Freelancer profile translated to English.

Description

I am a Senior Java Software Engineer with over 6 years of experience working in backend, REST APIs, microservices, and system integrations.

I have primarily worked on financial, insurance, payments, and digital credit projects, both in modern systems and legacy applications. My main stack is Java, Spring Boot, Java EE, Angular, AWS, Kafka, Docker, Kubernetes, and SQL/NoSQL databases.

I enjoy participating in projects where I can help solve real problems: improving existing systems, modernizing applications, building APIs, reviewing integrations, investigating production errors, and delivering stable and maintainable solutions.

I also have experience with legacy systems using JSP, JSF, EJB, Struts, and AngularJS, in addition to modern Angular. I can contribute to both backend development and full-stack evolution of corporate applications.

Languages

Portuguese
Native or bilingual
English
Conversational
Spanish
Fluent

Workplace preferences

Can work on-site

Madrid (up to 50km), Bilbao (up to 50km), Ourense (up to 10km)

Fiserv
Senior Java Software Engineer
November 2025 - Today (9 months)
Develop and maintain Java/Spring Boot microservices for a LATAM financial platform, covering PIX integrations, statements, and inter-company reconciliation, with a focus on transactional consistency and traceability. ENGINEERING: Evolve a reconciliation portal for international companies with hexagonal architecture, Resilience4j, and integration patterns, reinforcing fault isolation, maintainability, and production support. DELIVERY: Integrate financial systems, internal APIs, and external services with Java and Node.js, supporting critical reconciliation processes, AWS messaging, and observability.
TECHNOLOGY: Java 8/21, Spring Boot, Node.js, REST APIs, Resilience4j, AWS SQS/SNS, Oracle, Redis, Rancher, Grafana, and Fortify.
Spring Boot Oracle Database Quarkus AWS Grafana
MJV Technology & Innovation
Java Backend Developer
February 2023 - November 2025 (2 years and 9 months)
Performed end-to-end backend deliveries for insurance, product enhancements, and payment orchestration, from analysis to production, supporting deployments. ENGINEERING: Developed microservices and REST APIs with Java/Spring Boot and Node.js/NestJS, integrated with internal systems, financial partners, and payment methods, preserving contracts and operational stability. DELIVERY: Applied Resilience4j to contain cascading failures and orchestrated event-driven integrations with Kafka, Saga, and hexagonal architecture, reducing service coupling.
TECHNOLOGY: Java 8/17, Spring Boot, Node.js, NestJS, Kafka, Resilience4j, AWS, Docker, Kubernetes, OpenShift, Redis, Oracle, MongoDB, Dynatrace, Datadog, Azure DevOps, Fortify, and Angular 15.
Microservices Spring Boot Angular 17 Kafka NestJs
Midway
Java Semi-Senior Developer
December 2022 - January 2023 (1 month)
SCOPE: Developed distributed Java/Spring Boot services for PIX and payment integrations, including blockchain-related flows, supporting API evolution and operational stability. ENGINEERING: Implemented Kafka/gRPC, security with Keycloak, and API exposure with Kong; participated in testing, performance, incidents, and CI/CD.
TECHNOLOGY: Java, Spring Boot, Kafka, gRPC, Keycloak, Kong, PostgreSQL, Redis, AWS, Azure DevOps, Docker, and Node.js.
Java Spring AWS Elasticsearch NestJs