The Royal Society Te Apārangi Early Career Researcher (ECR) forum represents researchers in Aotearoa New Zealand across various research sectors encompassing Crown Research Institutes (CRIs), Industry Training Organisations (ITOs), and universities to better support ECR career development. Despite recommendations to integrate these research sectors, the system is still segmented with rising numbers of PhD graduates, limited post-doctoral opportunities, and challenges associated with a changing research system. Recent efforts, including funding reforms and new fellowship schemes, aim to address these issues but remain insufficient. This paper highlights ongoing disparities and the need for a framework that fosters ECR mobility and professional growth. It calls for strategic reforms in training and funding systems, supporting integrated pathways, equitable opportunities, and fostering of ECRs across diverse research environments.