experience with HIL/SIL test systems, simulation tools, or digital twins.Exposure to Model-Based Systems Engineering (MBSE) practices.Active Top Secret clearance.Tools & Technologies Languages: C, C++, Python, MATLABRTOS / Embedded Platforms: VxWorks, QNX, FreeRTOS, or equivalentAutonomy & Controls: Simulink, PX4, ArduPilot, custom GNC stacksDevOps / Tooling: Git, Jira, Jenkins, CMake, DockerTesting: HIL/SIL rigs, unit test frameworks, simulation environments Success Criteria Reliable, high-quality flight control software delivered on schedule.Strong collaboration across software, systems, and controls teams.Clean, maintainable, and well-documented code.Successful participation in program reviews and test campaigns.Growing technical ownership of flight control or autonomy subsystems.General Attributes High attention to detail and time-management skills.Highly organized and proactive, with excellent multitasking and prioritization skills.Comfortable operating in a fast-paced, growth-focused environment with evolving priorities.Collaborative mindset with a focus on clarity, accountability, and follow-through.Curiosity for all things technology.Strong interpersonal and communication skills.Location ExistX is headquartered in Arlington, Virginia with additional locations in Dayton, Ohio and Portland, Oregon. We have some remote employees distributed across the U.S. Position may require eligibility to work with cleared programs (active clearance not required, but preferred). Hybrid or onsite presence may be required depending on contract or security requirements. Occasional interaction with government customers, auditors, or security personnel will be required. While we have a high preference for this role to be based in our Dayton, Ohio office, co-location in one of our core geographies, we will not be limited geographically for hiring this position. Benefits ExistX offers a highly competitive benefits program to support employees and their families, including: Competitive salariesEmployer paid medical insurance planHealth Savings Account (HSA) with employer contributionsEmployer paid dental and vision insurance plans401(k) retirement plan with employer matchFlexible work location with a remote friendly culturePaid time off (25 days per year)