Principal Systems Engineer

Accelint is a mission-driven technology company focused on strengthening national security and supporting critical industries. The Principal Systems Engineer serves as the technical authority for complex systems development efforts, providing end-to-end systems engineering leadership across requirements development, design, integration, verification, and delivery.

Responsibilities:

• Lead the development, decomposition, and management of system, subsystem, and interface requirements in alignment with customer needs and program objectives
• Collaborate with the engineering team to ensure requirements are traceable, verifiable, and aligned with mission performance
• Participate in subsystem architecture trades to balance performance, cost, schedule, and risk
• Review and approve technical approaches to ensure designs meet requirements and integrate cleanly at the system level
• Provide technical oversight and direction to subcontractors and suppliers delivering hardware, software, and system elements
• Review subcontractor designs, analyses, test plans, and test results for compliance with requirements and interfaces
• Review and approve subcontractor technical artifacts, including requirements, designs, test plans, and deliverables
• Serve as a technical interface between subcontractors, internal engineering teams, and government stakeholders
• Actively participate in technical reviews, ensuring technical rigor and risk mitigation with subcontractors and customers
• Mentor and develop junior and mid-level engineers, fostering strong systems engineering practices and technical growth
• Promote consistency in systems engineering processes, tools, and best practices across programs
• Foster a culture of continuous learning, technical curiosity, and accountability
• Support proposal and capture efforts by contributing technical approaches, requirements understanding, and engineering cost estimates
• Write technical content including white papers, technical sections of proposals, status reports, and internal documentation
• Deliver effective internal and external technical briefings
• Engage with customers and partners to understand technical needs and communicate SIE’s engineering capabilities

Requirements:

• Bachelor's degree in Systems Engineering, Electrical Engineering, Mechanical Engineering, Computer Engineering, or a related technical field (Master's preferred)
• 10+ years of experience in systems engineering across complex, multidisciplinary systems
• Demonstrated ability to lead technical teams and influence across organizational boundaries
• Experience managing requirements, interfaces, and technical baselines throughout the system lifecycle
• Strong written and verbal communication skills, including experience with customer and executive-level briefings
• Active or ability to obtain a security clearance (if applicable)
• Experience with subcontractor technical management
• Familiarity with Model-Based Systems Engineering (MBSE) and modern SE tools
• Experience in defense, aerospace, or other highly regulated technical environments