Senior Process Mechanical Engineer

Job Description

Overview 

We are seeking an experienced Senior Process Mechanical Engineer, Power specializing in combined cycle power plant design to join our growing Power engineering team. This role is ideal for a technically strong and highly motivated engineer who thrives in multidisciplinary project environments and is passionate about delivering high‑quality engineering solutions. The preferred location is Bothell, WA with flexibility for hybrid or remote work arrangements.

This position supports engineering execution for new and existing power generation facilities, including simple‑cycle and combined‑cycle plants, and requires strong technical knowledge in thermodynamics, heat transfer, fluid systems, and equipment specification.

Your role 

• Perform mechanical engineering design for combined cycle and simple cycle power generation systems, including equipment sizing, system modeling, and development of P&IDs.

• Lead and direct the mechanical engineering team assigned to a project to deliver high‑quality power project designs while ensuring effective coordination, technical accuracy, and schedule requirements.

• Collaborate closely with multi‑discipline engineering teams, clients, and external partners to ensure project technical success.

• Prepare calculations, schematics, technical documentation, and design deliverables with clear assumptions and references.

• Develop equipment specifications for pumps, heat exchangers, pressure vessels, compressors, boilers, cooling systems, and balance‑of‑plant components.

• Support proposal development, cost estimation, and project execution planning as needed.

• Coordinate with equipment vendors, review submittals, and respond to technical inquiries.

• Maintain a strong commitment to quality assurance, safety, and compliance with applicable codes and standards (ASME B31.1, ASME BPVC, NFPA, HEI, API, etc.).

• Provide occasional field engineering support, including site visits, inspections, testing oversight, and construction support.

About you 

• Bachelor’s degree in mechanical or chemical engineering or related discipline from an ABET‑accredited program.

• Professional Engineer (PE) license preferred.

• Minimum of 10 years of engineering experience, preferably in power generation or industrial facilities.

• Experience in engineering design services and project execution within the energy sector is strongly desirable.

• Experience preparing and checking P&IDs, equipment specifications, and mechanical design deliverables.

• Experience or desire to work with design tools such as AFT Fathom, AFT Arrow, GT Pro, Steam Pro, and Thermoflex.

• Strong understanding of thermodynamics, heat transfer, and fluid flow with specific experience in combined cycle plant performance, HRSG systems, steam turbine cycles, and gas turbine auxiliary systems.

• Ability to clearly communicate complex technical concepts to colleagues, suppliers, and clients.

• Flexibility to manage workload across multiple projects while upholding safety and quality standards.

• Proficiency in pipe sizing, flow calculations, and modelling of compressible/incompressible systems.

• Familiarity with piping materials, valves, control valves, and relief valve design.

• Commitment to mentoring, team collaboration, and maintaining strong professional relationships.

Rewards & benefits 

At AtkinsRéalis, our values—Safety, Integrity, Collaboration, Innovation, and Excellence—are more than just words. They are the foundation of who we are and how we work. These principles shape our culture, guide our decisions, and inspire us to create an environment where every team member feels empowered to grow, succeed, and make a meaningful impact. 

Depending on your employment status, AtkinsRéalis benefits may include medical, dental, vision, company-paid life and short- and long-term disability benefits, employer-matched 401(k) with 100% vesting, employee stock purchase plan, Paid Time Off, leaves of absences options, flexible work options, recognition and employee satisfaction programs, employee assistance program, and voluntary benefits. You can review our comprehensive benefits page here.  

About AtkinsRéalis 

We're AtkinsRéalis, a world-class engineering services and nuclear organization. We connect people, data and technology to transform the world's infrastructure and energy systems. Together, with our industry partners and clients, and our global team of consultants, designers, engineers and project managers, we can change the world. We're committed to leading our clients across our various end markets to engineer a better future for our planet and its people. 

Find out more.  

Additional information 

Are you ready to expand your career with us? Apply today and help us shape something extraordinary.

AtkinsRéalis is an equal opportunity, Drug-Free employer EOE/Veteran/Disability 

Please review AtkinsRéalis’ Equal Opportunity Statement here. 

AtkinsRéalis cares about your privacy and is committed to protecting your privacy. Please consult our Privacy Notice on our Careers site to know more about how we collect, use and transfer your Personal Data. By submitting your personal information to AtkinsRéalis, you confirm that you have read and accept our Privacy Notice.

Note to staffing and direct hire agencies: 

In the event a recruiter or agency who is not on our preferred supplier list submits a resume/candidate to anyone in the company, AtkinsRéalis family of companies, we explicitly reserve the right to recruit and hire the candidate(s) at our discretion and without any financial obligation to the recruiter or agency. https://careers.atkinsrealis.com/recruitment-agencies

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At AtkinsRéalis, we seek to hire individuals with diverse characteristics, backgrounds and perspectives. We strongly believe that world-class talent makes no distinctions based on gender, ethnic or national origin, sexual identity and orientation, age, religion or disability, but enriches itself through these differences.