Software Engineer I - Onsite

About this role

Date Posted: 2026-11-09

Country: United States of America

Location: US-VA-ARLINGTON-VA1 ~ 2461 S Clark St ~ BLDG 1, Ste 1000

Position Role Type: Onsite

U.S. Citizen, U.S. Person, or Immigration Status Requirements: Active and transferable U.S. government issued security clearance is required prior to start date.​ U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance​

Security Clearance Type: DoD Clearance: Secret

Security Clearance Status: Active and existing security clearance required on day 1

At RTX, the world's largest aerospace and defense company, 185,000 great minds are united by purpose and inspired to make a difference solving the world’s most complex problems. With our three market leading businesses, world-class operations and investments in research and development, we offer capabilities and opportunity no one else can. Together, we push the boundaries of known science and find new ways to connect and protect our world. As a Software Engineer you will be part of a team of systems engineers dedicated to delivering best-in-class Raytheon products for the warfighter through modeling, simulation, and analysis.  Your work will help demonstrate mission effectiveness of systems and system-of-systems operating in complex threat environments.  On this team, you will be responsible for developing and analyzing solutions across mission technologies, including sensors, effectors, communications, command and control, and more. This is an onsite role in Arlington, VA What You Will Do: This is an onsite modeling and simulation (ModSim) position using our Python-based proprietary ModSim software called Rapid Campaign Analysis, Development Environment (RCADE). You will support the design, development, and utilization of medium-fidelity digital simulation software in advanced technical computing environments. You will contribute your knowledge to evaluate work across a wide range of intriguing computational problems to answer operational questions such as: ·       What should the next military system-of-systems look like? ·       What is the effectivity of new technologies against large-force adversaries and multiple threats? ·       What countermeasures should be considered to increase effectivity and/or improve survivability, and what are the answers to the customer’s operational performance questions? ·       What numbers and costs get the best performance? ·       You will contribute to mission-level system modeling and data analysis activities to support new business, system-of-systems design, and operational impacts of new concepts of operations. ·       You will contribute and collaborate with your team using inputs from program, external customers, or team experts, while working on projects across multiple military operational domains (aerospace, maritime, subsurface, land, space) as you determine, develop, and implement analysis to generate informed decisions.

·       You will support and build ModSim software and analyze results to influence the product lifecycle. ·       You will develop and implement model-based solutions to support mission trade studies using mission level simulations to ensure they meet defined requirements and performance. ·       You will innovate and explore new ideas. Qualifications You Must Have: ·       Bachelor’s degree in science, Technology, Engineering, or Mathematics (STEM), or equivalent experience. ·       Applied and/or academic experience of modeling and simulation of physical systems. ·       Scripting languages such as Python, Shell or Perl. ·       Numerical computing environments such as MATLAB. Experience may be obtained through on-the-job experience, research, coursework, or projects. Qualifications We Prefer: ·       Previous experience in RCADE. ·       Specific majors: Systems Engineering, Software Engineering, Operations Research, Math, Applied Math, Industrial Engineering, Physics, Aerospace Engineering, or similar. ·       Knowledge of the system engineering life-cycle model. ·       Experience in data analysis and statistics, especially dealing with large volumes of data. ·       Coursework or internship experience in the following areas: ·       Software development processes and object-oriented design using C/C++ and/or Java in either Unix or Linux computing environments. ·       AI/ML and high-performance computing (HPC) grids. ·       Demonstrated ability to work effectively with a high performing team. What We Offer: ·        Our values drive our actions, behaviors, and performance with a vision for a safer, more connected world. At RTX we value: Safety, Trust, Respect, Accountability, Collaboration, and Innovation. ·        Relocation Eligible Learn More & Apply Now! Please consider the following role type definition as you apply for this role. ·        Onsite: Employees who are working in Onsite roles will work primarily onsite. This includes all production and maintenance employees, as they are essential to the development of our products. This position requires ability to obtain a security clearance. DCSA Consolidated Adjudication Services (DCSA CAS), an agency of the Department of Defense, handles and adjudicates the security clearance process. More information about Security Clearances can be found on the US Department of State government website here: Security Clearance FAQs - United States Department of State

As part of our commitment to maintaining a secure hiring process, candidates may be asked to attend select steps of the interview process in-person at one of our office locations, regardless of whether the role is designated as on-site, hybrid or remote.

The salary range for this role is 62,900 USD - 119,700 USD. The salary range provided is a good faith estimate representative of all experience levels. RTX considers several factors when extending an offer, including but not limited to, the role, function and associated responsibilities, a candidate’s work experience, location, education/training, and key skills.

Hired applicants may be eligible for benefits, including but not limited to, medical, dental, vision, life insurance, short-term disability, long-term disability, 401(k) match, flexible spending accounts, flexible work schedules, employee assistance program, Employee Scholar Program, parental leave, paid time off, and holidays. Specific benefits are dependent upon the specific business unit as well as whether or not the position is covered by a collective-bargaining agreement.

Hired applicants may be eligible for annual short-term and/or long-term incentive compensation programs depending on the level of the position and whether or not it is covered by a collective-bargaining agreement. Payments under these annual programs are not guaranteed and are dependent upon a variety of factors including, but not limited to, individual performance, business unit performance, and/or the company’s performance.

This role is a U.S.-based role. If the successful candidate resides in a U.S. territory, the appropriate pay structure and benefits will apply.

RTX anticipates the application window closing approximately 40 days from the date the notice was posted. However, factors such as candidate flow and business necessity may require RTX to shorten or extend the application window.

RTX is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability or veteran status, or any other applicable state or federal protected class. RTX provides affirmative action in employment for qualified Individuals with a Disability and Protected Veterans in compliance with Section 503 of the Rehabilitation Act and the Vietnam Era Veterans’ Readjustment Assistance Act.

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