Sònia Antequera graduated in Law in 1997 from Universtiat Pompeu Fabra. She prepared for the Judicial Service Commission public examinations for six years. Subsequently, she completed a Master’s Degree in Public Law at Instituto de Educación Continua of Universtiat Pompeu Fabra in 2003–2004 where she also completed postgraduate studies in Advanced Public Law, Territorial and Urban Planning Law, and Environmental Law, specializing in administrative, urban planning, and real estate law.
Her professional experience began in the Departament d’Urbanisme of the Ciutat Vella District of Barcelona City Council, during 2003 and 2004. From 2004 until joining Clavell Canals, she was part of the law firm MILÀ ADVOCATS, S.L.P., specializing in administrative and Urban planning law.