Senior Geotechnical Engineer

At Mott Mac Donald, we trust our brilliant people to do brilliant things in engineering, management, and development services, supporting multisector project work in over 150 countries. As one of the largest employee‑owned companies in the world, we pride ourselves on our ability to deliver exceptional outcomes through our network of 20,000+ talented consultants. With sustainability and innovation at the heart of all our sectors in North America, including Buildings, Energy, Transportation, and Water.

We believe in empowering our people to excel, learn, and grow, offering diverse opportunities to contribute to career‑defining work. Join us and be part of a collaborative environment where your ambitions are united with ours, and you can truly shape your story.

If you share that vision, even if you don’t meet every requirement listed, we’d still love to hear from you. We value potential and diverse perspectives as much as experience. Let’s explore how we can support your growth and help you take the next step in your career, while contributing to an exciting new chapter for Mott Mac Donald in North America.

We are looking to appoint a Senior Geotechnical Engineer to strengthen our geotechnical capability across major infrastructure programs in the Pacific Northwest. This role sits within our Ground Engineering team, supporting both design delivery and owner’s advisory work on complex, large‑scale transportation and civil infrastructure projects.

Based in Seattle (hybrid), this is a senior, client‑facing position suited to someone with strong technical depth and established experience delivering across Washington and/or Oregon. The role also includes line management and mentorship responsibilities, with a clear pathway toward progression to Principal level.

You will play a central role in delivering major underground and surface infrastructure, spanning both technical design and advisory scopes. This includes working alongside owner organizations as an embedded advisor, supporting the delivery of complex programs involving tunnels, underground stations, elevated structures, and at‑grade assets in challenging ground conditions.

Alongside advisory responsibilities, you will contribute to a broader portfolio of geotechnical design work, collaborating across multidisciplinary teams to develop practical, high‑quality engineering solutions. The role offers exposure to long‑term regional programs and complex, multi‑package delivery environments, combining hands‑on technical input with strategic project support.

• Lead geotechnical analysis and design across all stages of project delivery, including foundations, excavations, retaining systems, slopes, embankments, ground improvement, and underground works.
• Provide technical leadership on complex geotechnical challenges, ensuring solutions are robust, efficient, and constructible.
• Support owner’s advisory services, including oversight of design, construction, and geotechnical risk management.
• Coordinate geotechnical inputs across multidisciplinary teams, aligning with project requirements, standards, and stakeholder expectations.
• Review calculations, reports, and design deliverables to ensure quality and compliance.
• Support the development and interpretation of geotechnical data, including instrumentation and monitoring programs.
• Engage with clients, agencies, and stakeholders to support delivery and strengthen working relationships.
• Contribute to proposals and business development activities across the region.
• Mentor and support junior engineers, fostering technical growth and knowledge sharing.
• Promote a strong health, safety, and engineering culture.

• Bachelor’s degree in Civil or Geotechnical Engineering (Master’s preferred).
• WA / OR PE license (or ability to obtain via reciprocity).
• 10+ years of experience in geotechnical engineering, with a strong track record on major infrastructure projects.
• Proven experience in geotechnical design for complex infrastructure, including underground works and geostructures.
• Experience working with public sector agencies in Washington and/or Oregon, with a demonstrated understanding of local codes…