As a software engineer, many of the projects I have been, I have had the chance to design in full the database model and I have also being part of the teams to design big models like the ones created for two banks, Banco Sofitasa, Banco Confederado, where we use different tools, for the model specifically Oracle tools, also, SQLDBM, Visio, Sybase, DBSchema, using Oracle as a Database manager for both software. I have also used other tools like Microsoft SQL Server, MySQL and PostgreSql