Senior Process Engineer

Asa senior process engineer, you will be under guidance of more senior engineers and will be involved in the design, optimization and continuous improvement of ultra pure water and industrial wastewater treatment systems.

JoiningEcolab means being part of a global team of innovative and passionate professionals who are committed to preserving water, our planet's most critical resource. It also means combining our efforts and talents towards a more sustainable future – together.

The role is based inWitterswil, Solothurn, Switzerland and will require some international travelling.

How You’ll Make an Impact:

Main responsibility: Support capital projects from concept through commissioning:

• Design, calculate and optimize processes in the fields of ultrapure water and wastewater treatment, including:
• Filtration, activated carbon filters, advanced oxidation processes
• Reverse osmosis, ion exchange,  EDI, UF/MF
• Degasification, UV oxidation, TOC reduction
• Chemical treatment, biological treatment, ZLD systems
• Develop and review process flow diagrams (PFDs), piping and instrumentation diagrams (P&IDs), mass balances, and equipment specifications for major equipment items
• Generate technical specifications for packaged units, process equipment
• Participate in design reviews and clarifications at the early stages of process and basic engineering works
• Generate process description and logic documents for complex water and wastewater  treatment systems
• Participate in HAZOP, FMEA and safety review or assessment
• Work closely within the other engineering department and support project managers on project activities
• Prepare documentation for submission and support project team on plant start-up, performance test, optimization and hand-over.
• Support project team on commissioning activities, performance test, optimization, troubleshooting and hand-over
• Provide training to the end customer operation and maintenance teams

Other responsibilities:

• Provide technical support to the Ecolab operation and maintenance teams (training, guidance)
• Troubleshoot process upsets and contamination events
• Monitor system performance and water quality parameters (e.g., resistivity, TOC, silica, metals)
• Conduct audit of a running system and provide audit report
• Work closely with the innovation teams to develop new processes and digital tools

Qualifications

• Master’s degree or engineering school graduate in Chemical Engineering, Environmental Engineering, Mechanical Engineering, or related field
• Bachelor’s degree with strong experience in UPW and /or wastewater treatment for semiconductor industry will be considered
• Require minimum 5 years experience with good knowledge in process control, water and waste water treatment systems.
• Experience in regulated or high‑purity industries (semiconductor, pharmaceuticals, biotech, energy...)
• Strong understanding of water chemistry and treatment processes
• Ability to interpret process data and laboratory results
• Analytical thinking & problem-solving skills
• Ability to work independently and in cross‑functional teams
• Self-initiative and creativity, flexible and able to work under pressure
• Strong communication and technical documentation abilities for collaboration with internal international departments, suppliers and customers
• Mobility and willingness to travel worldwide, including extended trips
• English proficiency for daily business; German, French or other languages are an added value
• Swiss or EU citizenship or a C Swiss resident permit

What's in it for you:

• A competitive salary
• Flexible working hours
• Being part of an international team with travel opportunities
• Engage with cutting-edge ultrapure water technology for the electronics industry in a state-of-the-art technology centre in Switzerland
• Always new challenges to solve
• Entry date with immediate effect or by mutual agreement
• At Ecolab we are committed to providing working environments where everyone is included and treated fairly and with respect

Dive in – Apply Today! Let’s change the future of water together.

Careers Advancing Ovivo Ultra-Pure Water+ by Ecolab’s Water Technology Solutions

Help shape the future of water and technology by joining a team that drives innovation in ultrapure water solutions —critical to industries powering global progress. These careers offer the chance to make an impact that matters solving complex challenges, collaborating across borders, and creating solutions that protect vital resources. If you’re passionate about water circularity, sustainability and technology, explore opportunities where your expertise fuels advancement and your growth is supported.

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