Senior Systems Engineer

Job ID: 8844Req ID: 1699Location: 220 Daniel Webster Hwy, Merrimack, NH 03054, USAPosted: 2026-09-25Job Family: EngineeringJob Function: Systems EngineeringPay Type: Salary Company Information: Twenty-Six Defense, headquartered in Fort Worth, Texas, is a leading provider of high-performance products, system solutions, and aftermarket support services focusing on the defense, homeland security, and commercial aviation markets. With facilities throughout the U.S., Twenty-Six Defense is dedicated to supporting those who contribute to the national security of the United States. Twenty-Six Defense is wholly owned by Elbit Systems Ltd. (NASDAQ: ESLT and TASE: ESLT), a global high-technology company engaged in a wide range of programs for innovative defense and commercial applications. Job Summary: The Senior System Engineer is responsible for supporting the development, analysis, and integration of linear, non-linear, and digital control systems by collaborating closely with customers to understand technical requirements and mission needs. The position works across design and development domains to create, review, and document system-level operational concepts, ensuring seamless platform integration and rigorous verification and validation of complex system designs against functional specifications. Additional responsibilities include contributing to proposal development through technical writing, cost estimating, and presentations, as well as producing high ‑ quality technical documentation, specifications, and standards. The role requires strong communication skills, the ability to work both independently and with internal and external stakeholders, and a willingness to travel domestically and internationally approximately 10–15% of the time. Responsibilities and Tasks: Attend customer meetings for the purpose of understanding their requirements related to linear and non-linear control systems including digital controls Work with the design and development domain control systems Review, develop and document system level operational concepts and mission statements. Understand platform integration requirements at the platform level Verification and validation of highly complex system designs to ensure conformance with functional specifications and customer requirements Support proposal development activities, including proposal text development, cost estimating and presentation activities Produce and/or review technical documents, specifications and standards Ability to effectively document and communicate designs, results, reports, status and presentations Work independently and with internal/external organizations Education, Experience, License, or Certification: Bachelor of Science in Electrical Engineering, Mechanical Engineering, Aeronautical Engineering or other relevant degree 5+ years of experience in Servo Control, Motion Control, or Navigation. Proven experience in classical linear and non-linear control including digital control preferred Skills and Abilities: Knowledge of approximation and Kalman filters Knowledge of inertial sensors Working knowledge of C language and MATLAB is a must. Experience with design and development in time and frequency domain control systems Ability in development of models and simulations of dynamic systems in Simulink Travel/Physical Requirements: Approximately 10-15% travel both domestically and internationally. Here Are Some of the Great Benefits We Offer: Most locations offer a 9/80 schedule, providing every other Friday off Competitive compensation & 401(k) program to plan for your future Robust medical, dental, vision, & disability coverage with qualified wellness discounts Basic Life Insurance and Additional Life & AD&D Insurances are available Flexible Vacation & PTO Paid Parental Leave Generous Employee Referral Program Voluntary Benefits Available: Longer Term Care, Legal, Identity Theft, Pet Insurance, and more Voluntary Tricare Supplement available for military retirees This job description does not list all the duties of the job. You may be asked by your supervisors or managers to perform other duties. The employer has the right to revise this job description at any time. The job description is not an employment contract. Reasonable accommodations may be made to enable individuals with disabilities to perform the essential functions of this position. Twenty-Six Defense is an equal opportunity employer as to all protected groups, including protected veterans and individuals with disabilities. *For Virginia-based positions only* In accordance with Virginia DOL requirements, the listed salary range reflects the anticipated base pay range for this role. Actual compensation will be determined based on factors including skills, experience, education, certifications, business needs, internal equity, and geographic location. Compensation may vary in different locations based on market conditions and cost-of-labor considerations. Please ensure your résumé meets the Dayforce upload requirements. Dayforce supports résumé files up to 4 MB. To avoid upload issues, please: save your résumé as a PDF, remove photos/graphics/embedded objects, ensure the file is under 4 MB, and avoid password‑protected PDFs. 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