Senior Applications Engineer

About Us

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.

A Day in the Life

We're looking for a Senior Applications Engineer to join our Portland, ME office. As a key member of the team, this position will report to the Director of Applications Engineering. You will join as senior member of our global applications engineering (AE) team, focused on responding to customer and internal requests for the development of proposals throughout North America and Australia. The compensation range for this role is $105,000 to $150,000, in addition to an annual bonus, commensurate with experience, skills, and geographic location.

To thrive in this role, you’ll be comfortable taking ownership of the following responsibilities:

• Deliver high-quality technical solutions and proposals that drive profitable growth, ensuring clear priorities, accountability, and strong team performance.
• Serve as a key member of the leadership team by informing commercial strategy, identifying product and market growth opportunities, and improving proposal win-rate and speed-to-customer.
• Partner closely with sales, design engineering, process SMEs, operations, project delivery, safety, procurement, and key vendors to align technical solutions with commercial goals, maintain accurate cost data and ensure consistent execution across stakeholders.
• Maintain awareness of competitor offerings, positioning, and market trends to inform strategy development and support increased market share.
• Ensure organized and complete handoff from proposals to project execution following contract award.
• Direct and coordinate technical reviews for bid requests, contributing to risk evaluation and bid/no-bid decisions.
• Partner with procurement and key vendors to maintain accurate, current cost data for standard and custom equipment pricing.

Your Skills and Expertise

These requirements reflect the knowledge, skills and abilities that help you do your best work here.

• BS Engineering or equivalent technical degree required
• 8+ years of experience as an applications engineer, process engineer, project engineer, project manager, or related role
• 5+years of experience in water treatment process systems solutions
• Professional Engineer license preferred, not required
• Possess persuasive presentation and effective communication skills-both verbal and written-across cultures required
• Willingness and ability to travel 10% of the time, both domestically and internationally required
• Experience pulling teams together to formulate winning bids
• Ability to adapt strategy to meet customer needs
• Understanding of business, competitive landscape, legal/regulatory environment, needs/challenges of customers

Onterris is a leading global environmental solutions company partnering with organizations to solve complex challenges where environmental pressures, regulatory expectations and operational risks intersect. Guided by our mission to advance the way of life without compromising the integrity of our environment, we believe environmental responsibility and human progress are fundamentally connected. Our scientists, engineers, field teams and consultants apply systems thinking that unites science, data and practical expertise to deliver solutions that strengthen our clients’ resilience, mitigate risk and protect the air, water and soil that sustain communities, while uncovering responsible paths forward for planet and progress. For more information, visit

We are an equal opportunity employer and encourage applications from people of all backgrounds. We acknowledge that these experiences and perspectives help to enrich our teams and contribute to our ongoing success. We are committed to providing access and reasonable accommodation in our employment for all applicants. For US residents, click here to learn more.

"Working with inspiring coworkers and clients across the globe over the past five years has been incredibly rewarding. Their passion motivates me to improve our client experience and work that I deliver." – Erin Peck, Emissions Services

"There are not many places where a toxicologist can be boots‑on‑the‑ground at an environmental emergency one day and deep in a human health risk assessment or litigation the next, but this company is one of them, and honestly, that breadth is what makes me love the work. We are a team of scientists with a broad range of talents and experiences who genuinely take the mission to heart, because protecting people and communities from chemical hazards is not abstract here; it is exactly why we show up every day. The culture reflects that shared commitment in the best way: collaborative, rigorous, and truly motivated by the impact we make together." – Andre Richardson, Consulting

"I knew my position here would be more than just a job. Every day is a new, exciting challenge to solve, and I get to go home knowing that the work I am doing is having a positive impact on the world." – J Esteves, R&D