The answer is simple: They were all project based jobs. Simply focus on the projects you worked on, name some keywords to describe them. Project finished with contractor A, then comes next project with employer B, and so on.

The answer is simple: They were all project based jobs. Simply focus on the projects you worked on, name some keywords to describe them. Project finished with contractor A, then comes next project with employer B, and so on. No one will ask why you switched after a successful project.

Isn't there also a field on LinkedIn under each job to describe the projects you worked on?