Senior Specialist, Systems Engineer - Modeling and Simulation

L3Harris Technologies is seeking a Modeling & Simulation Engineer to support high-visibility national security space programs. This role focuses on developing and executing high-fidelity space mission simulations to evaluate spacecraft performance, mission resilience, and operational effectiveness in contested and dynamic environments. The selected candidate will apply astrodynamics, analytical modeling, and mission-focused simulation techniques to support operational planning, system performance analysis, mission protection, and digital engineering initiatives. Essential Functions: •Experience with orbital mechanics modeling and space mission analysis. •Develop, implement, and maintain high-fidelity space mission models and simulations supporting operational planning, performance analysis, and mission assurance activities. •Perform orbital mechanics modeling including orbit propagation, maneuver analysis, rendezvous and proximity operations (RPO), conjunction assessment, and/or covariance analysis. •Develop and execute threat-informed simulation scenarios incorporating adversary capabilities, red vs blue modeling, and Space Domain Awareness (SDA) considerations. •Present technical findings, risk assessments, and analytical insights to program leadership and/or customer stakeholders. •Support exercise planning, wargaming activities, and mission rehearsal simulations as required. Qualifications: •Bachelor's degree and minimum 4 years of prior relevant experience. Graduate degree and a minimum of 2 years of prior related experience. In lieu of a degree, minimum of 8 years of prior related experience. •Top Secret/SCI with CI Poly required. •2 years of experience demonstrating the ability to translate operational requirements into executable simulation architectures. •2 years experience with modeling tools such as STK, ODTK, GMAT, FreeFlyer, or Python-based analytical environments. Preferred Additional Skills: •Experience supporting Space Domain Awareness (SDA), Mission Protection, or national security space operations programs. •Knowledge of threat modeling and contested space environments. •Experience supporting wargaming or operational exercises in coordination with Department of War (DoW) and Intelligence Community (IC) organizations, including U.S. Space Force and the National Reconnaissance Office (NRO). L3Harris Technologies is proud to be an Equal Opportunity Employer. L3Harris is committed to treating all employees and applicants for employment with respect and dignity and maintaining a workplace that is free from unlawful discrimination. All applicants will be considered for employment without regard to race, color, religion, age, national origin, ancestry, ethnicity, gender (including pregnancy, childbirth, breastfeeding or other related medical conditions), gender identity, gender expression, sexual orientation, marital status, veteran status, disability, genetic information, citizenship status, characteristic or membership in any other group protected by federal, state or local laws. L3Harris maintains a drug-free workplace and performs pre-employment substance abuse testing and background checks, where permitted by law. Please be aware many of our positions require the ability to obtain a security clearance. Security clearances may only be granted to U.S. citizens. In addition, applicants who accept a conditional offer of employment may be subject to government security investigation(s) and must meet eligibility requirements for access to classified information. By submitting your resume for this position, you understand and agree that L3Harris Technologies may share your resume, as well as any other related personal information or documentation you provide, with its subsidiaries and affiliated companies for the purpose of considering you for other available positions. L3Harris Technologies is an E-Verify Employer. Please click here for the E-Verify Poster in English or Spanish . For information regarding your Right To Work, please click here for English or Spanish .