Senior Principal Mechanical Engineer

Job Description - Senior Principal Mechanical Engineer (LON
03EF
)

Senior Principal Mechanical Engineer - LON
03EF

Company :
Worley

USA-CA-Long Beach

Mechanical

Full-time

Employment Type

:
Employee

Sep 9, 2026

Oct 25, 2026

Reporting Manager Title :
Senior Specialist Mechanical Engineering

:

About us

Worley is a global company of energy, chemicals and resources experts headquartered in Australia. We partner with our customers to deliver projects and create value across the life of their assets. We specialize in consulting, engineering, procurement and construction across the project lifecycle, with services extending through to operations and decommissioning. Leveraging extensive experience and AI-enabled delivery, we support customers in navigating complexity as they meet today’s needs and transition to more sustainable solutions.

Purpose:

Join Worley’s Monrovia or Long Beach office as a Senior Principal Mechanical Engineer within the Mechanical Engineering Group
, where you’ll provide technical and leadership excellence across multidisciplinary projects. In this role, you’ll lead project execution and discipline deliverables, ensuring alignment with company and client procedures while driving continuous improvement in work processes. You’ll develop innovative technical solutions to complex engineering challenges, oversee and mentor a team of engineers, and support the successful delivery of safe, efficient, and high-quality project outcomes.
Responsibilities:

• The candidate will work within a team framework of other disciplines and will understand the broad organizational implications of the work being performed.
• Will be updating schedules and progress reports.
• May be asked to generate budgets for new work.
• Will be interfacing with Project Management and the Customers regularly.
• Will be required to develop/check specifications, data sheets, technical bids, purchase orders, resolve technical queries from vendorson various equipment, able to coordinate project requirements with other disciplines, project staff and clients.
• Will be required to maintain quality deliverables throughout the procurement of the equipment.
• Will be required to support work share activities with overseas offices on Equipmentdeliverables.
• Will be required to develop/support hour estimation, TIC estimates, deliverable requirements and personnel loading for the Rotating Engineeringscope of the project.
• Able to support or fill in for the Mechanical lead as requested.

What you will bring

Technical/Industry Experience and Qualifications Requirements:

• Thorough knowledge of applicable theories, practices, and accepted office procedures.
• Typically, minimum of8 years of Engineering experience in Petroleum-Chemical Industry.
• 5 years in Mechanical equipment or packaged equipment.
• Excellent written and verbal communication skills in English.
• Refinery specifications experience.
• Additional experience in the Power industry, Carbon Capture, or Arctic environment is valued.

Preferred Qualifications

• Knowledge of API, ANSI, NEMA, ASTM specifications.

Additional Information:

• Position located in the Long Beach or Monrovia, CA, Worley office locations.
• May be required to travel to the vendors facilities.
• Salary Range $164,917-$242,525 commensurate with experience and level of position.

Education – Qualifications, Accreditation, Training:

Required:

• BS or MS in Mechanical Engineering or equivalent.

Preferred:

• At least 15 years in petrochemical and refining with project design, execution, construction.
• On-site and/or in-refinery experience.
• Oil and Gas experience.

We will consider for employment all qualified Applicants, including those with Criminal Histories, in a manner consistent with the requirements of applicable state and…