{"id":3359655,"url":"https://alion.io/job/rtx-sr-software-engineer-modeling-and-simulation-onsite","title":"Sr Software Engineer, Modeling and Simulation Onsite","company":{"id":1162,"name":"RTX","domain":"rtx.com","url":"https://alion.io/company/raytheon-technologies","size_band":"5000+","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Workday","truth_index":{"grade":"B","score":81,"open_postings":442,"ghost_share":0,"stale_share":0.742,"repost_share":0.014,"time_to_fill_p50_days":29,"computed_at":"2026-11-03T05:54:40Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Dulles, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":95500,"max":181700,"currency":"USD","period":"year","gross":null,"usd_annual":181700},"salary_estimate":null,"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Agile","optional":false},{"name":"Azure DevOps","optional":false},{"name":"Bitbucket","optional":false},{"name":"GitHub","optional":false},{"name":"GitLab","optional":false},{"name":"NumPy","optional":false},{"name":"Pandas","optional":false},{"name":"Plotly","optional":false},{"name":"PyQt","optional":false},{"name":"Pytest","optional":false},{"name":"Python","optional":false},{"name":"Scrum","optional":false},{"name":"Azure","optional":true}],"status":"live","first_seen_at":"2026-10-27T20:51:48Z","employer_posted_date":"2026-10-27","last_verified_at":"2026-11-03T23:58:13Z","board_verified":true,"closed_at":null,"days_open":7,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":7},"description":"Date Posted:\n2026-10-27\n\nCountry:\nUnited States of America\n\nLocation:\nUS-VA-DULLES-710 ~ 22110 Pacific Blvd ~ BLDG 10\n\nPosition Role Type:\nOnsite\n\nU.S. Citizen, U.S. Person, or Immigration Status Requirements:\nThe 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\n\nSecurity Clearance Type:\nTS/SCI with Polygraph\n\nSecurity Clearance Status:\nActive and existing security clearance required after day 1At 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.\nRaytheon 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.\nRaytheon’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.\nThis is an onsite role located in Dulles / Sterling, VA, Richardson, TX, McKinney, TX, or Aurora, CO.\nWhat You Will Do\nDesign, develop, and implement new features for Python-based applications focused on modeling and simulation.\nCollaborate with cross-functional teams across multiple time zones to deliver innovative solutions.\nConduct code reviews to ensure adherence to coding standards and best practices.\nOptimize and maintain the existing codebase for performance and efficiency.\nSupport the software development lifecycle, including requirements gathering, design, implementation, unit testing, and system testing.\nParticipate in Agile development process, providing regular updates on progress and status.\nDocument software artifacts, including design documents, test procedures, and developer notes.\nQualifications You Must Have\nTypically 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.\nExperience with Python programming and scripting.\nExperience 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.\nExperience with code hosting and version control tools, such as Bitbucket, GitHub, GitLab, or Azure DevOps.\nExperience in the software development lifecycle, including requirements, design, implementation, unit testing, and system testing.\nThe 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.\nQualifications We Prefer\nExperience with automated testing frameworks, such as PyTest.\nExperience with statistics, statistical modeling (e.g., logistic regression, Bayesian models), and/or data distribution fitting (e.g., normal, lognormal, Weibull).\nFamiliarity with simulation modeling and analysis, including Discrete Event Simulation.\nExperience working with distributed teams across multiple time zones.\nExperience with Agile/Scrum software development methodologies.\nWhat We Offer\nOur 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.\nLearn More & Apply Now!\nOnsite: 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.\n 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 \nLocation Info and/or Links: \nDMV: https://careers.rtx.com/global/en/raytheon-dmv-location \nNorth Texas: https://careers.rtx.com/global/en/raytheon-north-texas-location \nAurora, CO: https://careers.rtx.com/global/en/raytheon-aurora-co-location #LI-RH2\nAs 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.\nThe salary range for this role is 95,500 USD - 181,700 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.\nPrivacy Policy and Terms:\nClick on this link to read the Policy and Terms","description_format":"text","description_chars":7684,"description_truncated":false,"requirements":{"experience_years_min":5,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":{"level":"bachelor","optional":false},"security_clearance":true,"languages":[]},"benefits":["Flexible schedule","Life insurance","Parental leave"],"hiring_locations":[{"name":"United States","iso":"US","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Missiles","Air Defense","Defense Manufacturing","Avionics & Flight Control"],"lifecycle":[{"event":"open","at":"2026-10-27T20:51:48Z"}],"visa":[],"liveness":{"score":63,"band":"ok","label":"Likely open","p_open":1,"p_active":0.632,"p_room":1,"age_days":6,"expected_fill_days":29,"reasons":["conf:4","stale_co","velocity","win:early","comp:brand"],"computed_at":"2026-11-03T05:54:40Z"},"pay":{"stated_usd_annual":181700,"is_top_pay":true},"html_url":"https://alion.io/job/rtx-sr-software-engineer-modeling-and-simulation-onsite","json_url":"https://alion.io/job/rtx-sr-software-engineer-modeling-and-simulation-onsite.json","meta":{"generated_at":"2026-11-04T01:18:03Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","about":"Alion is a live layer of people, companies and AI agents: who they are, whether they are real and active right now, what they do and how to work with them, readable by people and by agents and paid per call.","catalog":"https://alion.io/catalog.json","usage":{"tier":"crawler_verified","counted_by":"address","units_charged":1,"used_today":1970,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-11-05T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.02,"usd":0.002,"plus_per_slice":{"credits":0.05,"usd":0.005}},"unit":"per company, plus each slice with data","note":"the employer in depth","call":{"mcp_tool":"get_company","arguments":{"id":1162},"rest":"https://alion.io/mcp/rest/get_company?id=1162"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Frtx-sr-software-engineer-modeling-and-simulation-onsite"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":1,"usd":0.1},"unit":"per slice","note":"pay, demand and time to fill for this role and place","call":{"mcp_tool":"market_stats"},"human":"https://alion.io/catalog?offer=market.stats&for=job%2Frtx-sr-software-engineer-modeling-and-simulation-onsite"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.02,"usd":0.002},"unit":"per posting in a list","note":"similar open postings","call":{"mcp_tool":"search_jobs"},"human":"https://alion.io/catalog?offer=job.search&for=job%2Frtx-sr-software-engineer-modeling-and-simulation-onsite"},{"id":"company.verify","title":"Is this company real and active right now","status":"pilot","price":null,"unit":"per company","request":{"url":"https://alion.io/catalog/request","method":"POST","body":"{\"offer\": \"company.verify\", \"for\": \"job/rtx-sr-software-engineer-modeling-and-simulation-onsite\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Frtx-sr-software-engineer-modeling-and-simulation-onsite"}],"agent":{"mcp":"https://alion.io/mcp/jobs","mcp_open":"https://alion.io/mcp/open","next":[{"tool":"get_job","arguments":{"id":3359655}},{"tool":"search_jobs","arguments":{"company":"rtx.com","detail":"compact"}},{"tool":"match_people","arguments":{"job_id":3359655},"note":"people open to offers who fit this vacancy"}],"note":"The same data through MCP tools: https://alion.io/mcp/open needs no sign-in (compact searches, postings, people); https://alion.io/mcp with an Alion account has everything. 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