Gabriel da Silva

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I worked as a Backend Engineer developing and evolving critical systems within the repossession and financial operations domain, operating in a microservices architecture with strong adoption of Event-Driven Architecture. My work involved domain modeling, API development, and integrations with external systems, always focusing on scalability, reliability, and direct business impact. Key responsibilities and impact • Development and evolution of microservices using Kotlin, Java, and Spring Boot applying Domain-Driven Design (DDD), Hexagonal Architecture, and SOLID principles. • Implementation of event-driven workflows to orchestrate critical repossession domain processes. • Design and evolution of REST APIs used by multiple internal systems and external integrations. • Development of asynchronous workflows using messaging systems (Kafka and AWS SQS) to increase scalability and service decoupling. • Integration with external platforms, including Zoho Expense, automating financial and operational processes. • Modeling and evolution of PostgreSQL databases, including query optimization and schema versioning using Flyway. • Implementation of cross-system notification solutions that generated direct financial impact, increasing the company's leverage in debt negotiations and asset recovery processes. • Participation in structural refactors and architectural improvements to increase system maintainability and reliability. Technologies and tools Kotlin, Java, Spring Boot, Microservices, Event-Driven Architecture, Kafka, AWS SQS, PostgreSQL, Flyway, REST APIs, Domain-Driven Design (DDD), Hexagonal Architecture, AWS, Zoho Expense APIs, Clean Code, SOLID.

- Develop and maintain scalable and resilient backend systems; - Implement solutions based on microservices architectures, with low coupling and high availability; - Perform system maintenance with daily request processing (>1M), optimizing queries and ensuring operational efficiency; - Integrate messaging and asynchronous communication solutions using Kafka, SQS/SNS for decoupling and asynchronous processing of event messages; - Design and implement caching strategies, reducing the volume of calls to external services, with reduced operational costs; - Manage relational databases (PostgreSQL, MySQL) with high availability, consistency and data integrity and No SQL for Systems with >1M requests; - Conduct test-driven development, unit, integrated and E2E tests, to ensure software security and reliability; - Monitor system performance with Grafana and Datadog, with resilience and adequate response time; - Collaborate with data teams to develop strategic dashboards, supporting metrics-driven decisions and adopting Domain-Driven Design practices.

- Develop internal systems in Kotlin with Spring Boot, event-driven to optimize business processes and incident support; - Create a system to consult active customer debts, used to respond to incidents and operational problems; - Implement an automated system for generating Mattress Breakdown and Payment files, with data processing, generation of CSV files and storage in Bucket S3. - Work on a project to generate 2nd copy of invoices, integrated with the Serasa Limpa Nome project, including debt renegotiation features. - Prepare and standardize technical documentation for the development of API Proxy with Google Apigee; - Collaborate in the standardization of tests of components of the collection team, with support in the creation of technical documentation.

- Develop APIs in Java with Spring Boot, with database modeling, gathering functional requirements and defining business rules; - Integrate AWS SDK to upload images to S3 Bucket and create backend application deployment on AWS, using Docker and EC2. - Lead the development of an inventory control system for the retail sector, creating endpoints for product management, calculating monthly/annual revenue and storage in PostgreSQL RDS.

Postgraduate specialization program focused on developing advanced skills for the new developer profile in the AI ​​age. Technical and practical preparation to architect, design, and develop large-scale applications with AI integration in workflows and autonomous agents, adopting modern methodologies, DevOps/SRE with AI, and real-world software engineering practices.

Java Applied Engineering is a postgraduate program from UNIPDS, offered 100% online with both live and recorded classes. It is designed for professionals already working in software development who want to deepen their expertise in the most relevant technologies on the market. The program focuses on advanced and hands-on learning of the Java language, with direct application in modern architectures, cloud computing, and software engineering. The curriculum covers topics such as modern Java, multithreading, Quarkus, Spring, microservices, testing, CI/CD, Docker, and Kubernetes (AWS), as well as themes related to leadership, entrepreneurship, and technological innovation. With a practical, project-oriented approach, the program is led by top-level professionals such as Hugo Santos (PDS) and Elder Moraes (Java Champion), and features four Java Champions among the faculty.

I have a background as a full-stack programmer and systems analyst. I work as a full-stack programmer, systems analyst, business process analyst, and in automation.