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

Sierra Space

$126,610 - $174,089
Dec 22, 2025
Centennial, CO, US
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Sierra Space is looking to solve the problem of designing, developing, and testing software applications for space systems and technologies to safeguard the nation, sustain human presence in space, and secure the freedom of operations in low Earth orbit and beyond.

Requirements

  • 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 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)

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.

Other

  • 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.
  • Ability to obtain and maintain a U.S. Security Clearance is required
  • 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.