A contract of mandate (umowa zlecenie) is a civil-law agreement in which the contractor is paid for performing the agreed tasks with due diligence, not for a specific result. Labour Code provisions such as paid leave do not apply, and the scope of social and health insurance depends on the contractor's status — students under 26, for example, are exempt from contributions.
For people who value flexible hours and place of work — students, part-timers and those taking on project-based cooperation where flexibility matters more than the stability of a permanent position.