Software Engineer III, Flight Software; Clearance Required

About The Role

Software Engineer III – responsible for designing, developing, and testing software applications for space systems and technologies. Requires expertise in at least one programming language, deep understanding of software development principles, and the ability to design and architect complex software systems. Duties include writing clean, maintainable code, collaborating with team members to understand project requirements, and contributing to the development of innovative software solutions.

The role also involves mentoring and guiding other engineers, providing technical leadership and support.

We seek individuals who are passionate about innovating beyond boundaries and relentlessly pursuing solutions that protect, preserve, and empower our national security. Ideal candidates align with our values, mission, and goals.

• Bachelor’s degree in a related field (or equivalent work experience in lieu of degree) or master’s degree + 3 years experience.
• Typically 5+ years of related experience.
• Expertise in one or more programming languages and advanced understanding of software development principles.
• Ability to design and architect complex software systems.
• Experience with Agile, Scrum/Kanban or similar software development methodologies.
• Strong problem‑solving skills.
• Ability to mentor and guide other engineers.
• Active Secret U.S. Security Clearance.

• Strong technical understanding of C++ and object‑oriented programming.
• Experience implementing client‑server applications using socket I/O (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 in both SITL and HITL 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 timing optimization.

Pay Range: $ - $. 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.

This position requires a current active Secret U.S. Security Clearance. U.S. Citizenship is required. Non‑U.S. citizens may not be eligible for a security clearance. The Department of Defense Consolidated Adjudications Facility (DoD CAF) handles the adjudicative aspects of the security clearance eligibility process.

We offer a generous benefits package, including medical, dental and vision plans, 401(k) with 150% match up to 6%, life insurance, 3 weeks paid time off and more.

Sierra Space is an industry‑leading space and defense technology company. We deliver mission‑proven technologies to safeguard our nation, protect space‑based assets and enable space exploration.

Sierra Space Corporation is an equal‑opportunity employer and is committed to providing reasonable accommodations to applicants with disabilities. If you need special assistance or a reasonable accommodation related to applying for employment, please contact us.