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Geant4 Jobs in Colorado (NOW HIRING)

Radiation Engineer II

Denver, CO · On-site

$95K - $130K/yr

Familiarity with radiation transport and shielding analysis tools (NOVICE, FASTRAD, GEANT4) * Familiarity with circuit simulation tools such as LTSpice or PSpice * Familiarity with space charging ...

Geant4 information

What is Geant4?

Geant4 is a software toolkit for the simulation of the passage of particles through matter, widely used in high energy physics, nuclear experiments, and medical physics. It allows scientists and engineers to model how particles interact with complex geometries and materials, helping to design detectors and optimize experiments. Written in C++, Geant4 provides a flexible and extensible framework for simulating physics processes such as electromagnetic, hadronic, and optical interactions. The toolkit is developed by an international collaboration and is open-source, making it accessible to researchers around the world.

What are the key skills and qualifications needed to thrive as a Geant4 simulation developer?

To thrive as a Geant4 Simulation Developer, you need strong proficiency in C++ programming, a solid background in physics or engineering, and experience with Monte Carlo particle transport simulations. Familiarity with the Geant4 toolkit, scientific computing libraries, and version control systems like Git is typically required, and advanced degrees or certifications in physics or related fields are highly beneficial. Analytical thinking, problem-solving skills, and effective collaboration are essential soft skills for excelling in this role. These competencies are crucial for developing accurate simulations, troubleshooting complex issues, and supporting research or engineering projects in scientific and medical domains.

What are some common challenges faced by Geant4 developers when integrating simulations into larger research projects?

One common challenge Geant4 developers encounter is ensuring seamless integration of complex simulations into multidisciplinary research environments, which often involve collaboration with scientists, engineers, and software teams. This typically requires adapting simulation outputs to match the data formats and analysis workflows of the broader project, as well as maintaining code compatibility with evolving software dependencies. Effective communication and a solid understanding of project requirements are crucial to address these challenges and to contribute meaningful results to the team’s goals.

What is the difference between Geant4 vs Medical Physicist?

AspectGeant4Medical Physicist
Required CredentialsPhysics or engineering degree, programming skillsPhysics or medical physics degree, certification (e.g., ABR)
Work EnvironmentResearch labs, simulation developmentHospitals, clinics, radiation therapy centers
Industry UsageParticle physics, radiation simulationMedical imaging, radiation therapy, diagnostics

While Geant4 focuses on developing and implementing physics simulations for research, Medical Physicists apply physics principles to diagnose and treat patients using radiation. Both roles require strong physics backgrounds, but their work environments and applications differ significantly.

What are popular job titles related to Geant4 jobs in Colorado?

For Geant4 jobs in Colorado, the most frequently searched job titles are:

What cities in Colorado are hiring for Geant4 jobs?

Cities in Colorado with the most Geant4 job openings:

Infographic showing various Geant4 job openings in Colorado as of August 2026, with employment types broken down into 95% Full Time, and 5% Contract. Highlights an 94% In-person, and 6% Remote job distribution.

Systems Engineer, Principal - Survivability & Nuclear Hardness

Lockheed Martin Corporation

Littleton, CO • On-site

Full-time

Medical, Dental, Vision, Life, Retirement, PTO

Re-posted 22 days ago


Lockheed Martin rating

8.1

Company rating: 8.1 out of 10

Based on 396 frontline employees who took The Breakroom Quiz

41st of 72 rated aerospace companies


Job description

Standard Job Description
Space is a critical domain, connecting our technologies, our security and our humanity.
While others view space as a destination, we see it as a realm of possibilities, where we can do
more - we can innovate, invest, inspire and integrate our capabilities to transform the future.
At Lockheed Martin Space, we aim to harness the full potential of space to cultivate innovation,
reduce costs, and push the boundaries of what technology can achieve. We're creating future-ready solutions, focusing on resiliency and
urgency through our 21st Century Security® vision. We're erasing boundaries and forming partnerships across industries and around the
world. We're advancing spacecraft and the workforce to fuel the next generation. And we're reimagining how space can connect us, ensuring
security and prosperity.
Join us in shaping a new era in space and find a career that's built for you.
As a Principal Systems Engineer and the authority in Survivability Engineering, you will support the System Engineering (SE) Special Disciplines and other integrated product area organizations in one or more of the following areas:
• Applying advanced concepts in electrical, electronics and physics disciplines to execute various tasks related to Survivability engineering specialty.
• Ensuring that military space vehicle and missile designs, from the component level to the system level, will meet performance requirements during and after exposure to specified environments, including natural space and man-made radiation environments.
• Conducting technical planning, specification requirements derivation, modeling and analysis, design, test planning and execution, documentation, requirements verification/validation to support overall system needs and act as technical consultant for management and customers
• Will join the enterprise Survivability Engineering group, will be partnered with other authorities, mentor and lead peers
• Serving in a key technical lead role, independently and leading other team members, in executing Survivability tasks, driving timely high quality results, while maintaining collaboration across both the Survivability team and the greater FBM program.
• Mentoring junior engineers within Survivability Engineering.
This position may require occasional travel at various periods of time based on program lifecycle and need for presenting material to Program or Customer.
The information below reflects the standard job description for this position:
Performs technical planning, system integration, verification and validation, cost and risk, and supportability and effectiveness analyses for total systems. Analyses are performed at all levels of total system product to include: concept, design, fabrication, test, installation, operation, maintenance and disposal. Ensures the logical and systematic conversion of customer or product requirements into total systems solutions that acknowledge technical, schedule, and cost constraints. Performs functional analysis, timeline analysis, detail trade studies, requirements allocation and interface definition studies to translate customer requirements into hardware and software specifications. For positions that perform IT responsibilities, use E646, Systems Engr-IT.
Basic Qualifications
• Experience in man-made Nuclear and Natural Space Radiation environments and in Nuclear Hardness and Survivability engineering
• Experience conducting radiation assessments and analyses
• Possesses technical knowledge, depth and breadth, related to spacecraft / missile development lifecycle and requirements compliance.
• Active or Current Secret Security Clearance with willingness/eligibility to obtain a Top Secret Security clearance; US Citizenship Required
Desired Skills
• Advance Degree in Nuclear Engineering, Computer Science, Computer Engineering, Electrical Engineering, Mechanical Engineering, Aerospace Engineering, or similar area of study
• 12+ years combined expertise in Natural Space Radiation and Man-Made environments and Engineering
• Experience with Radiation software tools (e.g., MCNP, NOVICE, Srim/Trim, Novice/Geant4, Creme96, Creme-mc, Shieldose, Spenvis, Omere, Ap8/Ap8, and Ap9/Ae9)
• Experience working in Radiation test facilities [e.g., test labs in universities such as University of California at Davis, Texas A&M, Indiana University Cyclotron Facility (IUCF), Brookhaven National Laboratory (BNL)]]
• Experience with Piece-part radiation testing, performance, and reliability
• Experience with Electrical Engineering simulation/modeling tools (e.g. PSpice, etc) and software tools for performing EE and mathematical analysis (e.g. Matlab, etc)
• Knowledge or experience in the following relevant subject areas: Propulsion, Ordnance, Mechanical Structures, Avionics Electronics, Navigation, Guidance & Control, Missile Performance, Materials & Processes, EEE parts, Flight Software, Reliability, Safety, Support Equipment
• Electronic, electrical, electromechanical and electrooptical (EEEE) components
• Experience working and collaborating with peers and senior material specialists from within and outside the engineering group
• Lead anomaly resolution teams
• Be organized and is able to effectively multi-task in a dynamic, fast paced environment
• Be recognized as an authority in systems thinking techniques with the demonstrated ability to apply them to a wide range of sophisticated problems and train others in their application
• Missile or space segment design and test experience with one or more subsystems or fields outside of Systems Engineering
• Experience with military and technical requirements/specifications
• Experience participating in major program reviews (SRR, PDR, ETC)
• Demonstrated ability to lead and work effectively in multi-functional teams, integration across teams, build strong professional relationships with team members and build consensus among peers
• Experience in briefing results to customers and senior leadership
• Active or Current Top Secret clearance
Pay Information
Full-Time Salary Range: $178500.00 - $331500.00
At Lockheed Martin, we know mission success starts with taking care of our people. Our Total Rewards program is designed to attract top talent, support your well-being, and help you grow-both professionally and personally.
The salary range for this position is as listed on the requisition. Please note that the salary information listed is a general guideline only. Lockheed Martin considers factors such as (but not limited to) scope and responsibilities of the position, candidate's work experience, education/ training, key skills as well as market(work location) and business considerations when extending an offer.
Benefits offered: Medical, Dental, Vision, Flexible work arrangements and schedules (e.g., 4x10), 401(k) match, Paid time off, Holidays, Parental Leave, EAP, Flexible Spending Accounts, Education Assistance, Life Insurance, Short-Term Disability, and Long-Term Disability.
  • Annual short-term and/or long-term incentive compensation programs may be offered depending on the position. Payments under these annual programs are not guaranteed and can vary from year to year and are tied to a range of performance metrics.
  • For (Washington state applicants only) Non-represented full-time employees: accrue at least 10 hours per month of Paid Time Off (PTO) to be used for incidental absences and other reasons; receive at least 90 hours for holidays. Represented full time employees accrue 6.67 hours of Vacation per month; accrue up to 52 hours of sick leave annually; receive at least 96 hours for holidays. PTO, Vacation, sick leave, and holiday hours are prorated based on start date during the calendar year.

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About Lockheed Martin

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As a global security and aerospace company, the majority of Lockheed Martin's business is with the U.S. Department of Defense and U.S. federal government agencies.The remaining portion of Lockheed Martin's business is comprised of international government and commercial sales of products, services and platforms.

Industry

Manufacturing

Company size

10,000+ Employees

Headquarters location

Bethesda, MD, US

Year founded

1912