Engineering Consulting & Support (ECS) Inc. was founded by Agus Widjaja and his associates in 2017 in Irvine, CA.  ECS’s business goal is providing full service mechanical electrical and plumbing (MEP) engineering consulting to architects, contractors, and building owners; as well as supporting other MEP firms in Revit 3D modeling, Title 24 energy calculations, peer review, etc. ECS Inc holds quality and customer service as its highest priorities.  Top quality and competitive fees are what ECS strives for.   ECS intends to remain a small firm and to serve few clients in the region.  The leaders in ECS believe in long term working relationships rather than short term profits.

Come Meet Us Upclose

Irwan Yowanto, PE, LC, RCDD

Partner and  Principal (Electrical)

Irwan Yowanto graduated from California State Polytechnic University at Pomona in 2001 with a Bachelor of Science degree in electrical engineering.  Irwan is an expert in lighting and power design, but he is also very knowledgeable in low voltage, fire alarm, and network.  His portfolio spans K-12, data centers, healthcare, critical facilities, and higher-ed.

Irwan is also the founder and principal of his own electrical engineering consulting firm – Yowanto Engineering Inc. Yowanto Engineering has been operating successfully for the past seven years.  Prior to that, Irwan served as a vice principal and project manager at CWA & Associates Inc. for eight years.  Irwan is married to his wife of many years.

James Rae PE

Senior Advisor (Mechanical and Plumbing)

James Rae has been a mechanical engineer longer than most of us have lived. He is a licensed engineer in the states of California, Arizona, Washington, Nevada, Utah, and Arkansas.  He has more than 47 years of HVAC design experience under his belt ranging from roof top package system to very large central plant system.  For years, he was a principal managing large projects in many parts of the United States.  He is not only knowledgeable in design but also in construction management.  Jim Rae prides himself in delivering well engineered and cost effective designs.

Jim held various senior positions throughout his career.  One of which is as a partner of Toft Wolf Farrow from 1997 to 2010.

Choy Palo

Associate Principal (Plumbing)

Choy Palo has over 20 years of experience in plumbing design.  Right after completing his studies at Mt. San Antonio College in architectural technology in 1997, he has been diligently pursuing his career in plumbing design.  His experience spans healthcare, K-12, office space, retail, commercial restaurant, and mix-use high rise residentials.  Some of his outstanding work can be seen on the portfolio page on this website. For the past decade, Choy has led a team of designers as a Project Manager and head of a Plumbing Department. In addition, he is also a hands on designer and is highly experienced with BIM and CAD design.

Choy also received his plumbing design certificate from UCLA in 1998, and is currently working on his CPD and LEED certifications.  He is a member of ASPE (American Society of Plumbing Engineers).

Agus Widjaja

Founder and Principal (Mechanical) 

Agus Widjaja received his Bachelor of Science degree in mechanical engineering from the University of Missouri at Rolla in 1983. He has 12 years of experience in construction in Asia, and 20 years of experience in HVAC consulting in California.  Agus is not only knowledgeable in HVAC design and California codes, he is also skilled in CAD,  BIM, and other engineering programs. His knowledge in design and ability to put together complete design packages allows him to check the design quality from A to Z, and ensures that every submittal that leaves the office is according to what the clients have expected.

Agus is a member of ASHRAE.  To keep his HVAC knowledge up to date and his mind sharp, he takes part in ASHRAE seminars, online courses, and learns computer programming.