Senior​/Principal Software Engineer - Special Programs, CA Onsite

About Sandia

Sandia National Laboratories is the nation's premier science and engineering lab for national security and technology innovation, with teams of specialists focused on cutting‑edge work in a broad array of areas. Some of the main reasons we love our jobs:

• Challenging work with amazing impact that contributes to security, peace, and freedom worldwide
• Extraordinary co‑workers
• Some of the best tools, equipment, and research facilities in the world
• Career advancement and enrichment opportunities
• Flexible work arrangements for many positions include 9/80 (work 80 hours every two weeks, with every other Friday off) and 4/10 (work 4 ten‑hour days each week) compressed workweeks, part‑time work, and telecommuting (a mix of onsite work and working from home)
• Generous vacation, strong medical and other benefits, competitive 401k, learning opportunities, relocation assistance and amenities aimed at creating a solid work/life balance*

World‑changing technologies. Life‑changing careers. Learn more about Sandia at: http://(Use the "Apply for this Job" box below)..gov

* These benefits vary by job classification.

Are you passionate about solving complex problems and applying your expertise to develop innovative solutions? Join our dynamic team and help solve critical challenges to enhance our nation’s security!

We are seeking an experienced Software Engineer (job title: R&D S&E Computer Science) to design and implement cutting‑edge solutions for high‑consequence national security challenges. In this role, you will collaborate with U.S. government customers to develop impactful capabilities that directly support warfighters, strengthen national security, and deliver measurable results for critical missions. Your contributions will foster innovation, leverage teamwork, and cultivate creativity while addressing key mission needs.

On any given day, you may be called on to:

• Lead and collaborate with technical design teams and subject matter experts to create innovative solutions that meet mission requirements and address end‑user needs.
• Utilize your skillset in software system architecture, software system implementation, technical documentation, reliability and performance assessment, and/or systematic technology insertion to enhance mission capabilities utilizing code bases ranging from 0.5 to 1.0+ million lines of code.
• Collaborate with Software Engineers, System Engineers, Information Technology staff, management, and customers to implement solutions that address requirements. Architect software systems, develop code, write unit tests, and create software tools to support the mission.
• Develop and execute test plans/procedures, create reports, and write software documentation.
• Perform system integration and unit testing.
• Apply system design principles to architect scalable, reliable, and secure solutions for critical missions.
• Incorporate software design methodologies to proactively address computer security considerations throughout the software development lifecycle.
• Develop and refine system CONOPS (Concept of Operations) to ensure technical solutions address operational needs.

This position requires willingness and ability to work in a 24/7/365 on‑call support role to provide software discrepancy resolution.

Due to the nature of the work, the selected applicant must be able to work onsite 100% of the time at the Livermore, CA site.

Applicants on this requisition may be interviewed by multiple organizations at Sandia National Laboratories.

Ability and willingness to travel, up to 25%, required.

$135,700 - $270,900

* Salary range is estimated, and actual salary will be determined after consideration of the selected candidate’s experience and qualifications, and application of any approved geographic salary differential.

• A Bachelor's degree in a relevant discipline and five (5) years of directly relevant experience, or an equivalent combination of directly relevant education and engineering or scientific experience that demonstrates the knowledge, skills, and ability to perform independent research and development.
• Ability to obtain and maintain a DOE Q‑level and SCI‑level security…