Senior Backend Software Engineer

Architected, documented, and delivered scalable backend solutions using Java, Python, Spring Boot, MyBatis, RabbitMQ, Redis, PostgreSQL, and Apache Airflow. Produced high-level and low-level design documentation to guide implementation and integration.

Developed REST APIs, Server-Sent Events, and WebSockets for real-time processing. Led Python and Airflow initiatives, mentored developers, optimised data pipelines from 24 hours to 30 minutes, and reduced CPU, GPU, and memory consumption by 95%. Built CI/CD pipelines with GitLab, Jenkins, SonarQube, and Docker, and modernised PDF reporting modules using Java and JasperReports.

Contributed to the merchant platform by developing merchant onboarding, commission, and payment processes. Designed and developed RESTful APIs for legacy and new frontend applications using Python, FastAPI, PostgreSQL, Redis, Celery, SQLAlchemy, Alembic, PyTest, OpenAPI, and JWT.

Designed architecture for cloud-service integration between Google Cloud Platform and AWS. Worked with Pub/Sub, BigQuery, and Amazon S3 to support platform modernisation.

Developed and maintained backend solutions for a major Latin American payments and banking platform, while also contributing to frontend applications. Worked with Java, SQL, JavaScript, AngularJS, Node.js, JPA, AWS, MySQL, Oracle, MongoDB, jPOS ISO 8583, Spring, and enterprise application servers.

Implemented the company's first CI/CD pipeline using GitLab CI/CD, Jenkins, Docker, and AWS. Automated compilation, code coverage, unit and integration tests, database versioning, and deployment to improve delivery speed and reliability.

Contributed to refactoring a large monolithic system used to update and configure millions of remote mobile devices for financial institutions across South America.

Led restructuring of critical components into independently scalable microservices, reducing response-processing times by 90%. Developed backend and frontend modules using Java, JavaScript, AngularJS, Node.js, JPA, SQL, JUnit, PMD, and FindBugs.

Developed and maintained high-availability payment Gateway and Authorizer systems processing millions of secure payment transactions. Used Java, Python, MySQL, MongoDB, Redis, WebSockets, RabbitMQ, ISO 8583, and REST APIs to integrate with acquirers and third-party payment providers.

Initiated and developed iso-sender, a Java application based on jPOS that simulated payment requests for Gateway and Authorizer systems. The tool reduced development and testing effort and lowered third-party API integration costs.

Developed Java web applications for remote and automated configuration of POS and mobile devices, enabling devices to be configured without manual intervention.

Worked with HTML, JavaScript, CSS, JBoss Seam, Struts, JSP, JSF, RichFaces, PrimeFaces, JasperReports, Spring, JUnit, Hibernate, MySQL, Tomcat, and JBoss AS.

Developed and maintained optimised POS applications using WML Script under strict hardware constraints, including devices with as little as 8 KB of free memory. Implemented ISO 8583 and EMV standards for financial transactions.

Initiated and developed iso-responder, a Java application using jPOS to simulate payment responses from Gateway and Authorizer systems. The solution reduced development, testing, and third-party API integration effort.

Replaced legacy PeopleSoft desktop applications with Java web applications using JSF, PrimeFaces, Tomcat, and Oracle Database.

The modernisation improved user experience and customer satisfaction and contributed to acquiring two additional contracts.

Conducted free computer and internet classes for older adults and low-income students. Taught Microsoft BASIC, computer cabling, and network configuration to young students.

Helped 20 students secure their first jobs through practical technology education and career support.

Completed a Master's Degree in Software Engineering with Java.

Completed an Associate's Degree in Systems Analysis and Development.