Analyzing social networks formed by developers provides valuable insights for market segmentation, trend analysis, and community engagement. In this study, we explore the GitHub Stargazers dataset to classify developer communities and predict potential collaborations using graph neural networks (GNNs). By modeling 12,725 developer networks, we segment communities based on their focus on web development or machine learning repositories, leveraging graph attributes and node embeddings. Furthermore, we propose an edge-level recommendation algorithm that predicts new connections between developers using similarity measures. Our experimental results demonstrate the effectiveness of our approach in accurately segmenting communities and improving connection predictions, offering valuable insights for understanding open-source developer networks.