I am a Senior Software Engineer with vast experience (35+ years) in software development in several environments, platforms, and technologies, but currently, I am focused on Java technology (20+ years), working mainly as a Software Engineer and sometimes as a Lead Software Engineer. Besides (and with) Java, my software engineering experience extends to Java EE solutions, Spring Boot, JPA, Hibernate, JAX-RS (Restful API), and Android applications. About databases, I have strong skills in SQL, specially Oracle PL/SQL and PostgreSQL. To improve my backend expertise, I have been working with AWS cloud resources (6y+), such as EC2, RDS, S3, Auto Scaling, Load Balancing, and other resources. Although I am solid as a Backend engineer, I have good expertise in Fullstack engineering using additionally jQuery, JavaScript, and React.JS, as well as JSP, JSF, and JSTL.In my current job, I rebuilt the billing system, helping to reduce the human effort required to issue accurate billing significantly. Previously, it took days or weeks to collect information from multiple systems and spreadsheets, in a long and laborious process, to feed the billing system. Today, the new billing system automatically consolidates all the necessary information from its source system, regardless of the system it is in, using microservices, culminating in the automatic issuance of the invoice by the ERP. Thus, the work of checking and collecting information, calculating the billing, and issuing the invoice, was reduced to 4 hours. The average effort was 7 days, with cases recorded of more than 30 days. This reflects a reduction of approximately 90% in the effort of professionals involved in billing to calculate and issue accurate billing and invoices.My long experience also includes Python, Ruby, PHP, ASP, Delphi, VB, Cobol, MySQL, MS-SQL Server, DB2, and others. I have worked in many areas such as petrochemical industries, banks, financial institutions, hospitals, healthcare, government agencies, car dealerships, entertainment services, facilities services, etc. In addition, I have extensive experience providing integration solutions between different systems, and I also sometimes work as a Data Engineer.Finally, I am a professional who stands out for my commitment to the organization, always determined to do my best to perform my job. I am very proactive in finding and solving problems, and I enjoy helping my coworkers with this or developing their skills and knowledge. I love new challenges, and I am always willing to learn new technologies.