Commissioning Engineer

Ecolab; Witterswil; On-site; CHF 90,000 - 140,000; Full time

Job summary

Ecolab, Inc. is seeking a Commissioning Engineer to perform start-up and commissioning of Ultrapure Water plants at customer sites, with extensive international travel (100%).

The role requires technical degrees and hands-on commissioning experience to achieve final UPW quality specs. You will collaborate with project managers, verify installation integrity, load process media, and execute IQ, OQ, and FAT per project demands.

Qualifications

• Technical graduate education in Chemical or Mechanical Engineering.
• Strong understanding of continuous process systems in regulated environments.
• Hands-on experience in commissioning, start-up, operation, maintenance, or technical service roles.
• Ability to troubleshoot complex systems with analytical thinking.
• Fluent in English; German/French an advantage.
• Swiss or EU citizenship or valid Swiss work permit.

Responsibilities

• Collaborate with Project/Construction Managers to track progress against project milestones.
• Introduce water into UPW system and verify installation integrity via pressure testing.
• Load and commission media and equipment (ion exchange resins, RO, UF, UV).
• Perform system flushing and conditioning to meet UPW specs.
• Manage wastewater during commissioning with stakeholders.
• Lead IQ/OQ/FAT activities per project/quality requirements.
• Provide plant training to customers on process fundamentals and procedures.
• Complete final plant certification and support handover to customer.
• Prepare commissioning documentation including test results and deviations.
• Diagnose and resolve start-up/commissioning technical issues.
• Adhere to site Health & Safety regulations.

Skills

Troubleshooting

Analytical thinking

Intercultural collaboration

Strong communication

Fluent English

Education

Bachelor's or Master in Chemical/Mechanical Eng

Tools

IQ/OQ/FAT procedures

Pressure testing

Job description

The Commissioning Engineer is responsible for performing commissioning and start-up for use of Ovivo proprietary Ultrapure Water (UPW) plants equipment. He/she will be responsible for starting-up equipment in the plant to reach the final UPW quality specification.

The company is based in Witterswil, Solothurn (Basel Area), Switzerland. The role is based directly on customer site and requires (100%) international travelling.

HowYou’llMake an Impact:

• Collaborate closely with Project Managers and Construction Managers to track progress against the approved project schedule and commissioning milestones.
• Introduce water into the ultrapure water (UPW) treatment system and verify mechanical installation integrity through pressure testing.
• Load and commission process media and equipment, including but not limited to ion exchange resins, reverse osmosis and ultrafiltration membranes, and UV systems.
• Perform system flushing and conditioning activities to achieve final UPW quality specifications.
• Manage and monitor wastewater generated during commissioning, coordinating with relevant internal and external stakeholders to ensure safe, compliant, and efficient operation.
• Participate in coordination, progress, and technical meetings with customer representatives as required.
• Execute Installation Qualification (IQ), Operational Qualification (OQ), and Functional Acceptance Testing (FAT) in accordance with project and quality requirements.
• Provide comprehensive plant training to customers, covering process fundamentals, operational procedures, and best practices.
• Complete final plant certification and support formal handover to the end customer.
• Prepare and maintain detailed commissioning documentation, including test results, deviations, root causes, and corrective actions.
• Diagnose, troubleshoot, and resolve technical issues encountered during system start-up and commissioning.
• Ensure strict adherence to site Health & Safety regulations and safe working practices at all times.

Qualifications:

• Technical graduate education (bachelor’s degree or master’s degree) in Chemical Engineering, Mechanical Engineering, or a closely related technical discipline.
• Strong understanding of continuous process systems, ideally within gas, water, pharmaceutical, or other regulated industrial environments.
• Proven hands-on experience in commissioning, start-up, operation, maintenance, or technical service roles.
• Demonstrated ability to troubleshoot complex systems, supported by strong analytical thinking and structured problem-solving skills.
• Ability to effectively prioritise a high-volume workload while remaining flexible and responsive to rapidly changing site conditions.
• Excellent interpersonal and intercultural skills, with a proven ability to work collaboratively in multidisciplinary and international teams.
• Proactive and self-driven approach, with the confidence and sound judgement to make independent technical decisions when required.
• Clear and professional communication skills; able to represent the company on-site and serve as a trusted interface with customers.
• Fluent in English (working language); proficiency in German and/or French is a strong advantage.
• Swiss or EU citizenship, or possession of a valid Swiss work permit.

About Ecolab:

At Ecolab, we prioritize our talent-first philosophy by creating the most capable and diverse team to excel at ournearly threemillion customer sites. Building on a century of innovation, our 48,000 associates help deliver comprehensive science-based solutions, data-driven insights and world-class service to advance food safety, maintain clean and safe environments, and optimize water and energy use, and improve operational efficiencies and sustainability for customers in the food, healthcare, life sciences, hospitality and industrial markets in more than 170 countries around the world. Our solutions not only enhance operational efficiency but also contribute to sustainability and public health, making a positive impact on the world. We are committed toeliminatingunnecessary complexities and embracing a beginner’s mindset, continuously seeking new perspectives and innovative solutions to stay ahead in a rapidly changing world.

Ecolab’s commitment to diversity,equityand inclusion (DE&I) reflects our longstanding value of working together to integrate diverse perspectives to challenge ourselves, reach our goals and dowhat’sright.

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