This paper presents a methodology for implementing Industry 4.0 technologies in the context of the customer life cycle, specifically targeting Small and Medium Enterprises (SMEs). The methodology is designed to help software engineers in SMEs create new software services that improve customer interactions and experiences. The methodology includes stages divided into phases, each consisting of activities. It emphasizes the use of semantic descriptions and 3D visualization in the implementation of new services. The second contribution is a system developed for a real manufacturing scenario, using the proposed methodology, which allows observing the possibilities of such systems in two phases of the customer life cycle: Discover & Shop and Use & Service. The methodology is based on two pillars: semantic-based technology for representing knowledge related to manufactured products and 3D digital technology for visualizing those products. Semantic technologies, such as ontologies, allow the representation of knowledge in a formal and reusable way, facilitating interoperability between information systems. 3D rendering technologies allow detailed visualization of objects, enhancing user experience. These technologies are combined in the proposed methodology to create new software services that improve customer interactions and experiences. The methodology includes stages such as defining objectives and goals, building semantic descriptions, building 3D visualization, architecture design, implementation and testing of customer services, and deployment in production and maintenance. The methodology is applied in a real manufacturing scenario, Urola Solutions, where three services are developed to improve the customer life cycle: a product catalogue, a searching module, and a virtual technician. The services are implemented using the proposed methodology, which includes semantic descriptions and 3D visualization. The results show that the proposed methodology can help SMEs implement Industry 4.0 technologies in the context of the customer life cycle, improving efficiency and enhancing customer experiences.This paper presents a methodology for implementing Industry 4.0 technologies in the context of the customer life cycle, specifically targeting Small and Medium Enterprises (SMEs). The methodology is designed to help software engineers in SMEs create new software services that improve customer interactions and experiences. The methodology includes stages divided into phases, each consisting of activities. It emphasizes the use of semantic descriptions and 3D visualization in the implementation of new services. The second contribution is a system developed for a real manufacturing scenario, using the proposed methodology, which allows observing the possibilities of such systems in two phases of the customer life cycle: Discover & Shop and Use & Service. The methodology is based on two pillars: semantic-based technology for representing knowledge related to manufactured products and 3D digital technology for visualizing those products. Semantic technologies, such as ontologies, allow the representation of knowledge in a formal and reusable way, facilitating interoperability between information systems. 3D rendering technologies allow detailed visualization of objects, enhancing user experience. These technologies are combined in the proposed methodology to create new software services that improve customer interactions and experiences. The methodology includes stages such as defining objectives and goals, building semantic descriptions, building 3D visualization, architecture design, implementation and testing of customer services, and deployment in production and maintenance. The methodology is applied in a real manufacturing scenario, Urola Solutions, where three services are developed to improve the customer life cycle: a product catalogue, a searching module, and a virtual technician. The services are implemented using the proposed methodology, which includes semantic descriptions and 3D visualization. The results show that the proposed methodology can help SMEs implement Industry 4.0 technologies in the context of the customer life cycle, improving efficiency and enhancing customer experiences.