Software Engineer III/Sr, Flight Software

Company: Sierra Space
Location: Louisville
Posted on: April 2, 2026

Job Description:

Sierra Space Careers: Dare to Dream We honor those that are not afraid to dream big dreams, those that tenaciously chase their dreams even when others say it cannot be done, those that achieve big dreams and change everything. Those are Dreams Worth Chasing. At Sierra Space we envision a future where humanity lives and works in space, on moons, and on distant planets. Our mission isn’t restricted to the few, instead we see a future where all people can choose to live, work, discover and explore beyond our planet. Our company is building a platform in space to benefit life on Earth and together we will alter the course of humanity. We have a bold mission. We are a bold company. Together, we are an extraordinary team. About the Role The Software Engineer role involves designing, developing, and testing software applications for space systems and technologies. This advanced position requires expertise in at least one programming language, an advanced understanding of software development principles, and the ability to design and architect complex software systems. The role includes writing clean, maintainable code, collaborating with team members to understand project requirements, and contributing to the development of innovative software solutions. Additionally, this position involves mentoring and guiding other engineers, providing technical leadership and support. About You Our mission is driven by the unwavering passion to push the boundaries of what is possible. We seek those who Dare to Dream — to envision the extraordinary and pursue it relentlessly – to join us on this transformational journey. We’re looking for dreamers who align with our values, vision and audacious goals – while also meeting the minimum qualifications below. The preferred qualifications are a bonus, not a requirement. Sierra Space’s Defense division focuses on the design, build, and operations of small satellites in support of commercial services and national security space. As a Flight Software Engineer, your primary responsibility will be designing and developing flight software and algorithms solutions for spacecraft missions for both civilian and DoD applications. These designs stem from understanding, analyzing and evaluating satellite and constellation capabilities, mission concepts, and system requirements. Your work will ensure we meet customer requirements by making data-driven decisions in architecting, implementing and testing the design in a testbed prototype and subsequent delivery of the flight code. Along the way, you will contribute to analyses of various architectures that include space vehicles, satellites, sensors, communications, and ground infrastructure, evolving or creating new approaches based on analysis results. You will also contribute to evaluating the mission effectiveness of the candidate approaches, balancing mission objectives against factors such as development and lifecycle costs. The Software Engineer participates in all portions of the software life cycle (concept development, requirements definition, design, development, testing, and deployment) of flight software to support ongoing and future small satellite programs. This individual must have a strong working knowledge of object-oriented design using C++ and must have a strong background in developing flight code on embedded processors. The candidate must also be comfortable working in an Agile Scrum environment. Key Responsibilities: Design, develop, and test software applications for space systems and technologies. Write clean, maintainable code following best practices and coding standards. Architect and implement complex software systems to meet project requirements. Collaborate with team members to understand project requirements and contribute to the development of software solutions. Utilize version control systems such as Git to manage code changes and collaborate with team members. Participate in code reviews to ensure code quality and adherence to development standards. Troubleshoot and resolve software-related issues in a timely manner. Document software configurations, processes, and procedures for future reference. Stay current with industry trends and advancements in software development and space technologies. Mentor and guide other engineers, providing technical leadership and support. Minimum Qualifications: Requires a bachelor’s degree in a related field (or equivalent work experience in lieu of degree or master’s 3 yrs experience). Typically, 5 years of related experience. Expertise in one to multiple programming languages and advanced understanding of software development principles. Ability to design and architect complex software systems. Experience with different software development methodologies such as Agile and Scrum/Kanban. Strong problem-solving skills. Ability to mentor and guide other engineers. The ability to obtain and maintain a U.S. Security Clearance is required Preferred Qualifications: Strong technical understanding of C++ and Object-Oriented Programming Experience implementing client-server applications using socket I/O using TCP/UDP. Experience implementing loosely coupled applications using PUB/SUB messaging Familiarity with Open Standards such as CCSDS, C2MS, Open Mission Systems (OMS), and Universal C2 Interface (UCI) Experience with spacecraft flight software development Experience developing mission management and/or payload control software Demonstrated experience leading a team developing software Experience with software tools for requirements tracking, code reviews, static analysis, library and artifact repository, and automated build Knowledge of software development methodologies such as Agile/Scrum Experience and knowledge of Software Design Patterns Experience using SysML/UML to create Software Designs Experience testing and debugging on both Software in the Loop (SITL) and Hardware in the Loop (HITL, on target platform) environments Experience with Source Code Configuration Management platforms (GIT, SVN) Experience developing on Linux Experience with network configurations including netconf Experience with embedded programming including new board build up Experience optimizing computer system performance including optimization for timing ? Compensation: Pay Range: $126,610.00 - $174,088.75 Your actual base compensation will be determined on a case-by-case basis and may vary based on job-related knowledge and skills, education, experience, internal equity and market competitiveness. Physical/Mental/Emotional Requirements: Frequently walk, sit, stand, climb stairs and steps Frequently repeat same hand, arm, and finger motion many times to include finger and hand dexterity Rarely lifting or carrying up to 20 lbs. Working Conditions: Rarely exposed to outdoor elements (high/low temperatures, sun, rain/snow, etc.) Rarely exposed to fumes or hazardous chemicals/materials Rarely exposed to loud noises IMPORTANT NOTICE: This position requires the ability to obtain and maintain a U.S. Security Clearance. U.S. Citizenship status is required as this position needs an active U.S. Security Clearance for employment. Non-U.S. citizens may not be eligible to obtain a security clearance. The Department of Defense Consolidated Adjudications Facility (DoD CAF), a federal government agency, handles the adjudicative aspects of the security clearance eligibility process for industry applicants. Adjudicative factors which affect the outcome of the eligibility determination include, but are not limited to, allegiance to the U.S., foreign influence, foreign preference, criminal conduct, security violations and illegal drug use. Elevate Your Career At Sierra Space, we are committed to your personal and professional development. We empower you to make profound and meaningful contributions and foster a vibrant culture of collaboration, where teamwork ignites breakthrough innovations. Sierra Space offers annual incentive pay based upon performance that is commensurate with the level of the position. We also offer a generous benefit package, including medical, dental, and vision plans, 401(k) with 150% match up to 8%, life insurance, 3 weeks paid time off, and more. At Sierra Space we are at the very doorstep of unlocking the future and the work in front of us is hard, but it is truly important and meaningful. Achieving our mission requires dedication, relentless pursuit of a dream and an unwavering passion for pushing the boundaries to accomplish what others might believe to be impossible. We seek those who too, Dare to Dream and will join us in a pursuit to achieve the extraordinary. Application Deadline: This role will remain posted until a qualified pool of candidates are identified. Please note: Sierra Space does not accept unsolicited resumes from contract agencies or search firms. Any unsolicited resumes submitted to our website or to Sierra Space team members not through our approved vendor list or Talent Acquisition will be considered property of Sierra Space, and we will not be obligated to pay any referral fees. Sierra Space Corporation is an equal opportunity employer and is committed to working with and providing reasonable accommodations to applicants with disabilities. If you need special assistance or a reasonable accommodation related to applying for employment with Sierra Space or at any stage of the recruitment process, please contact us .

Keywords: Sierra Space, Cheyenne , Software Engineer III/Sr, Flight Software, IT / Software / Systems , Louisville, Wyoming