The Onyx Team

Meet Us

Nicole Caya-Winfield


Nicole has spent the last decade building Onyx based on the principles of quality and tenacity. As its CEO and President, she is involved in all facets of the Company. Responsible for all operations including project management, accounting, pre-qualification, procurement, construction performance and expansion potential, Nicole maintains open communication with all employees providing the tools for peak performance.

Nicole is a graduate of the University of San Diego and holds Onyx’s C-9 Contractors License. She is certified as a Safety Trained Supervisor of Construction (STSC), LEED Green Associate, and maintains her OSHA 30 Certification and CPR.

Gilbert Miranda


Gilbert has spent the last 50 years in the construction industry. Proving himself as an apprentice and later graduating to run work for a variety of companies, he laid the foundation for future success. In 1984 Gilbert started his own business that he later incorporated in 1990. Known as Mirstone Plastering, his company thrived for 30 years as an innovative leader in the field of Lath and Plaster. Gilbert served on the Board of Directors for the Associated Plastering and Lathing Contractors of San Diego from 1991-2005. He also served as their President and currently performs inspections for the Association.

Kurtis Bullard

Project Manager/Estimator

Kurtis has spent the last 23 years in the construction industry. Beginning as an apprentice and journeying out in 2000, he has a direct understanding of operations and lath systems. Kurtis' expertise makes him an invaluable member of the Onyx Building Team. He has been recognized as a Certified Building Envelope Technician and Building Envelope Specialist for Air and Moisture Barrier and Thermal Barriers through the Carpenters International Certification Council (CCIC). Through his dedication to his work and his clients, Kurtis provides the expertise to get the job done efficiently and effectively.

Kurtis also holds a GPRO Certificate in Fundamentals of Building Green and Construction Management and a Collaborative Leadership Certificate through the United Brotherhood of Carpenters.

Claudia Garcia

Office Manager

Claudia has spent the last 15 years in construction. Bilingual and well versed in daily operations, she maintains Onyx's payroll, certifications, and supports its employees. She is extremely dedicated and adapts to all situations, job requirements, and tasks with ease. Claudia's previous employment with both Soltek and Webcor make her a very qualified and diverse woman in her field.

She currently maintains her CPR and State of California Federal Public Works 101

Brian Miranda


With over 19 years of estimating and project management experience Brian is the qualifier for Onyx’s C35 Contractors License. Thorough and detail oriented, Brian is meticulous in his takeoffs. His responsibilities include evaluation of bid specs, drawings, follow up, project knowledge and a comprehensive analysis of the project tasks to execute.

Prior to his work with Onyx Brian worked in the field for Mirstone Plastering and later for SoCal Commercial Exteriors. He currently maintains his OSHA 10 Certification.

Eric Miranda

Project Manager/Estimator

With over 20 years of experience in the construction Industry, Eric has been recognized as an Industry Expert in Lath and Plaster by the California State License Board. As a product specialist, he has been called out as an Inspector for the Associated Plastering and Lathing Contractors of San Diego where he sat as President from 2011-2013.


Prior to joining Onyx, Eric was the President of SoCal Commercial Exteriors where he oversaw the day to day operations of his venture which continued his family’s legacy of plaster expertise and quality. Eric also holds Air Barrier Association of America (ABAA) Quality Assurance Professional and Certified Installer Certificates. He is listed as a Certified Commercial Installer for DuPont Tyvek Air Barrier and Fluid Applied Membranes. He maintains his OSHA 10 certification and is a Certified Installer for Dryvit, Omega, Senergy, Sto, and is a Parex Medallion Applicator. He also holds a C35 and B Contractors License.

Rick Boyd

Lathing Superintendent

With over 35 years in construction, Rick is considered an expert in his field. He grew up in the Lath industry and began full-time work at 18 years old. Knowledgeable in both residential and commercial building, Rick is versatile and understands what is required to execute the projects at hand. Rick has previously held the roles of General Superintendent, Operations Manager, and Business Owner. His diverse background and exceptional expertise make him an asset to the Team and an impeccable resource.

He holds a C35 License and maintains his OSHA 30, CPR, Scaffold Erection and is GHS Trained.

Jorge Villegas

Plaster Superintendent

Jorge has been in the construction industry for the last 47 years and has the knowledge and experience needed to execute each project effectively and efficiently. He has dedicated his career to plaster and began working as a young man in the field. He has worked for a variety of firms and his efforts and performance have made an impact at each. Jorge is committed to achieving the best finish possible and continually provides support and guidance to Onyx's employees- maintaining a standard of performance far exceeding industry expectations.

He maintains his OSHA 30, CPR and his GHS Trained.

Luke Uetrecht

Project Engineer/Junior Estimator

Luke has been with Onyx for the past year and has experience working both in the field and within the office. As a recent graduate of the University of San Diego (with a Bachelors degree in Engineering), Luke is very technical-minded and technologically gifted in programs such as OST, Bluebeam, Plan Grid and Office Suite. Luke provides a fresh face and positivity in his everyday tasks and contributes new-school methodology to the job site.

He currently maintains his OSHA 30.

Our Staff

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555 Raleigh Ave El Cajon, CA 92020 | P: (619) 324-1440 F: (619) 324-1441
Department of General Services Small Business Certification # 1547520 (exp 2/28/19)
California Public Utilities Commission Woman-Owned Business Certification # 14040093 (exp 7/17/19)
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