The postdoctoral phase at a higher education institution or non-university research institution in Hamburg generally serves to provide further academic qualifications to those awaiting appointment as a professor or a role in (academic) upper-level management. Postdoctoral positions are mostly limited in time – by definition, they are only intended to be transitional. Although you could theoretically accept one postdoctoral position after the next, the Academic Fixed-Term Labor Contract Act (Wissenschaftszeitvertragsgesetz, WissZeitVG) imposes certain restrictions: if your position is not funded externally, it is usually limited to six years after you have completed your doctoral studies. Thereafter, you should have permanent employment.
Possible steps after completing a postdoc include working as a junior professor or early career research group leader, or completing a Habilitation (postdoctoral qualification). But how can you finance the individual phases?