Sr Software Engineer, Modeling and Simulation Onsite

RTX (Raytheon); Virginia; On-site; USD 110,000 - 160,000; Full time

Job summary

RTX's Mission Applied Science & Technology (MAST) directorate seeks a Senior Software Engineer to develop a Python-based application for simulation, modeling, and analysis of factory production models. This onsite role is based in Dulles/ Sterling, VA, Richardson, TX, McKinney, TX, or Aurora, CO, and involves collaborating with a multi-disciplinary team in an Agile environment.

You will design, implement, and review features for Python applications, optimize performance, support the full

Qualifications

• Typically requires a Bachelor's degree in STEM and 5+ years of experience.
• Experience with Python programming and scripting.
• Experience with Python libraries for backend and frontend development.
• Experience with code hosting and version control tools.

Responsibilities

• Design, develop, and implement new features for Python-based applications focused on modeling and simulation.
• Collaborate with cross-functional teams across multiple time zones to deliver innovative solutions.
• Conduct code reviews to ensure adherence to coding standards and best practices.
• Optimize and maintain the existing codebase for performance and efficiency.
• Support the software development lifecycle, including requirements gathering, design, implementation, unit testing, and system testing.
• Participate in Agile development process, providing regular updates on progress and status.
• Document software artifacts, including design documents, test procedures, and developer notes.

Skills

Python programming

NumPy

Pandas

SimPy

Panel

Bokeh

Plotly Dash

Graphviz

Git/Version control

Education

Bachelor's degree in STEM

Tools

Bitbucket

GitHub

GitLab

Azure DevOps

Job description

Date Posted: 2026-10-27

Country: United States of America

Location: US-VA-DULLES-710 ~ 22110 Pacific Blvd ~ BLDG 10

Position Role Type: Onsite

U.S. Citizen, U.S. Person, or Immigration Status Requirements: The ability to obtain and maintain a U.S. government issued security clearance is required. U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance

Security Clearance Type: TS/SCI with Polygraph

Security Clearance Status: Active and existing security clearance required after 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.

Raytheon brings the strength of more than 100 years of experience and renowned engineering expertise to meet the needs of today's mission and stay ahead of tomorrow's threat. We deliver solutions that help our nation and allies defend freedoms and deter aggression, creating a safer, more secure world. Join us and help shape the future of aerospace and defense.

Raytheon's Mission Applied Science & Technology (MAST) directorate is seeking a Senior Software Engineer to join our Factory and Data Solutions team. This role focuses on developing a Python-based application for simulation, modeling, and analysis of factory production models. Additional projects may include software development for mission management, command and control systems, AI/ML applications, or Live Virtual Constructive simulation environments. You will play a key role in enabling data-driven decision-making and collaborating with a multi-disciplinary team in an Agile development environment.

This is an onsite role located in Dulles / Sterling, VA, Richardson, TX, McKinney, TX, or Aurora, CO.

What You Will Do

• Design, develop, and implement new features for Python-based applications focused on modeling and simulation.
• Collaborate with cross-functional teams across multiple time zones to deliver innovative solutions.
• Conduct code reviews to ensure adherence to coding standards and best practices.
• Optimize and maintain the existing codebase for performance and efficiency.
• Support the software development lifecycle, including requirements gathering, design, implementation, unit testing, and system testing.
• Participate in Agile development process, providing regular updates on progress and status.
• Document software artifacts, including design documents, test procedures, and developer notes.

Qualifications You Must Have

• Typically requires a Bachelor's degree in Science, Technology, Engineering, or Mathematics (STEM) and a minimum of 5 years of experience unless prohibited by local laws/regulations.
• Experience with Python programming and scripting.
• Experience with one or more Python libraries and software packages for backend and frontend development, such as NumPy, Pandas, SimPy, Panel, Bokeh, Pydot, PyQt, Plotly Dash, HoloViz, or Graphviz.
• Experience with code hosting and version control tools, such as Bitbucket, GitHub, GitLab, or Azure DevOps.
• Experience in the software development lifecycle, including requirements, design, implementation, unit testing, and system testing.
• The ability to obtain and maintain a U.S. government-issued TS/SCI with Polygraph security clearance is required. U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance.

Qualifications We Prefer

• Experience with automated testing frameworks, such as PyTest.
• Experience with statistics, statistical modeling (e.g., logistic regression, Bayesian models), and/or data distribution fitting (e.g., normal, lognormal, Weibull).
• Familiarity with simulation modeling and analysis, including Discrete Event Simulation.
• Experience working with distributed teams across multiple time zones.
• Experience with Agile/Scrum software development methodologies.

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.

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.

Clearance Information: This position requires 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: https://www.state.gov/m/ds/clearances/c10978.htm

Location Info and/or Links:

DMV: https://careers.rtx.com/globa