Code ownership is a major issue as engineering teams scale.Builders are responsible for implementing features, but code ownership typically falls to someone else.Different builders repeatedly reinvent the wheel, wasting time and resources.Shared code ownership without collaboration leads to confusion on responsibility and a tedious development lifecycle.Microservices can help address code ownership issues, but they are not always the best solution for every organization.Builders must take responsibility for creating sustainable, high-quality code.Co-ownerships, with one team owning the foundation and others embracing collaboration, can be a solution.Team collaboration is crucial, especially for projects with tight deadlines.Owners and co-owners should be respected by builders, and vice versa.It is crucial to take care of code assets and maintain high-quality, sustainable code.