GitHub shares insights from the three-year development journey of GitHub Copilot, an AI tool that aids developers in coding. The process involved identifying a specific problem, iterative product development with user feedback, and scaling the application for general availability. The team prioritized enhancing existing tools, reducing task-switching, and ensuring secure and responsible AI use. The experience underscores the importance of focusing on a specific problem, integrating user feedback, and prioritizing user needs as the application scales.