Graduated in Law in 1993 at Law School of Bauru Universitary Center, in São Paulo, Mendonça concluded his specialization in Public Law at University of Brasília, Master's degree at University of Salamanca, with a thesis about corruption and the Rechtsstaat and received the highest grade by his Doctor's degree thesis "Estado de Derecho y Gobernanza Global" ("Rechtsstaat and Global Governance") at the same University.