The Sistema Team

Joe Vallejo

Joe Vallejo

President of Sistema Technologies

Joe has lived most of his life in San Antonio, TX, as most San Antonians’ he is an avid Spurs fan! Joe is a father of two children, daughter, Victoria, and son, Joe. Joe is also a graduate of Texas A&M Corpus Christi.

Joe is President and CEO of Sistema. He is a 20-year veteran of the technology business, with hands on experience handling all the business aspects of running an IT business.

John Lujan

John Lujan

Vice President of Sales

John has lived most of his life in San Antonio, TX, living on a small ranch in San Antonio’s Southside. He is the father of five boys, John IV, Jacob, Jesse, Christopher and Michael. He has been married to his wife of 34 years, Freda. Most recently, John was aformer member of the Texas House of Representatives, representing District 118 from 2016 to 2017. In 2012, John retired from the San Antonio Fire Department. As a former firefighter of 25 years, John’s interactions with the community has always focused on one question, ” How can I help you?” That sentiment has carried over into how he works with Sistema clients.

With Sistema, John is a co-founder of the company and Vice President of Sales. John has over 20 years experience in the IT consulting business.

Ernesto Cantu

Ernesto Cantu

Director of Business Development

Ernesto has been crucial to the success of Sistema Technologies' business growth strategies and is committed to developing and maintaining an excellent account and customer relationship. With over 18 years of experience, Ernesto has created winning business strategies for the past 5 years with Sistema's State of Texas customer base, including HHSC, TxDOT, TEA, OAG, CPA, OCCC, TWDB, TCEQ, ERS, TXDMV, TABC, THECB, GLO, TMD, City of Austin, Austin Energy to mention a few. In addition, Ernesto's role as Director of Business Development has exemplified Sistema's core value of a strong customer service attitude.

Deana Coleman

Deana Coleman

Operations Manager

Deana Coleman is an Operations manager with 4 years of experience working alongside the executive team at Sistema Technologies. Deana specializes in finance and administration and is responsible for keeping her boss in line. Deana values integrity, transparency and is committed to doing what is best for our clients, consultants, teammates and company. Deana is inspired daily by her family and friends. In her free time, you can find her at the gym or home with family and her fur baby.

Monica Espinoza

Monica Espinoza

Business Development Manager

Monica Espinoza is the Business Development Manager for Sistema Technologies. She has worked with Sistema Technologies since August 2019. In her first project, Monica took a lead role in providing technical training to Texas Department of Transportation (TxDoT) for the implementation of new software deployed in the 25 district offices across the state. In addition, she was instrumental in establishing and successfully growing the first in-house Service Operation Center. Monica prides herself in leading projects that are cost effective for both the firm and their clients while making sure that she meets the needs of the clients she services in both the financial and IT industries.


Prior to joining the Sistema team, Monica served in wide variety of roles for a large non-profit in San Antonio. She led the training and development initiatives for over 700 staff of the organization. She was responsible for the deployment and training of several software implementations that were used throughout the organization.


Monica attributes her success to the relationships that she has established through the years. She has a genuine care for people and has a heart to serve. Her success has been dependent on the successes of others.


Monica is a native to San Antonio and a graduate of the University of the Incarnate Word where she graduated with both her Bachelor and Masters in Organizational Development and Leadership. She is married to her husband James and they have 3 beautiful children Marissa (23), Madeline (19), and Andrew (18). In her spare time Monica enjoys being outdoors and spending time with her friends and family.

Liz Flores-Perez

Liz Flores-Perez

SVP Recruiting

Liz began her recruiting career while attending The University of Texas at Dallas and quickly became a recognized recruiting leader for National Consulting firms in the Dallas market; winning numerous prestigious awards throughout her career.

Originally from Eagle Pass, TX and raised in Dallas, Liz relocated to San Antonio and joined Sistema Technologies in 2013 as the AVP of Recruiting and is currently our SVP of Recruiting. In this role, she actively manages our recruiting team across our U.S. and nearshore/offshore offices. Her extensive recruiting experience has enabled her to mentor recruiters to operate at a high level of integrity and precision when matching client requirements to candidate skill sets.

During her personal time, Liz enjoys spending quality time with her family; her husband and their 5 children. She loves “Friday Night Lights” and cheering on her favorite NFL Team – The Dallas Cowboys. Her son Austin is an Autistic Young Adult and she actively helps him face challenges he encounters; Liz is very passionate about Autism Speaks and helping special needs children/adults. She also supports Peer Advocacy – Students who look-out for other students and prevent bullying against students with disabilities.

crossmenu