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Felipe Emerson de Oliveira Calixto

@felipeemersondeolive

Backend Java Engineer designing high-performance event-driven microservices with strong observability and reliability practices.

Brazil

Message

What I'm looking for

I’m looking for a team building modern microservices and reactive backends, where I can own performance improvements, reliability, and observability—collaborating across functions, shipping with CI/CD, and mentoring others.

I’m a Backend Java Engineer with an MSc in Computer Science and a strong foundation in software engineering. I design, optimize, and maintain high-performance, event-driven microservices while focusing on reliability and code quality.

At ShuffleUp (remote), I take ownership of core backend components for iGaming applications—leading feature design, technical discussions, and ongoing maintenance. I improved API response times by up to 90% using Redis caching, parallelization, PostgreSQL query optimization, and batch processing.

I build and scale robust event-driven microservices with Java 21, Spring Boot 3, and Apache Kafka, including reactive, non-blocking services using Spring WebFlux and Project Reactor. I also strengthen delivery and stability through comprehensive unit and integration testing, plus code review and mentoring.

I manage cloud deployments and CI/CD pipelines with Docker, Kubernetes, GCP, ArgoCD, and GitLab CI/CD, and I resolve live incidents during on-call rotations using the Grafana Suite for deep observability. Earlier roles strengthened my backend development with Spring and service integration, and helped me evolve an observability platform and improve its CI/CD and test coverage.

Experience

Work history, roles, and key accomplishments

Current

Backend Java Engineer

Current

Shuffleup

Nov 2024 - Present (1 year 7 months)

Owned core backend components for iGaming applications, leading feature design, technical discussions, and ongoing maintenance. Improved API response times by up to 90% using Redis caching, parallelization, PostgreSQL query optimization, and batch processing, while building and scaling event-driven microservices with Java 21, Spring Boot 3, and Apache Kafka.

Java 21+Spring Boot Project Reactor Apache Kafka Redis PostgreSQL Docker Kubernetes

Software Engineer

Splab/Ufcg

Jun 2023 - Jan 2024 (7 months)

Built a robust Java/Spring backend with complex business logic and maintained clean, well-documented code using Javadoc. Developed a responsive React frontend from Figma wireframes, integrated external services for monitoring, modeled MongoDB non-relational data, and implemented automated testing to improve platform stability.

Java Spring Boot React MongoDB Automated Testing Junit Agile Scrum

Software Engineer

Lsd/Ufcg

Oct 2022 - Mar 2023 (5 months)

Contributed to the evolution and scaling of a microservices-based observability platform. Enhanced core services using Java and Spring Boot, improved GitLab CI/CD pipelines, increased test coverage with automated JUnit tests, and supported Agile/Scrum delivery.