From 1992 to 1999, Carlos Steiner was an intern and then a lawyer at Malheiros e Almeida Prado Advogados, working in administrative and electoral law. From 1999 to 2012, he was a partner at Motta, Fernandes Rocha Advogados, being one of those responsible for the formation of the São Paulo office. He has been a partner of Chediak Advogados since 2012, where he continues acting primarily in civil litigation, arbitration, and real estate operations.