Senior Mechanical/Process Engineer

W3Global; Huntington Beach (CA); On-site; USD 110,000 - 160,000; Full time

Job summary

W3Global is seeking an experienced Senior Mechanical/Process Engineer to design and support custom reverse osmosis and water treatment systems for marine, municipal, industrial, and commercial applications. The role spans the full project lifecycle from process design to field commissioning.

Responsibilities include equipment sizing, P&ID development, and collaborating with production, suppliers, and customers. Travel for commissioning and service is expected as needed.

Qualifications

• Bachelor's degree in Mechanical, Chemical, Environmental, or related engineering.
• 7+ years of relevant engineering experience preferred.
• Experience with reverse osmosis, desalination, industrial water treatment, process equipment, packaged systems, or similar equipment preferred.
• Strong understanding of pumps, piping, valves, pressure vessels, instrumentation, and process equipment.
• Ability to read and develop P&IDs and engineering drawings.
• Experience taking engineered equipment from design through fabrication and commissioning.
• Strong troubleshooting and problem-solving abilities.
• Willingness to travel periodically for commissioning, service, and customer support.

Responsibilities

• Design reverse osmosis, desalination, filtration, and packaged water treatment systems.
• Develop and review P&IDs, process calculations, equipment specifications, and bills of material.
• Size and select pumps, membranes, pressure vessels, filters, valves, instrumentation, piping, and related equipment.
• Review customer specifications and develop compliant technical solutions.
• Support preparation of technical proposals and customer clarification responses.
• Work directly with production personnel during system fabrication and testing.
• Develop FAT procedures and participate in or lead factory acceptance testing.
• Support installation, startup, commissioning, and troubleshooting at customer sites.
• Work directly with customers, suppliers, contractors, and internal teams to resolve technical issues.
• Maintain and improve engineering standards, calculations, documentation, and design practices.
• Document legacy systems and support continued development of standardized designs.
• Provide technical support for field service and existing equipment.

Skills

Troubleshooting

Problem-solving

Communication

Documentation

Project management

Education

Bachelor's degree in Mechanical, Chemical, Environmental, or related engineering

Tools

AutoCAD

Job description

Senior Mechanical/Process Engineer - Water Treatment Systems

About The Job

Our client is seeking an experienced Mechanical/Process Engineer to join their engineering team focused on designing and supporting custom reverse osmosis and water treatment systems for marine, military, municipal, industrial, and commercial applications. This is a hands-on engineering role with responsibility throughout the complete project lifecycle - from initial process design and equipment selection through fabrication, factory testing, commissioning, and field troubleshooting.

Responsibilities

• Design reverse osmosis, desalination, filtration, and packaged water treatment systems.
• Develop and review P&IDs, process calculations, equipment specifications, and bills of material.
• Size and select pumps, membranes, pressure vessels, filters, valves, instrumentation, piping, and related equipment.
• Review customer specifications and develop compliant technical solutions.
• Support preparation of technical proposals and customer clarification responses.
• Work directly with production personnel during system fabrication and testing.
• Develop FAT procedures and participate in or lead factory acceptance testing.
• Support installation, startup, commissioning, and troubleshooting at customer sites.
• Work directly with customers, suppliers, contractors, and internal teams to resolve technical issues.
• Maintain and improve engineering standards, calculations, documentation, and design practices.
• Document legacy systems and support continued development of standardized designs.
• Provide technical support for field service and existing equipment.

Qualifications

• Bachelor's degree in Mechanical, Chemical, Environmental, or related engineering discipline.
• 7+ years of relevant engineering experience preferred.
• Experience with reverse osmosis, desalination, industrial water treatment, process equipment, packaged systems, or similar equipment strongly preferred.
• Strong understanding of pumps, piping, valves, pressure vessels, instrumentation, and process equipment.
• Ability to read and develop P&IDs and engineering drawings.
• Experience taking engineered equipment from design through fabrication and commissioning.
• Strong troubleshooting and problem-solving abilities.
• Comfortable working directly with production personnel and customers.
• Ability to independently manage engineering assignments and priorities.
• Strong communication and documentation skills.
• Willingness to travel periodically for commissioning, service, and customer support.

Preferred Experience

• Experience with seawater RO, marine equipment, military/government projects, municipal water treatment, electrical controls, PLC-based systems, or AutoCAD is a plus.

What We're Looking For

We are looking for an experienced engineer who enjoys working on real equipment and managing projects beyond calculations and drawings. The successful candidate will be comfortable moving between engineering design, production environments, customer meetings, factory testing, and field commissioning. This position offers substantial technical responsibility and the opportunity to become a key member of an experienced engineering and manufacturing organization.

Compensation & Benefits

Compensation: Depending on experience