Hi, I’m Valdemar Andrade, a Backend Engineer specializing in Java, Spring Boot, and distributed systems architecture. I design scalable REST APIs, event-driven microservices, and database-driven applications using PostgreSQL and MySQL. I enjoy building resilient, scalable systems and contributing to enterprise-grade distributed architectures. I'm expanding my expertise in Kubernetes and deployment automation ( Helm ) for cloud-native applications, and I thrive in collaborative environments that push for clean architecture, SOLID principles, and modern backend practices.…

Valdemar Andrade

Hi, I’m Valdemar Andrade, a Backend Engineer specializing in Java, Spring Boot, and distributed systems architecture. I design scalable REST APIs, event-driven microservices, and database-driven applications using PostgreSQL and MySQL. I enjoy building resilient, scalable systems and contributing to enterprise-grade distributed architectures. I'm expanding my expertise in Kubernetes and deployment automation ( Helm ) for cloud-native applications, and I thrive in collaborative environments that push for clean architecture, SOLID principles, and modern backend practices.…

Available to hire

Hi, I’m Valdemar Andrade, a Backend Engineer specializing in Java, Spring Boot, and distributed systems architecture. I design scalable REST APIs, event-driven microservices, and database-driven applications using PostgreSQL and MySQL. I enjoy building resilient, scalable systems and contributing to enterprise-grade distributed architectures.

I’m expanding my expertise in Kubernetes and deployment automation ( Helm ) for cloud-native applications, and I thrive in collaborative environments that push for clean architecture, SOLID principles, and modern backend practices.

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Skills

Experience Level

Java
Expert
Docker
Expert
PostgreSQL
Expert
Spring
Expert
MySQL
Expert
GitHub
Expert
API
Expert
MongoDB
Expert
Redis
Intermediate
Kubernetes
Intermediate

Language

Portuguese
Fluent
English
Advanced

Work Experience

Backend Java Developer at Freelance
January 1, 2025 - Present
Designed and implemented backend systems focused on scalable APIs and distributed architectures. Built RESTful services using Java and Spring Boot following microservices principles. Designed event-driven communication flows using Apache Kafka. Implemented authentication and role-based access control using Spring Security. Designed and optimized relational database schemas (PostgreSQL). Containerized applications using Docker. Applied CI/CD pipelines using GitHub Actions for automated builds and deployment workflows. Collaborated with frontend systems (React-based integrations). Translated business requirements into backend system designs.
Backend Java / Full Stack Developer at Freelancer
January 1, 2025 - Present
Developed backend applications using Java and Spring Boot, focused on scalable REST APIs, backend architecture, and system integration. Key responsibilities included: developing a clinic management system with Spring Boot and PostgreSQL, implementing authentication and role-based access control, designing business rules and database models ensuring data integrity, applying Clean Architecture and SOLID principles, developing REST endpoints for frontend integration, and collaborating with frontend via React; used Git and GitHub for version control and collaboration workflows.

Education

Bachelor’s Degree in Computer Engineering (Incomplete) at Catholic University of Angola
January 11, 2030 - May 12, 2026
Bachelor's Degree in Informatic Engineering at Catholic University of Angola
January 11, 2030 - June 17, 2026

Qualifications

REST APIs with Spring Boot — Udemy
January 11, 2030 - May 12, 2026
React & Spring Boot Full Stack Application — Udemy
January 11, 2030 - May 12, 2026
Secure Code in Java and Spring Boot — Udemy
January 11, 2030 - May 12, 2026
Concurrency in Java — Udemy
January 11, 2030 - May 12, 2026
Java Best Practices for Efficient, Scalable and Secure Code — Udemy
January 11, 2030 - May 12, 2026

Industry Experience

Software & Internet, Computers & Electronics, Professional Services, Manufacturing, Media & Entertainment, Education
    PetSafe QR

    A complete pet identification and management system using QR codes. Developed with Spring Boot (Java 17+) on the backend and React on the frontend, PetSafe QR allows pet owners to create complete profiles with medical and contact information, generating a unique QR code that can be used on collars. It features a special “Lost Pet” functionality with highlighted visual alerts.

    repository: https://www.twine.net/signin

    Industrial Pipeline Simulator (Industry 4.0) - Part 1

    This project simulates a real industrial production pipeline, where independent services collaborate to produce goods.

    Pipeline Flow:

    Raw Material → Processing → Component Production → Product Assembly

    Each step operates as an isolated microservice, communicating through Kafka events.

    The Raw Material Service is the entry point of the production pipeline.

    It is responsible for simulating the extraction of raw materials (e.g., iron, latex, sand) that will be used by subsequent services.

    Without this service, the entire production chain cannot be initiated.

    GitHub Repository: https://www.twine.net/signin

    Industrial Pipeline Simulator (Industry 4.0) - Part 2

    Part of a distributed Industry 4.0 Industrial Pipeline Simulator, built with an event-driven microservices architecture.

    The Processing Service is responsible for transforming raw materials into usable industrial materials.

    It acts as the second stage of the production pipeline, linking raw material extraction to component manufacturing.

    Examples:

    Iron ore → Steel
Sand → Glass
Latex → Rubber

    GitHub repository: https://www.twine.net/signin

    Industrial Pipeline Simulator (Industry 4.0) - Part 3

    Part of a distributed Industry 4.0 Industrial Pipeline Simulator, built with an event-driven microservices architecture.

    The Component Service is responsible for producing industrial parts from processed materials.

    It acts as the third stage of the pipeline, responsible for transforming usable materials into components ready for assembly.

    Examples:

    Steel → Pistons, Crankshaft, Chassis
Glass → Screen
Rubber → Tires

    GitHub repository: https://www.twine.net/signin