Isaac Mateus

- I redesigned a legacy application in the financial sector, playing a key role in defining the system architecture. I implemented the SAGA pattern using Apache Kafka to orchestrate communication between multiple microservices developed with Java and Spring Boot. The solution was built to be dynamic and reusable across various banking credit origination scenarios. Additionally, I ensured over 90% test coverage through comprehensive unit and integration tests using RestAssured, WireMock, Spring Kafka Test, and JUnit. - I developed a rule engine to handle a wide range of business rules that vary according to the type of credit being processed. The solution significantly reduced execution time by leveraging Java Virtual Threads for improved concurrency and performance. - I developed a data persistence system where ensuring ACID compliance was critical to guarantee the reliability and consistency of stored data. The solution was implemented using OracleDb and MongoDb along with additional persistence strategies to support transactional integrity. - I supported new team members during the onboarding process by guiding them through the system architecture and assisting with technical topics related to Java, Spring, MongoDB, Kafka, and other technologies.

- I developed multiple applications using Java and Spring Boot for a mining sector product that orchestrated inspections and maintenance operations within mining sites. The system also provided reports and performance metrics for management oversight. Additionally, I developed mobile applications using Flutter to support field workers in coordinating and tracking their tasks on-site, which led to a 60% reduction in workforce management overhead. - Azure Solutions were used throughout the entire system development lifecycle to ensure the availability, scalability, and redundancy of all services. The architecture also included a caching strategy using Redis and asynchronous communication between services through Kafka. - I played an important role in mentoring and upskilling team members by using pair programming practices, delivering technical talks and training sessions focused on software development, as well as providing deep insights into the business rules and domain of the product.

- I developed several backend applications using Java and Spring Boot, as well as frontend solutions using Angular, JavaScript, and React, to manage the lifecycle of mining companies—including maintenance, inspections, and other operational processes. These systems also provided reports and performance metrics to support management decision-making. All software was designed with testability in mind, ensuring high-quality standards through the use of JUnit for automated testing. - I developed a real-time monitoring and tracking system for personnel inside mining sites to support the orchestration of maintenance operations in a mineral processing plant. The backend was built using Java and Spring Boot, the frontend with HTML and JavaScript, and the mobile application with React Native. This solution contributed to a significant reduction in the number of accidents occurring within the mines.

- I assisted in the development of a transaction core for a telecommunications company, utilizing Java and OSGi to build a flexible and modular system that supported complex transaction workflows and seamless service integrations. The architecture was designed to handle high transaction volumes, ensuring scalability and performance. Additionally, the use of OSGi allowed for modularity and easy service updates, reducing system downtime and improving maintainability. This solution played a key role in optimizing the company’s transaction processing capabilities and enhancing operational efficiency. - All developed features were thoroughly tested using JUnit to ensure the reliability and quality of the system, supporting the continuous integration and delivery process.

- I developed a system responsible for processing loans for public servants, utilizing Java, Spring Boot, HTML, and JavaScript. The system was designed to ensure secure and efficient loan management, providing features such as application processing, credit evaluation, and loan approval workflows. It incorporated robust security measures to protect sensitive personal and financial data. This solution streamlined the loan issuance process, improving operational efficiency and reducing processing times.

Developing software for government agencies in Minas Gerais, using Java programming language for web development with JPA and Hibernate frameworks.

- Managing hospital management systems and databases, maintaining and managing computer networks, performing computer maintenance, and resolving general IT-related issues.

I assisted individuals in the IT field, performed maintenance on notebooks and computers, developed training materials for teachers, and resolved various network-related issues.

Nossas aulas são voltadas para programação, desenvolvimento Web, também tem bastante foco em banco de dados relacional, dentre outros.