Jefster Farlei Fernandes Caixeta Júnior

Architected and led a high-throughput API platform processing 1M+ daily transactions, integrating AI/ML pipelines, ecommerce marketplaces, and third-party logistics systems. Built distributed infrastructure with Redis, rate limiting, CI/CD, and IaC. Engineered scalable multi-region Cosmos DB solutions, led OpenTelemetry adoption, and delivered reusable Go/Java frameworks that improved reliability, observability, and developer productivity across engineering teams.

Architected and delivered a Kafka-based notification platform for a US insurance communications hub, achieving 99.9% delivery reliability and decoupling notification workflows from core services. Optimized APIs and microservices, reducing response times by 30%. Improved database performance by 40% through indexing, query tuning, and caching. Implemented observability with Prometheus, Grafana, and Loki, and drove CI/CD, Kubernetes, and AWS modernization initiatives.

Engineered backend systems supporting 10M+ daily financial transactions, improving throughput and latency through query optimization, caching, indexing, and parallel processing. Contributed to Brazil's PIX payments implementation, ensuring compliance with Banco Central and Open Banking standards. Designed high-performance APIs and integration services, improving data retrieval by 40%, standardizing integration patterns, and strengthening platform reliability through comprehensive testing strategies.

Led security initiatives for Dell's private cloud platform, identifying and remediating vulnerabilities in compliance with OWASP Top 10 standards. Developed and maintained microservices for cloud and IoT platforms, improving scalability, resiliency, and reliability. Optimized Spring Boot services, REST APIs, Redis, and MongoDB performance, reducing data retrieval times. Implemented CI/CD automation with GitLab and Jenkins to streamline deployments and improve delivery efficiency.

Built a geolocation-based disease monitoring system for the Goiás public health department (SES), enabling real-time tracking and geographic visualization of disease spread across the state. Developed critical healthcare applications supporting tuberculosis treatment tracking and digital surgery scheduling workflows, improving operational efficiency across the public health system. Implemented backend integrations and CI/CD pipelines using GitLab, Jenkins, and Flyway across multiple healthcare platforms.

· I worked on a project from State Financial Secretary from State of Mato Grosso. This project was created to perform the calculation of state tax collection rates. These indexes will be used in the distribution of funds, in the definition of public policies, and mainly in tax inspection. · Technologies used: Java, Springboot, Spring Data, Spring Security, Angular, NgPrime, Oracle database, JBoss Webserver, Apache POI, Apache HTTP Client, and Spring REST Template, Git.

Participate mainly in the project from the extinct City Ministery from Brazil, most parts of the project were related to public infrastructure. There were 3 projects to inspect, evaluate and manage every building that belongs to the federal government. I was the head of geolocation development. Technologies used: Java, Springboot, Spring Data, Spring Security, Angular, AngularJS, NgPrime, PostgreSQL, Liquibase, Spring REST Template, Git, OpenLayers, Open Street Maps, and Postgis.

I worked on the team responsible for creating the new version of the company’s main product, an ERP. The old version was developed with Java 6 and JSP, and the company decided to create a newer version using new technologies, that allows the software to be fully web and responsive for every device. I also worked to create the new version of the task manager used by the company on the support team.