Ir. Jimmy Priatman, M.Arch., IAI - Ir. Jusuf Wikono, HAKI - Ir. Pius A.S Atmadja, M.T., IAI - Ir. Ratna S Alifen,M.C.E, HAKI

Ir. Ratna S. Alifen, M.C.E , HAKI Ratna S. Alifen is a structural engineer and serves as Director of Finance since 1988. She graduated from Petra Christian University Surabaya in 1978 and received her Master of Civil Engineering degree from Illinois Institute of Technology, Chicago in 1996. She has been involved in various projects of the firm and her professional area of expertise is structural engineering and construction management. She is a professional member of the Indonesian Society of Civil and Structural Engineers and also lectures at Petra Christian University Surabaya.