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Pedro Leonardo

@pedroleonardo

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Java Backend Engineer | Scaling Event-Driven Core Banking Architectures & Reactive Microservices

Brazil

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I am a backend developer specializing in Java 17+ and Spring Boot 3, with a focus on microservices architectures, high-performance integrations, and scalable solutions for the financial sector. Having previously worked at NTT DATA, I currently operate within an ecosystem of distributed services—utilizing Kafka, Spring Cloud, AWS (S3, ECR), Docker/Compose, PostgreSQL, and MongoDB—to build robust, resilient, and event-driven applications.

I enjoy solving complex problems, designing lean systems, and creating automated pipelines that genuinely enhance the development workflow. My practical experience includes file integration (CNAB/ACMP), asynchronous communication, testing with Testcontainers, observability strategies, and architectural best practices (such as DDD, clean architecture, and hexagonal architecture).

Alongside my professional work, I develop personal projects like "BuddyBridge," a modern web platform for animal shelter management, I'm constantly exploring new technologies and refining my approach to software design.

Experience

Work history, roles, and key accomplishments

Current

Software Engineer

Current

Artta

May 2025 - Present (1 year 5 months)

Executed migration of legacy core banking infrastructure to distributed microservices using Java and Spring Boot, architecting high-availability payment engines. Engineered event-driven architecture and anti-fraud engines, and built stateless transport services for secure file synchronization.

Java Spring Boot Kafka MongoDB OpenTelemetry Prometheus Grafana S3 Microservices Distributed Systems Event Driven Architecture Anti Fraud Telemetry Distributed Tracing

Current

Full Stack Developer

Current

LogicHub

Oct 2021 - Present (5 years)

Designed, implemented, and maintained scalable microservice architectures, RESTful APIs, and reactive data processing pipelines. Built event-driven streaming solutions and automated deployment pipelines with Docker, Kubernetes, and CI/CD tools.

Microservices REST APIs Reactive Programming Event Driven Architecture PostgreSQL MySQL MongoDB Redis Docker Kubernetes CI CD AWS SOLID Principles Clean Code Security Best Practices

Java Developer

NTT DATA Business Solutions

Mar 2023 - Apr 2025 (2 years 1 month)

Optimized SAP Commerce (Hybris) modules and RESTful APIs in Java, decreasing production incidents by 20% and speeding up delivery of new enterprise client features. Refactored Java backend facade patterns and impex modeling across 5 corporate client platforms, reducing recurring functional errors and protecting platform performance and availability.

Java SAP Commerce Hybris REST APIs Spring Framework ImpEx Backend Development Performance Optimization

Web Development Intern

Celepar

Jun 2022 - Feb 2023 (8 months)

Maintained legacy web applications built on PostgreSQL and PHP for the Paraná State Department of Culture, reducing critical functional failures by 20%. Optimized relational queries and table structures in PostgreSQL across 3 legacy modules, reducing search response times by 80%.

PostgreSQL PHP Web Development Legacy Systems Query Optimization Database Optimization