About Us

Delivering quality engineering solutionsfor over 55 years.

Our Story

J&S was established in Puerto Rico in 1967 by Engineers Carlos R. Sierra Silva and Luis Jaca Méndez. Nowadays it is one of largest geotechnical services firm in the Caribbean covering the island of Puerto Rico, U.S. Virgin Islands, British Virgin Islands, Lesser Antilles and other locations within the Caribbean.

Our Mission

Our mission is to surpass our clients’ expectations in quality consulting on a timely manner and a extensive testing to aid design and our most treasured values of good service, practical reasoning and technical sagacity that has characterized Jaca & Sierra Testing Laboratories since its establishment 55 years ago.

Our Vision

Our vision is to maintain an efficient professional services entity comprised of customer service oriented, well trained and experienced team of geo-professionals and technical personnel provided with state of the art testing equipment and tools to complete the contracted tasks.

Meet the Team

Currently J&S employs a total of 50 technical and administrative personnel,
that includes geotechnical and laboratory engineers.