Software Engineer III​/Sr​/Principal, Flight Software; Contractor

Software Engineer III/Sr/Principal, Flight Software (Contractor)

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Sierra Space Careers

At Sierra Space, we build the missions and systems that keep our world secure in the domain above Earth. Sierra Space team members share a spirit of innovation and collaboration and a belief that we can deliver on the boldest missions in space today. Together with our customers, we aim to safeguard our nation, sustain human presence in space, and secure the freedom of operations in low Earth orbit and beyond.

Our success is measured by the trust of those who rely on what we build and deliver, and our technologies keep the United States and its allies mission-ready throughout space. We are mission-driven, and together, we are an extraordinary team.

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.

Our mission is driven by an unyielding commitment to advancing space-based technology in service of our customers and safeguarding national security. We seek individuals who are passionate about innovating beyond boundaries and relentlessly pursuing solutions that protect, preserve and empower – to join us in this critical mission. We’re looking for team members who align with our values, mission and 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.

• 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.

• 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.

• 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…