The management of modern telecommunications networks is complex, driving the adoption of Software Defined Networking (SDN). A typical SDN approach may rely on a monolithic architecture, with very strict resource requirements and a centralized database, that could lead to scalability issues in large-scale environments. This thesis faces these challenges by designing, implementing, and validating a new framework for network services orchestration based on cloud-native principles. The proposed architecture uses Git as a single source of truth and leverages GitOps workflow principles to translate high-level network service definitions into low-level device configurations, which are then applied to the targets using the gNMI protocol.