Guilherme practises in the field of labor law and has extensive experience advising companies and organisations on individual and collective labor law matters. He has expertise in strategic litigation and collective bargaining, with an emphasis on the comparative analysis of the regulatory frameworks of Portugal, Germany and the European Union.

He is the author of several legal articles and publications and regularly speaks at national and international events, with a particular focus on Brazilian, German and Portuguese labor law. He is co-author of Notes Sobre o Contrato de Trabalho na Alemanha (Thomson Reuters).

He conducts research at the Faculdade de Direito da Universidade de Lisboa and Universität Trier and is a member of the Labor Law Research Group of the Pontifícia Universidade Católica de São Paulo. He currently serves as Executive Secretary of the Portuguese Labor Law Association and participates in prominent national and international networks dedicated to the study of labor relations.