Linear's product and engineering teams detail their project management processes, emphasizing the importance of defining a project as a collaborative effort involving multiple people and lasting over two weeks. They use a high-level roadmap broken into themes and features, which evolve into projects, and stress the importance of clear project specifications to provide situational awareness. Project leadership is rotational among engineers, fostering autonomy and comprehensive skill development, while regular updates and Slack notifications ensure transparency and communication. Milestones are used flexibly to define project completion stages, and release readiness is determined through team consensus and feedback mechanisms like "feature roasts." Upcoming improvements include enhanced planning functionalities and an interactive feature for commenting on project updates.