Description At Walmart, we are transforming connectivity in Mexico through our digital ecosystem. We are looking for a Principal Engineer to lead the architecture and evolution of our MVNO platform , ensuring a robust, scalable operation ready for the future of telecommunications ( 5G and cloud-native ). This role will be responsible for strengthening internal mobile core capabilities, reducing dependency on external vendors, and driving strategic technical decisions with direct business impact. Key Responsibilities Design and optimize the mobile core architecture , including signaling flows (Diameter, GTP, SIP, SS7) Ensure the proper operation of charging and policy systems (OCS / PCRF / PCF) to secure revenue and network control Lead the transition toward cloud-native architectures (Kubernetes, containers, CNFs) Define technical integration standards with network partners (MNO, IPX/GRX, vendors) Ensure network readiness for 5G Standalone (SA) Identify technical risks, optimize proces...