08/18/2026 updated


100 % available
Software Engineer, Data Engineer, Backend Develope
Brazil
Worldwide
Informatic Engineer, Master in Project ManagementJava (Programming Language).NET FrameworkApache ActiveMQAmazon Web ServicesApache HTTP ServerArchitectureTeachingAutomationTest AutomationUnit TestingTelecommunicationsC Sharp (Programming Language)Cloud ComputingContinuous IntegrationExtract Transform Load (ETL)
Hi, I hope you are well. I have experience over 15 years as a Backend Developer, and Data Engineer with Power BI ETL in several kinds of companies like oil company, health, bank, financial, telecom consulting, among others companies.
I feel comfortable working remotely as a Backend Developer (Java Python C#) also Business Analyst, Data Engineer as well as Analyst in BI ETL tools like (with Power BI, Pentaho or MicroStrategy).
As a Backend Developer Senior and Data Engineer I’ve used these technologies, Java Python C#, Spring Boot, Log4J, DJAngo, .Net, MVVM, Microservice, REST SOAP MQ, Hibernate , service buss workflow Apache Camel, Karaf, Activemq, MongoDB, Oracle PL/SQL, MsSql Server Test Junit, Selenium, GIT, e NoSQL, Docker, Cloud AWS RDS, Power BI MDX DAX, Linux, NumPy, Matplotlib, Pandas, Theano, SciPy.
I'm a team player, I really like learning and teaching.
I recently used this technologies Java Spring Boot Hibernate Apache libraries, and common open-source frameworks Oracle PL/SQL Microservice Rest Docker Log4J Junit Testing tools AWS and others, in an international English project for archiving the German government’s requirements of my client in record time the client's German government requirements middle pandemic. Last project worked on an international project to get done in record time the client's German government requirements middle pandemic.
I recently used this technologies Java Spring Boot JPA Hibernate Apache libraries, and common open-source frameworks Oracle PL/SQL microservice, hexagonal architecture, Rest, Testing tools AWS and others, in an international English project for archive the German government’s requirements. This project presented features of hexagonal architecture, in which I developed new functionalities from the stored procedure, microservices in spring boot side to side React in TypeScript, to JUnit Cypress, JUnit, Mockito, Selenium, Unit Test, Automation Test, BAW, Business Automation , and finally deploy in ci/cd in Jenkins.Hi, I hope you are well. I have experience over 10 years as a Backend Developer, and Data Engineer with Power BI ETL in several kinds of companies like oil company, health, bank, financial, telecom consulting, among others companies.
I feel comfortable working remotely as a Backend Developer (Java Python C#) also Business Analyst, Data Engineer as well as Analyst in BI ETL tools like (with Power BI, Pentaho or MicroStrategy).
As a Backend Developer Senior and Data Engineer I’ve used these technologies, Java Python C#, Spring Boot, Log4J, DJAngo, .Net, MVVM, Microservice, REST SOAP MQ, Hibernate , service buss workflow Apache Camel, Karaf, Activemq, MongoDB, Oracle PL/SQL, MsSql Server Test Junit, Selenium, GIT, e NoSQL, Docker, Cloud AWS RDS, Power BI MDX DAX, Linux, NumPy, Matplotlib, Pandas, Theano, SciPy.
I'm a team player, I really like learning and teaching.
I recently used this technologies Java Spring Boot Hibernate Apache libraries, and common open-source frameworks Oracle PL/SQL Microservice Rest Docker Log4J Junit Testing tools AWS and others, in an international English project for archiving the German government’s requirements of my client in record time the client's German government requirements middle pandemic. Last project worked on an international project to get done in record time the client's German government requirements middle pandemic.
I recently used this technologies Java Spring Boot JPA Hibernate Apache libraries, and common open-source frameworks Oracle PL/SQL microservice, hexagonal architecture, Rest, Testing tools AWS and others, in an international English project for archive the German government’s requirements. This project presented features of hexagonal architecture, in which I developed new functionalities from the stored procedure, microservices in spring boot side to side React in TypeScript, to JUnit Cypress, JUnit, Mockito, Selenium, Unit Test, Automation Test, BAW, Business Automation , and finally deploy in ci/cd in Jenkins.
linkedin. com/in/ooleondev
github. com/ooleon
I feel comfortable working remotely as a Backend Developer (Java Python C#) also Business Analyst, Data Engineer as well as Analyst in BI ETL tools like (with Power BI, Pentaho or MicroStrategy).
As a Backend Developer Senior and Data Engineer I’ve used these technologies, Java Python C#, Spring Boot, Log4J, DJAngo, .Net, MVVM, Microservice, REST SOAP MQ, Hibernate , service buss workflow Apache Camel, Karaf, Activemq, MongoDB, Oracle PL/SQL, MsSql Server Test Junit, Selenium, GIT, e NoSQL, Docker, Cloud AWS RDS, Power BI MDX DAX, Linux, NumPy, Matplotlib, Pandas, Theano, SciPy.
I'm a team player, I really like learning and teaching.
I recently used this technologies Java Spring Boot Hibernate Apache libraries, and common open-source frameworks Oracle PL/SQL Microservice Rest Docker Log4J Junit Testing tools AWS and others, in an international English project for archiving the German government’s requirements of my client in record time the client's German government requirements middle pandemic. Last project worked on an international project to get done in record time the client's German government requirements middle pandemic.
I recently used this technologies Java Spring Boot JPA Hibernate Apache libraries, and common open-source frameworks Oracle PL/SQL microservice, hexagonal architecture, Rest, Testing tools AWS and others, in an international English project for archive the German government’s requirements. This project presented features of hexagonal architecture, in which I developed new functionalities from the stored procedure, microservices in spring boot side to side React in TypeScript, to JUnit Cypress, JUnit, Mockito, Selenium, Unit Test, Automation Test, BAW, Business Automation , and finally deploy in ci/cd in Jenkins.Hi, I hope you are well. I have experience over 10 years as a Backend Developer, and Data Engineer with Power BI ETL in several kinds of companies like oil company, health, bank, financial, telecom consulting, among others companies.
I feel comfortable working remotely as a Backend Developer (Java Python C#) also Business Analyst, Data Engineer as well as Analyst in BI ETL tools like (with Power BI, Pentaho or MicroStrategy).
As a Backend Developer Senior and Data Engineer I’ve used these technologies, Java Python C#, Spring Boot, Log4J, DJAngo, .Net, MVVM, Microservice, REST SOAP MQ, Hibernate , service buss workflow Apache Camel, Karaf, Activemq, MongoDB, Oracle PL/SQL, MsSql Server Test Junit, Selenium, GIT, e NoSQL, Docker, Cloud AWS RDS, Power BI MDX DAX, Linux, NumPy, Matplotlib, Pandas, Theano, SciPy.
I'm a team player, I really like learning and teaching.
I recently used this technologies Java Spring Boot Hibernate Apache libraries, and common open-source frameworks Oracle PL/SQL Microservice Rest Docker Log4J Junit Testing tools AWS and others, in an international English project for archiving the German government’s requirements of my client in record time the client's German government requirements middle pandemic. Last project worked on an international project to get done in record time the client's German government requirements middle pandemic.
I recently used this technologies Java Spring Boot JPA Hibernate Apache libraries, and common open-source frameworks Oracle PL/SQL microservice, hexagonal architecture, Rest, Testing tools AWS and others, in an international English project for archive the German government’s requirements. This project presented features of hexagonal architecture, in which I developed new functionalities from the stored procedure, microservices in spring boot side to side React in TypeScript, to JUnit Cypress, JUnit, Mockito, Selenium, Unit Test, Automation Test, BAW, Business Automation , and finally deploy in ci/cd in Jenkins.
linkedin. com/in/ooleondev
github. com/ooleon
Experience
Professional experience10+ years
Freelancer since1999
Languages
EnglishFluentPortugueseFluentSpanishNative speaker
Project history
The One Billion Row Challenge - 1brc.
https://www.linkedin.com/in/ooleondev/overlay/urn:li:fsd_profileProject:(ACoAADJetg0BWeXjxLw8rQUIim0NbQzaBE5dDoI,1863904500)/skill-associations-details/The One Billion Row Challenge - 1brc
https://www.linkedin.com/in/ooleondev/overlay/urn:li:fsd_profileProject:(ACoAADJetg0BWeXjxLw8rQUIim0NbQzaBE5dDoI,1863904500)/skill-associations-details/The One Billion Row Challenge - 1brc