Senior Process and Piping Design Engineer

Position Overview

Senior Process and Piping Design Engineer – Bellevue, WA – Confidential client. This role focuses on the design of experimental‑scale systems for an advanced liquid‑fueled reactor system, progressing to larger demonstration‑scale plant design activities. Assignment length: 12 months. Benefits include three insurance levels, 401K + match, and paid sick leave. Eligibility: U.S. citizens or those authorized to work in the U.S. (work sponsorship not available).

• Develop System Design Descriptions, Interface Control Documents, Process Flow Diagrams (PFDs) and Piping & Instrumentation Diagrams (P&IDs) to define system requirements.
• Design piping layouts, select materials, and perform stress analyses to ensure system integrity using Auto Pipe.
• Prepare and review technical drawings (isometrics, orthographics, general arrangements), specifications, material lists, and vendor documents.
• Ensure designs adhere to relevant industry codes (ASME B31.1, B31.3), standards (ANSI, ASTM, IEEE, NFPA), and regulatory requirements (DOE, NRC).
• Collaborate with multidisciplinary teams (thermal hydraulics, instrumentation & controls, mechanical design, construction contractors) to integrate piping designs into the overall project.
• Conduct technical reviews of supplier designs, deliverables, and performance.
• Ensure design quality and compliance through participation in reviews, inspections, audits, and testing.

• B.S. in Mechanical or related discipline from an accredited university and 12+ years of direct experience with proven mechanical systems skills.
• Demonstrated experience in the design and analysis of industrial mechanical systems, structures, and equipment.
• Recent experience with piping analysis software (Auto Pipe preferred or Caesar).
• Proficiency in CAD software (Solidworks and AutoCAD preferred).
• In‑depth knowledge of piping components such as valves, fittings, and supports.
• Experience in high temperature and multi‑discipline integration (highly desired).
• Previous experience with nuclear reactors, nuclear handling process systems, or similar high‑performance system or equipment design (highly desired).
• Excellent technical writing, communication, and presentation skills.
• Attention to detail and aspiration for technical excellence.
• Candidate must be a self‑starter and possess ability to work independently with minimal direction.
• Ability to handle projects that include many competing objectives and constraints, with ability to resolve conflicts between objectives.
• Ability to work on simultaneous tasks that require a multi‑disciplinary approach.
• Experience working to quality standards on design activities, such as ASME NQA‑1 or ISO 9001 (highly desired).
• Strong communication skills desired.
• The service provider will possess a high degree of trust and integrity, communicate openly and display respect, and a desire to foster teamwork.

$67.00‑$110.00 per hour. All experience levels considered.

Hansell Tierney is one of the premier staffing and recruiting companies in the Pacific Northwest. Launched in 2001, we are a woman‑owned business that serves and staffs Northwest organizations by doing things the right way, not just the easiest way. Hansell Tierney partners with candidates and clients to match the best candidates with interesting local opportunities. We navigate every relationship with the highest level of discretion and service while holding ourselves accountable to our promises.

Our business thrives on our deep understanding of the job market and our ability to skillfully tailor our recruitment process to meet our clients' unique needs.

Hansell Tierney participates in E‑Verify and will provide the federal government with your Form I‑9 information to confirm that you are authorized to work in the U.S. If E‑Verify cannot confirm that you are authorized to work, this employer is required to give you written instructions and an opportunity to contact the Department of Homeland Security (DHS) or Social Security Administration (SSA) so you can begin to resolve the issue before the employer can take any action against you, including terminating your employment.

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