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About OSM Consultants

Committed to Excellence

OSM Consultants was established in 2002 by husband and wife duo, Sebastian and Shorley Mariner. The company started in a humble home office with a borrowed computer and an ambitious dream: To raise the standard of service industries in Samoa.


These two founders were fueled by two fundamental dreams: Sebastian was determined to build the future of Samoa, so he became a Civil Engineer. Shorley had a heart for championing the Samoan community and connecting those from the grassroots to government level, so she became a Social Safeguards Expert. Together, the duo built OSM Consultants, a business that would build not only a nation but develop communities and champion its people.


As the two founders thought about a company name and vision, 'OSM Consultants' rose to the fore. OSM is an acronym for the first and last names' of the Owners as well as that of their two daughters: Olisana and Okalani (O), Sebastian and Shorley (S), Mariner (M) - a testament to their heart for legacy.


The founders' commitment to excellence and their strong Christian faith became the foundation upon which OSM Consultants was built. To this day, legacy, excellence, innovation, partnership and integrity remain the core values for their business success.



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Our Team​

In OSM, we believe that our team is our family: we work hard, support and celebrate one another and strive to

build the nation of Samoa together. If you are interested in work experience or employment opportunities our Internship Programme will partner you with one of our senior engineers or supervisors for 3 months.



You will get hands-on experience working in various industry sectors and learn how to coordinate tasks across multiple infrastructure-related projects in Samoa.


We look for candidates who are teachable, collaborative and have a good understanding of the English and Samoan language


If you are interested in applying for our Internship Programme, email Shorley Mariner with a cover letter, resume and short background on yourself. Apply now and be part of a fun, innovative and dynamic team.


UN Small-Island Developing States' (SIDS) Conference 2014


"Throughout OSM's tenure, I found the company, through Managing Directors Vui Sebastian and Shorley Mariner and their team, to be outstanding professionals with commitment to excellence, integrity and a great sense of responsibility. I am deeply satisfied with OSM's work and our relationship throughout this project and happily commend their services to anyone."

Fa'alava'au Perina Sila

CEO and National Coordinator, 3rd United Nations SIDS Conference (2014)


Contact Us

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OSM HQ Lotopa

PO Box 2199, Apia, Samoa

© 2018 by OSM Consultants

Created by THE HUB SAMOA