To have defended his/her PhD thesis before submitting the application.
To have identified a research structure and obtained the written agreement/support of the PI.It is also important to have already started collaborating with the PI/staff members of the structure as evidenced by one original publication/preprint and/or participation to a successfull grant/fellowship application. If the continuity of the initial host structure is note secured beyond 2 years (end of mandate, retirement of the PI, …), the candidate must also have identified a subsequent host structure and the written agreement of its PI.
For engineers willing to join the “Researcher” track, to have at least 5 years of seniority in the “Research Engineering” track.