Our Story

In 2006 husband and wife team Roger & Debra Hayes founded Sierra Technical Services, Inc. (STS) in Mojave, California as a woman owned small business. STS initial capability was to provide Aerospace Engineering and manufacturing for local aerospace and automotive industry leaders.


In 2015, STS relocated to a larger facility at the Tehachapi Municipal Airport (KTSP) in Tehachapi, California to expand capability in military aircraft programs, aerospace engineering services, and rapid prototype manufacturing as well as specialized test fixtures.

Strategically located in a region renown for aerospace innovation, STS leverages a network of highly experienced associate engineers, each with decades of design, manufacturing and testing expertise to meet emerging challenges.


Today, STS has approximately fifty full-time employees working several active programs to develop new aircraft concepts for a variety of customers.

5th generational aerial target badge

In March 2017, STS was awarded a prime contract to Build, Integrate, and Test the Fifth Generation Aerial Target (5GAT) air vehicle based on U.S. Government Design Data. Scheduled delivery of the 1st demonstrator aircraft is planned 1st Quarter 2020.Today, STS has approximately more than fifty full-time employees working several active programs to develop new aircraft concepts for a variety of customers.

STS is a Woman-Owned Small Business (WOSB) Aerospace Design, Engineering and Manufacturing company located at the Tehachapi Municipal Airport (KTPS) in Tehachapi, California.