Senior Field Service Technician

Senior Field Service Technician

At Onterris, we build careers grounded in purpose, responsibility and real-world impact.

“For Planet and Progress” is our north star that guides everything we do. We believe environmental responsibility and human progress are interconnected, interwoven and international. Our scientists, engineers, field teams, consultants and professionals collaborate across disciplines and geographies, guiding industries and governments, ensuring that communities and environments thrive. When you join us, you’re not just forging a career, you’re joining a movement.

A movement for better thinking, smarter solutions and lasting impact. Together, we will advance our way of life and protect the integrity of our environment every step of the way.

This position is based in Portland, ME
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The annual compensation range for this role is $80,000-$90,000 commensurate with experience, skills, and geographic location.

Reporting to the Field Services Project Manager, this role will be responsible for a full range of activities including:

• Leads and independently performs complex field engineering and technical activities, including equipment inspections, startup and commissioning support, fabrication progress evaluations, vendor and supplier site audits, construction inspections, field verification measurements, site assessments, troubleshooting, and comprehensive data collection efforts.
• Serves as a technical lead in the field by coordinating with clients, contractors, vendors, and project teams to ensure compliance with project specifications, quality standards, safety requirements, and operational objectives.
• Performs operations and maintenance (O&M) of various types of environmental treatment equipment including pumps, filters, tanks, pressure vessels, and other types of process unit operations.
• Poses a general understanding of system hydraulics, mechanical operation/functionality and instrumentation/electrical control schemes.
• Supports fabrication activities, as well as hands‑on set‑up of bench and pilot testing equipment.
• Executes piping/skid fabrication in the shop and field, troubleshoots and repairs mechanical and electrical system issues or failures.
• Collects samples using a variety of sampling methods and operates field monitoring equipment including but not limited to PID/FID, pH, EC, DO, GEM, turbidity, water level, and LEL meters.
• Measures and records treatment operational data by carefully documenting monitoring and testing results on field forms and prepares field daily reports and data sheets.
• Conducts field monitoring, sampling, testing, and basic evaluations; maintains chain‑of‑custody documentation and regulatory sample handling protocols; and records inspection data in electronic spreadsheets and reports.
• Ensures proper labeling and handling of hazardous material and waste.
• Exercises safe work practices by following all Company safety rules and OSHA regulations, including attendance at all required safety training programs.
• Communicates promptly with Project Managers and various stakeholders to inform of site conditions and activities.
• Interacts with clients acting as a front‑line representative of the company, presents a professional appearance, and wears appropriate PPE on job sites.
• Participates in the company’s continuous improvement programs and provides support to team efforts.
• Keeps up‑to‑date and current on industry trends by completing formal training.
• Performs other duties as assigned.

• High School Diploma or equivalent.
• 5+ years of experience performing mechanical/electrical troubleshooting, environmental collection, monitoring, sampling, testing and basic evaluation.
• Must possess a valid Class C driver’s license with a clean…