Senior Principal Mechanical Engineer

WorleyParsons; Long Beach (CA); On-site; USD 165,000 - 243,000; Full time

Job summary

Worley is seeking a Senior Principal Mechanical Engineer to lead project execution in the Long Beach/Monrovia area. You will mentor engineers, develop technical solutions, and ensure safe, efficient project outcomes across multidisciplinary teams.

This role requires 8+ years in petrochemical/refinery settings, strong English communication, and experience with refinery specifications. Travel to vendor facilities may be required; salary ranges are commensurate with experience.

Qualifications

• Thorough knowledge of theories, practices, and accepted office procedures.
• Typically, minimum of 8 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.
• Knowledge of API, ANSI, NEMA, ASTM specifications.

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 vendors on 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 Equipment deliverables.
• Will be required to develop/support hour estimation, TIC estimates, deliverable requirements and personnel loading for the Rotating Engineering scope of the project.
• Able to support or fill in for the Mechanical lead as requested.

Skills

Engineering experience

Mechanical equipment experience

English communication

Refinery specifications

Power/CCUS/Arctic experience

Education

BS or MS in Mechanical Engineering

Job description

Job Description - Senior Principal Mechanical Engineer (LON03EF)

Senior Principal Mechanical Engineer - LON03EF

Company : Worley

Primary Location

USA-CA-Long Beach

Job

Mechanical

Schedule

Full-time

Employment Type : Employee

Job Posting

Sep 9, 2026

Unposting Date

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 onEquipmentdeliverables.
• Will be required to develop/support hour estimation, TIC estimates, deliverable requirements and personnel loading for theRotating 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 berequired 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 local laws, including the City of Los Angeles' Fair Chance Initiative for Hiring Ordinance.”

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Moving forward together

We want our people to be energized and empowered to drive sustainable impact. So, our focus is on a values-inspired culture that unlocks brilliance through belonging, connection and innovation. We're building a diverse, inclusive and respectful workplace. Creating a space where everyone feels they belong, can be themselves, and are heard.

And we're not just talking about it; we're doing it. We're reskilling our people, leveraging transferable skills, and supporting the transition of our workforce to become experts in today's low carbon energy infrastructure and technology. Whatever your ambition, there's a path for you here.

And there's no barrier to your potential career success. Join us to broaden your horizons, explore diverse opportunities, and be part of delivering sustainable change.