Our Team

Our team is our greatest asset – Spiral consists of a highly qualified multidisciplinary team of civil engineers, licensed Professional Engineers (P.E), MSc graduates, ITs and Technicians lead by Alfredo Diego and Elisa Muela. It is with the dedication and versatility of our team that we can deliver an outstanding service, satisfy our clients and grow as a company.

Alfredo Diego Abascal

Alfredo Diego Abascal

General Manager


Alfredo Diego graduated as MSc Civil Engineer from the University of Cantabria in 1987.


After graduating, Alfredo joins APIA XXI structures team, working in the design of concrete and steel structures for bridges and building structures. In 1992, he commenced his career within the highway and railway fields.


From the year 2000, Alfredo holds the position of Technical Director of the company, successfully managing a wide and multidisciplinary team to develop large infrastructure projects in national and, since 2005, international markets.

During his 30 years of experience, Alfredo has participated in some of the most relevant projects developed in Spain within the last decades, as well as projects in The United States, Latin America and Asia.


Since 2000, he also managed the Administration and Finance Department of the company, which additionally offered services to a variety of companies linked to the civil engineering and renewable energy markets.


In May 2017, Alfredo joins Spiral as General Manager of the company.

Elisa Muela Carriles

Technical Director


Elisa Muela graduated in Mathematical Science from the University of Cantabria in 1992.


Her career begins in January 1992 when she joins APIA XXI as part of the linear works division team, and starts her roadway design expertise.


In 2000, Elisa is upgraded to lead the Roadway Design Department and since 2007 she holds the position of Head of Linear Works Division of the company.


Elisa has actively taken part in the design process of more than 250 roadway and railway projects worldwide, delivering to both public and private clients.

Elisa Muela Carriles


It must be noted her outstanding expertise achieved since 2010 in projects within The United States, ranging from the development of tender projects and study of alternatives to the design of large and complex detail projects.


In January 2017, Elisa establishes Spiral as a company, in which she holds the position of Technical Director.