Sr. Principal Software Engineer

RELOCATION ASSISTANCE: Relocation assistance may be available CLEARANCE REQUIRED FOR START: No CLEARANCE TYPE: None 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 to support the design, development, enhancement, and sustainment of web applications for the Manufacturing and Operations organization. This role can be based in either Redondo Beach, CA / Promontory, UT OR Linthicum, MD . This role will lead development activities across the application lifecycle, partnering with functional stakeholders, technical teams, and program leadership to deliver secure, scalable, and maintainable software solutions that support manufacturing and operational objectives. The ideal candidate brings strong hands-on experience in ASP.NET Core, C#, SQL Server, and Agile delivery practices, along with the ability to guide technical direction, support modernization efforts, and mentor other developers in a mission-focused environment. What the role offers: • Opportunity to lead development of applications that directly support Space Sector manufacturing and operations. • Exposure to modernization and sustainment efforts across critical internal platforms. • Collaborative environment with opportunities to influence technical direction and engineering practices. Key Responsibilities • Sustain and enhance legacy .NET Framework applications, including assessing and modernizing codebases (e.g. migrating to .NET Core) as business needs evolve. • Work with other software engineers on the architecture, design, development, testing, deployment, and sustainment of web-based business applications. • Develop and maintain applications using ASP.NET Core and C#. • Design, optimize, and support back-end data solutions using SQL Server. • Collaborate with business partners, product owners, analysts, and other engineers to define technical solutions aligned to operational needs. • Support full software lifecycle activities, including requirements analysis, code reviews, troubleshooting, defect resolution, and performance improvement. • Drive adherence to software engineering best practices, coding standards, and secure development approaches. • Participate in and help lead Agile ceremonies, sprint planning, backlog refinement, and technical estimation. • Mentor and support junior and mid-level developers. • Contribute to system modernization, integration, and continuous improvement initiatives across manufacturing and operations applications. • Work closely with cybersecurity, infrastructure, and program teams to ensure deployed solutions meet mission and security requirements. Basic Qualifications • Bachelor's Degree in a STEM discipline plus with 8 years of engineering/technical experience; OR a Master's Degree in a STEM discipline plus 6 years of engineering/technical experience. • Experience developing and supporting web applications using C# and ASP.NET Core. • Experience with SQL Server data