Design and creation of computer systems to meet any need and on any platform (Windows, MacOS or Linux) using modern and powerful programming languages such as Java or C #. Also implementing database systems using MySQL, PostgreSQL or Microsoft SQL Server. * Up to 14 data tables * Optimal and scalable design (normalization 1, 2 and 3) * DB creation in PostgreSQL, MySQL or Microsoft SQL Server * Security of access and audit * Implementation of backup and recovery * Implementation of up to 10 views. * implementation of restrictions (data integrity). * Implementation of an autonomous data base server. * Interactions with the DB through transactions (more security). * Use of procedure and functions in the database to save server queries. * Implementation of different DB structure according to the desired result * Local or remote system.