SEAK is founded on the concept that collaboration between small firms and contractors is an efficient, cost-effective solution to producing exceptional designs and project outcomes. Synergy by definition denotes the interaction or cooperation of two or more organizations, substances, or other agents to produce a combined effect greater than the sum of their separate effects. SEAK has established a network of skilled and knowledgeable collaborators throughout the region that includes traffic engineers, surveyors, structural engineers, civil engineers, planners, attorneys and contractors. In house SEAK provides permitting and entitlements assistance to both novice and seasoned developers along with small community water and wastewater design.


To provide high-quality engineering and consulting services in a collaborative atmosphere that fosters creativity while protecting public health and safety.


We recruit locally from Montana State University and are growing a team that is passionate about preserving natural beauty while planning for the next generation. We encourage continuing education through local, regional, and national formats that broaden our staff’s creative abilities. We encourage our staff to be leaders in their respective disciplines while finding a positive work life balance.


SEAK is has had steady growth throughout the past decade and continues to invest in personnel, equipment, and innovate software solutions to optimize time management for both staff and clients. We continuously partner on project teams that will have lasting impacts on our community for decades to come.


SEAK is committed to working with individuals and groups who appreciate the lasting impact that developments have on both landscape and community. Moral and ethics are a deciding factor when accepting new clients. We strive to provide our clients high quality services that exceed those of a standard engineering firm.

Marlene Sadaj, PE


Marlene received her Bachelor’s degree in Civil Engineering from Boise State University in her home town of Boise, ID. She relocated to Bozeman in 2007 with her husband Josh Sadaj, a Butte, Montana native. Marlene worked as a Project Manager at Anderson Engineering until 2013 when she founded SEAK. SEAK and Anderson continue to work together on many projects within the Rocky Mountain region and here in Bozeman, Montana.

Marlene completed her Master’s in Civil Engineering with an emphasis is Construction Management at Montana State University while working full time and studying for her PE exams. She has maintained a strong relationship with MSU including accepting interim instructing positions with the College of Engineering for multi-disciplinary engineering design courses for several semesters. Marlene is also an active member of the community serving on the Gallatin County Parks Board, Wheatland Hill’s HOA Board, Big Sky Volunteer Ski Patrol and other various boards and committees.

Marlene has extensive background in site planning, water and wastewater design, project planning approvals and environmental permitting and compliance. Specializing in projects that are out of the ordinary that require creative solutions. She is currently licensed in four states: Montana, Idaho, Utah and South Dakota. Marlene has successfully taken many projects through final plat approval, conditional use approval, state and federal environmental approval and county approval processes. She has also completed wetland delineation training through Portland State University and frequently prepares 404 permits, 310 permits and local floodplain permits for clients. Marlene is proficient in the use of AutoCAD Civil 3D, HEC-RAS, Primavera, QuickBooks, and a multitude of other software programs.

Marlene has established a network of skilled and knowledgeable colleagues throughout the region that includes traffic engineers, surveyors, structural engineers, civil engineers, planners, attorneys and contractors.

When not practicing, Marlene enjoys spending time with her family, including her husband and two children, skiing at both Bridger Bowl and Big Sky Resort, mountain biking, running marathons, traveling and gardening.

Marlene Sadaj Pe Seak Engineering Firm

Nathalie Marshall, Pryde

Office Manager

Nathalie joined the SEAK family three years ago as our part-time Office Administrator. With a keen eye for detail and proactive approach, she efficiently manages payroll, client invoicing and bookkeeping, ensuring the smooth operation of our office. Her problem-solving skills and can-do attitude make her the go-to person for any task that needs to be accomplished.

Originally from Canada, Nathalie made the move to Bozeman 15 years ago from Maui Hawaii, where she successfully owned and operated a line of Natural Hawaiian Products and a Day Spa. Her entrepreneurial spirit and experience in running a business have enriched her skill set and approach to office administration.

Nathalie holds a Bachelor of Science in Business Administration and Management Information Systems. Her educational background, combined with her practical experience, equips her with a well-rounded understanding of business operations and management.

In her free time, Nathalie and her family enjoy the winter climate of Bozeman, particularly for the skiing opportunities it provides. Her passion for adventure and dedication to excellence make her an invaluable member of our team.

Nathalie Marshall Seak Engineering Firm

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