O presente artigo intenta sistematizar as formas ou regimes do emprego público em países da União Europeia e da OCDE. A metodologia compreende a análise dos tradicionais sistemas de carreira (career-based system) e sistema de emprego (position-based system) no emprego público. Desenvolvem-se, ainda, breves reflexões nas mudanças operadas naqueles dois regimes que migraram para um terceiro modelo, vulgarmente designado por modelo híbrido de emprego público, mais flexível e mais correlativo às circunstâncias do século XXI.This article intends to systematize the forms or systems of public employment in EU countries and the OECD. The methodology includes the analysis of traditional career systems (career-based system) and the employment system (position-based system) on public employment. We Develop, yet, concise reflections on the changes occurred in those two schemes that have migrated to a third model, commonly called a hybrid model of public employment. This model reveals more flexible and correlative to the circumstances of the twenty-first century.