The present work aims to develop an improvement proposal to reduce the operating costs of the company Inversiones Postes Sánchez S.A.C. The various factors and causes that affect it were analyzed; Also, the economic impact it causes on the company was recognized. Among the main factors and causes evaluated that generate large losses we have: a bad production work methods, personnel not trained in the production of CAC poles, there is no control and planning of maintenance of equipment and machines in the area of production of poles and poor control of their environment and work environment. The engineering methodologies proposed in this research are: QFD quality house, Failure Mode and Effects Analysis (FMEA), Six Sigma process improvement. These will allow us to: improve the operating process. Using a group of matrices that organize the knowledge of a company regarding customer requirements and product characteristics, evaluate all current and potential failures found in the productio n process of the company Postes Sánchez S.A.C. assigning them an RPN from the multiplication of the occurrence, severity and detection; and identify the variability of the data collected from the variables and attributes of the diagnosed causes. The results of the proposed engineering methodologies are: improvement of the current production work method, personnel development, control of materials in production and production planning. Likewise, the economic / financial evaluation of the proposal for improvement in maintenance management in the production process in the company Inversiones Postes Sánchez S.A.C. resulting in a positiveVan equal to S / .1417.70, with an IRR of 22.17% , recovering the total investment in 8.7 years.