Sr. Principal Software Engineer (SW Modeler/Developer)

RELOCATION ASSISTANCE: Relocation assistance may be available CLEARANCE REQUIRED FOR START: Yes CLEARANCE TYPE: Secret TRAVEL: Yes, 10% of the Time Description At Northrop Grumman, our employees have incredible opportunities to work on revolutionary systems that impact people's lives around the world today, and for generations to come. Our pioneering and inventive spirit has enabled us to be at the forefront of many technological advancements in our nation's history - from the first flight across the Atlantic Ocean, to stealth bombers, to landing on the moon. We look for people who have bold new ideas, courage and a pioneering spirit to join forces to invent the future, and have fun along the way. Our culture thrives on intellectual curiosity, cognitive diversity and bringing your whole self to work — and we have an insatiable drive to do what others think is impossible. Our employees are not only part of history, they're making history. Northrop Grumman’s Space Sector is seeking a Sr. Principal Software Engineer (SW Modeler/Developer) to join our team of highly qualified, diverse professionals within the Western Region Software Engineering directorate. This position is located onsite in Redondo Beach, CA. The Western Region Software Engineering organization comprises over 800 skilled professionals—including Software Engineers, DevOps Engineers, Database Administrators, and Network Engineers—at all career levels, from early‑career engineers to senior chief engineers and architects. This engineering organization supports numerous programs and offers ample opportunities for advancement into higher‑level technical roles or leadership positions. Our culture promotes cross‑program collaboration, continuous professional development, and a strong sense of community. Job responsibilities of the Sr. Principal Software Engineer (SW Modeler/Developer) include, but are not limited to, the following: Work with mission‑planning workflows to integrate operational constraints and real‑world mission requirements. Apply advanced debugging, troubleshooting, and integration skills within large‑scale distributed systems. Provide proven leadership in task management and mentor team members across dynamic program schedules with tight deadlines. Design modular, reusable software architectures that reduce overall code footprint while enhancing maintainability and scalability. Conduct software design and modeling analysis. Basic Qualifications: Bachelor's degree in a STEM (Science, Technology, Engineering, and Mathematics) discipline with 8+ years of relevant software engineering experience or Master's degree in STEM with 6+ years of stated experience or Ph.D. in STEM with 4+ years of stated experience Expertise in designing, developing, and refactoring mission‑critical ground software, including backend systems (Python) and operator‑facing front‑end tools (React JS or similar). Active U.S. Government Secret clearance required at the time of application. Experience with CI/CD pipelines for automated builds, testing, and deployment. Proficiency with software‑design and/or software‑modeling tools. Preferred Qualifications: Direct experience supporting or developing tools for LEO satellite constellations or ground systems. Expertise in mission‑critical ground software development using backend languages (C, C++) and front‑end frameworks (React JS or similar). Experience building software for proliferated constellations and associated ground systems, covering mission planning, data telemetry, and command‑and‑control workflows. Hands‑on experience with detailed software design using Cameo. Comprehensive understanding of zero‑trust security architectures and secure‑by‑design principles for mission‑critical applications. Strong background in multi‑tenant, plug‑and‑play ground‑system concepts, including cloud‑native implementations with AWS services (Lambda, DynamoDB, API Gateway, etc.). Familiarity with compatibility testing and hardware‑in‑the‑loop environments to ensure operational readiness and reliability under realistic mission conditions. Knowledge or certification in agile development methodologies, with experience in iterative design and rapid prototyping to respond dynamically to evolving mission architectures. Proficiency with FastAPI, MongoDB, Kafka, Docker, AWS Lambda, DynamoDB, Angular, SQS, EFS, and S3. Curious about all the exciting developments with the Northrop Grumman Space Sector? Click the link below: Working at Northrop Grumman is more than just a paycheck. We offer a comprehensive Total Rewards and benefits package designed to help you thrive at work and in life. For more information on our Total Rewards package, please visit our Total Rewards site: Northrop Grumman Total Rewards. As a full-time employee of Northrop Grumman, you are eligible for: -Medical, Dental & Vision coverage -401k -Educational Assistance -Life Insurance -Employee Assistance Programs & Work/Life Solutions -Paid Time Off -Health & Wellness Resources -Employee Discounts -Flexible Schedules: for example, the ability to work a 9/80 work schedule, which allows an employee to work a nine-hour day Monday through Thursday and take every other Friday off of work. #LosAngelesSpace #LI-DB1 Primary Level Salary Range: $142,200.00 - $213,400.00 The above salary range represents a general guideline; however, Northrop Grumman considers a number of factors when determining base salary offers such as the scope and responsibilities of the position and the candidate's experience, education, skills and current market conditions. Depending on the position, employees may be eligible for overtime, shift differential, and a discretionary bonus in addition to base pay. Annual bonuses are designed to reward individual contributions as well as allow employees to share in company results. Employees in Vice President or Director positions may be eligible for Long Term Incentives. In addition, Northrop Grumman provides a variety of benefits including health insurance coverage, life and disability insurance, savings plan, Company paid holidays and paid time off (PTO) for vacation and/or personal business. The application period for the job is estimated to be 20 days from the job posting date. However, this timeline may be shortened or extended depending on business needs and the availability of qualified candidates. Northrop Grumman is an Equal Opportunity Employer, making decisions without regard to race, color, religion, creed, sex, sexual orientation, gender identity, marital status, national origin, age, veteran status, disability, or any other protected class. For our complete EEO and pay transparency statement, please visit U.S. Citizenship is required for all positions with a government clearance and certain other restricted positions. Existing Applicants: Need to update your contact information or email address? Once logged in, click on Candidate Home in the upper right corner and scroll to the bottom of that screen to see buttons for: Update Contact information to update your legal name, address, and phone number Edit Account Settings to edit your email address We are a pioneering company. With careers across all areas: air, cyber, land, sea and space – our 90,000 employees work as one to defend and define the future. Northrop Grumman careers and internships are as varied as your interests, with a lifetime of potential that will give you every opportunity to do your best work. Working together with people from many backgrounds, personal passions and disciplines, we share a drive to push the boundaries of science, technology and engineering to meet the ever evolving needs of our customers worldwide.