Sr. Principal Software Engineer

Job Description
BAE Systems is seeking an experienced developer to contribute to the BAE Systems Fuels maintenance applications, supporting DLA's fuel automation equipment program. You'll work on complex business logic, integrate with enterprise authentication systems, and help establish patterns for junior developers to follow.

Key Responsibilities

• Design and implement workflow state machine for form approval lifecycle
• Build deliverable automation system (PDF packaging, CI number assignment)
• Implement complex repository methods with Entity Framework Core
• Design and implement service layer components (business logic)
• Create reusable WPF controls and MVVM components
• Optimize database queries and resolve performance bottlenecks
• Mentor entry-level developers through code reviews and pair programming
• Write comprehensive unit and integration tests
• Implement security features (role-based access control, audit logging)
• Participate in architecture decisions for new features

This position will require work on multiple programs. This allows consideration of candidates in the following areas: Charleston, South Carolina; McLean, Virginia; and Huntsville, Alabama.
The selected candidate must reside or be willing to relocate to one of these areas.

Required Education, Experience, & Skills
Technical:

• Bachelor's of Science and 10 years of professional software development experience
• Active Secret clearance and ability to obtain and maintain a Top Secret security clearance
• Strong C# and .NET development skills (.NET Core/.NET 5 experience)
• Solid understanding of MVVM pattern and data binding
• Experience with Entity Framework Core or similar ORM
• Proficiency with relational database design and SQL
• Experience with dependency injection containers (Autofac, Microsoft.Extensions.DI, etc.)
• Understanding of async/await patterns and concurrency
• Git workflow experience (branching, merging, pull requests)
• Unit testing experience (xUnit, NUnit, Moq)
• Aveva Framework or other industrial control framework experience

Soft Skills:

• Ability to work independently without supervision
• Strong problem-solving skills for complex technical challenges
• Mentoring and knowledge-sharing with junior developers
• Clear technical communication (architecture discussions, code reviews)
• Ability to translate business requirements into technical designs
• Comfortable working with government SOPs and compliance requirements

Preferred Education, Experience, & Skills
Preferred Skills (Nice to Have)

• WPF application development experience
• PostgreSQL administration and optimization
• OAuth 2.0 / OpenID Connect implementation experience
• Keycloak or other identity provider integration
• Experience with iText or other PDF libraries
• Background with military or government contract systems
• FluentValidation experience
• Serilog or structured logging frameworks
• Experience with hash chain or tamper-evident audit systems
• Understanding of DoD security requirements (STIGs, FIPS 140-2)

Pay Information
Full-Time Salary Range: $120000 - $204000

Please note: This range is based on our market pay structures. However, individual salaries are determined by a variety of factors including, but not limited to: business considerations, local market conditions, and internal equity, as well as candidate qualifications, such as skills, education, and experience.

Employee Benefits: At BAE Systems, we support our employees in all aspects of their life, including their health and financial well-being. Regular employees scheduled to work 20 hours per week are offered: health, dental, and vision insurance; health savings accounts; a 401(k) savings plan; disability coverage; and life and accident insurance. We also have an employee assistance program, a legal plan, and other perks including discounts on things like home, auto, and pet insurance. Our leave programs include paid time off, paid holidays, as well as other types of leave, including paid parental, military, bereavement, and any applicable federal and state sick leave. Employees may participate in the company recognition program to receive monetary or non-monetary recognition awards. Other incentives may be available based on position level and/or job specifics.


About BAE Systems Intelligence & Security
BAE Systems, Inc. is the U.S. subsidiary of BAE Systems plc, an international defense, aerospace and security company which delivers a full range of products and services for air, land and naval forces, as well as advanced electronics, security, information technology solutions and customer support services. Improving the future and protecting lives is an ambitious mission, but it’s what we do at BAE Systems. Working here means using your passion and ingenuity where it counts – defending national security with breakthrough technology, superior products, and intelligence solutions. As you develop the latest technology and defend national security, you will continually hone your skills on a team—making a big impact on a global scale. At BAE Systems, you’ll find a rewarding career that truly makes a difference.

Intelligence & Security (I&S), based in McLean, Virginia, designs and delivers advanced defense, intelligence, and security solutions that support the important missions of our customers. Our pride and dedication shows in everything we do—from intelligence analysis, cyber operations and IT expertise to systems development, systems integration, and operations and maintenance services. Knowing that our work enables the U.S. military and government to recognize, manage and defeat threats inspires us to push ourselves and our technologies to new levels.

This position will be posted for at least 5 calendar days. The posting will remain active until the position is filled, or a qualified pool of candidates is identified.

Salary : $120,000 - $204,000