In this panel, we will present with concrete examples how 5G networks are embracing SDN, disaggregation and open source and thus represent opportunities for researchers to contribute and shape the future of mobile cellular networks. It is now possible to program the control plane and the forwarding pipeline of RAN, mobile core, and front-haul, back-haul, and backbone networks on servers, NICs, switches and middle-boxes. The panel will present a network architecture blueprint to set up a private 5G network leveraging CBRS spectrum with end to end softwarized network/RAN elements to further innovate on. This represents a really exciting and unprecedented opportunity for the research community. The panel also shines a light on technical challenges that a researcher has to be prepared for: learn the latest software development tools and practices and to be able to work with real systems to have an impact on the evolution of 5G towards next G and beyond.