Principal Software Engineer, TS​/SCI Polygraph

Rivermatrix Technologies, Inc. | Full time

Annapolis Junction, United States | Posted on 07/16/2026

• Security Clearance Top Secret SCI/Polygraph
• Experience 20+ Years and Bachelor of Science
• City Annapolis Junction
• State/Province Maryland
• Country United States

Rivermatrix is seeking a Software Engineer tojoin an experienced team working on efforts to modernize an existing data tracking and metrics system. The User Experience (UX) developer should be able to focus on developing highly usable end user interfaces, applying UI best practices, and UX principles.

Rivermatrix is a small, technology first shop committed to delivering great work and treating our folks well. Joining Rivermatrix means being a valued member of a small team, not just a number lost in a crowd. We approach our work with creativity, mission-focus, and a passion for quality and results. Rivermatrix is built lean so we can drive resources towards what counts;

our employees. We believe that the quality of our staff, focus on building good technology (not just the bottom line), competitive salaries, great benefits, and employee investment are the foundation for our continued success.

Salary Range: $160,000 - $260,000. This is not a guarantee of compensation or salary. Salary will be set based on education, experience, geographic location and possibly contractual requirements and could fall outside of this range.

There are no shareholders or investment firms to report to. Our sole focus is building good technology.

The Software Engineer, shall have at least the following experience:

• Twenty (20) years of experience as a Software Engineer (SWE) supporting programs and contracts of similar scope, type, and complexity.
• Bachelor’s degree in Computer Science or a related discipline from an accredited college or university.
  
  Note:
  
  Four (4) additional years of SWE experience on projects with similar software processes may be substituted for a bachelor’s degree.
• Five (5) years of experience with a strong background in user-centered design, UI best practices, usability testing, and the software development lifecycle (analysis, design, implementation, and deployment).
• Work closely with users (analysts) to research, develop, and document user profiles and user performance requirements.
• Conduct task analysis and workflow mapping and develop and test user scenarios.
• Develop UI design specifications and support documentation ("e.g., wireframes, mockups, interaction behaviors, and design guidelines"), as needed to support development efforts.
• Collaborate with product designers and process engineers to inform application design and ensure user-centered solutions align with workflows and requirements.
• Conduct accessibility and 508 compliance testing to ensure user interfaces meet regulatory and usability standards.
• Collect and analyze user feedback through surveys and behavioral data to guide design improvements and UX decisions.
• Work independently while collaborating effectively with small teams and larger cross-functional groups.
• Create interactive prototypes to validate design concepts and communicate interactions to stakeholders and development teams.

• UI/UX experience
• 508 Compliance
• TS/SCI clearance with polygraph clearance required

• Experience with the following:

Rivermatrix offers a well rounded benefits package to include:

• PTO
• 401(k)
• Health
• Dental
• Vision
• Life
• Flexible Spending
• Professional Development
• Short & Long Term Disability
• and much more!