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Nuclear Shielding and Criticality Engineer

Remote / Online - Candidates ideally in
Bellevue, King County, Washington, 98008, USA
Listing for: Protingent
Remote/Work from Home position
Listed on 2026-06-01
Job specializations:
  • Engineering
    Systems Engineer, Mechanical Engineer
Salary/Wage Range or Industry Benchmark: 69 - 115 USD Hourly USD 69.00 115.00 HOUR
Job Description & How to Apply Below
Job Description

Position Title: Nuclear Shielding and Criticality Engineer

Position Description: Protingent Staffing has an exciting contract Nuclear Shielding and Criticality Engineer opportunity.

Job Responsibilities:
  • Tasks are generally MCNP calculations formally documented in calculation packages.
Job Qualifications:
  • B.S. degree in Nuclear Engineering with 10+ years' experience
  • M.S. degree in Nuclear Engineering with 6+ years' experience
  • Ph.D. degree in Nuclear Engineering with 3+ years' experience
  • Strong MCNP skills and experience with performing radiation shielding calculations for both gammas and neutrons are required. Experience in criticality safety desirable.
  • Candidate should be familiar with variance reduction using MCNP, and features such as surface source read/write, mesh tallies, and weight windows. Familiarity with ADVANTG for weight windows generation is a plus.
  • Excellent written and verbal and communication skills required.
  • Ability and professionalism to work within published regulatory guidelines required.
  • Experience working under NQA-1 quality program desired.
  • Strong computational expertise desired.
  • Experience with Attila /Attila4MC and computed aided drafting (e.g., Solid Works, Space Claim/ANSYS, Cubit) is a plus.
  • Fast reactor experience a plus.
  • Strong programming skills in any language is a plus, and Python is commonly used in this position.
  • Knowledgeable or highly motivated to quickly learn basic nuclear reactor design concepts to meaningfully support engineering team.
  • Actual position starting level will be determined based on assessment of qualifications.
  • Travel Required:

    No travel required, 2 trips to home office/year recommended.
Job Details:
  • Job Type: Contract
  • Pay Rate Range: $69-$115/hr (Pay rates are approved based on candidate location, education and experience)
  • Location:

    Bellevue, WA or 100% Remote
  • Export control regulations require candidates to be a U.S. Citizen, U.S. Legal Permanent Resident, or of a protected person status
Benefits Package: Protingent offers competitive salaries, insurance plan options (HDHP plan or POS plan), education/certification reimbursement, pre-tax commuter benefits, Paid Time Off (PTO), and an administered 401k plan.
#Terra Pro
About Protingent: Protingent is an Award-Winning provider of top-tier Engineering and IT talent, trusted by companies at the forefront of innovation - from Software and Aerospace to AI, Clean Tech, Medical Devices, and Connected Technologies. We're passionate about making a positive impact by connecting exceptional talent with meaningful opportunities and helping our clients build the future.

Meet Your Recruiter

Haley Marsh
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