Senior Geotechnical Engineer — Tunnels & Underground (Hybrid)

Mott MacDonald; Seattle (WA); Hybrid; USD 162,000 - 199,000; Full time

Benefits offered by this job

401k

Medical insurance

Dental insurance

Vision insurance

Short-term disability

Long-term disability

Paid holidays

PTO

Parental leave

Life insurance

Job summary

At Mott MacDonald, we are seeking a Senior Geotechnical Engineer to strengthen our capability across large infrastructure programs in the Pacific Northwest. The role is based in Seattle with a hybrid arrangement, combining client-facing leadership with line management and mentorship, offering a clear path toward Principal level.

You will work on tunnels, underground stations, and complex ground conditions, collaborating across multidisciplinary teams to deliver robust geotechnical design and

Qualifications

• Bachelor's degree in Civil or Geotechnical Engineering; Master's preferred.
• WA/OR professional license or ability to obtain via reciprocity.
• 15+ years of geotechnical engineering experience on major infrastructure projects.
• Geotechnical design for complex infrastructure, including underground works.
• Experience with public sector agencies in WA/OR and local codes.
• Ability to operate in a client-facing or advisory capacity.
• Strong grounding in soil/rock mechanics, geotechnical analysis, and ground-structure interaction.
• Proficiency with PLAXIS, GeoStudio, RS2/RS3, Civil 3D, BIM tools.
• Experience leading technical delivery and risk management.
• Strong communication and leadership, including mentoring.

Responsibilities

• Lead geotechnical analysis and design across all stages of project delivery, including foundations, excavations, retainingsystems, 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.

Skills

Geotechnical leadership

Civil/geotechnical engineering

Client-facing

Mentoring

Project delivery

Soil & rock mechanics

Ground improvement

PLAXIS

GeoStudio

RS2/RS3

Civil 3D / BIM tools

Education

Bachelor's degree in Civil or Geotechnical Engineering

Master's degree preferred

Tools

PLAXIS

GeoStudio

RS2/RS3

Civil 3D

BIM tools

Job description

At Mott MacDonald, we are seeking a Senior Geotechnical Engineer to strengthen our capability across large infrastructure programs in the Pacific Northwest. The role is based in Seattle with a hybrid arrangement, combining client-facing leadership with line management and mentorship, offering a clear path toward Principal level.

You will work on tunnels, underground stations, and complex ground conditions, collaborating across multidisciplinary teams to deliver robust geotechnical design and