Wellington Araújo | Senior Software Engineer

About me

I am Wellington Araújo Silva, a Senior Software Engineer based in Porto, Portugal, with over 8 years of international experience architecting and delivering mission-critical enterprise systems. I hold a Bachelor’s degree in Computer Science from the Federal University of Campina Grande (UFCG) and possess advanced English proficiency, strengthened by an academic exchange program in the United States.

Throughout my career, I have driven complex software initiatives across the banking and investment sectors (Natixis / Groupe BPCE, Matera / Central Bank of Brazil compliance), telecommunications (Telefônica/VIVO OSS via Accenture), and pharmaceutical retail (Raia Drogasil via Develcode). My core expertise centers on Java, Spring Boot, event-driven architectures with Apache Kafka and RabbitMQ, Kubernetes orchestration, and clean architecture.

Certified in Scrum Fundamentals (SFC) and DevOps Essentials (DEPCP), I combine deep architectural thinking with test automation and modern AI developer tooling (Gemini CLI, Copilot) to accelerate delivery without sacrificing high engineering standards.

View Resume

Professional Experience

Over 8 years of software engineering expertise delivering high-availability systems, mission-critical financial integrations, and distributed microservices across Europe and Latin America.

Full-Stack Engineer contributing to the Insurance team at Natixis, a premier French corporate & investment bank (part of Groupe BPCE).
Architected and enhanced systems facilitating the creation and validation of customer investment contracts, delivering new features and resolving technical and regulatory bugs.
Maintained backend and frontend components utilizing Java, Spring Boot, JSF, PrimeFaces, and JBoss, ensuring rigorous business operations and regulatory compliance.
Successfully led and executed the complete frontend migration of a legacy JSF application from RichFaces to modern PrimeFaces while preserving core business functionality.
Leveraged cutting-edge AI developer tooling (Gemini CLI, GitHub Copilot) to accelerate refactoring, code quality analysis, and testing standards.

Java Spring Boot JSF / PrimeFaces JBoss REST APIs Investment Banking Gemini CLI & Copilot

Implemented robust validation rules within Matera's proprietary Accounting Management System, auditing financial reports from Brazilian financial institutions prior to submission to the Central Bank of Brazil (BACEN).
Developed complex frontend workflows using GSX (Matera's proprietary JSF-based UI technology) to streamline financial reconciliation and accounting validation processes.
Guaranteed high data integrity, transactional precision, and full auditability for high-volume banking data.

Java Accounting Systems Financial Compliance GSX / JSF Regulatory Reporting

Spearheaded critical backend microservices for Raia Drogasil, Brazil’s leading pharmaceutical retail corporation, dedicated to medication pricing and dynamic discount management.
Engineered high-performance integrations between retail POS systems and third-party pricing service providers utilizing Java, Spring Boot, RabbitMQ, MongoDB, and Docker.
Refactored and tuned medication price calculation engines, achieving substantial improvements in computational throughput, scalability, and response latency.

Java Spring Boot RabbitMQ MongoDB Docker Microservices Pricing Engines

Built and maintained large-scale telecommunications equipment provisioning and OSS systems for Telefônica/VIVO, serving millions of telecom subscribers nationwide.
Developed mission-critical microservices and distributed event streams using Java, Spring Boot, Apache Kafka, Kubernetes, MongoDB, Oracle WebLogic, Oracle SQL, and PL/SQL.
Engineered responsive Angular web applications for broadband service provisioning and availability verification, seamlessly consuming backend RESTful services.
Authored automated test suites (JUnit / Mockito) and conducted extensive refactoring, elevating code coverage, fault tolerance, and system stability.
Actively mentored junior engineers, conducted peer code reviews, and fostered agile delivery within cross-functional teams.

Java Spring Boot Apache Kafka Kubernetes Angular Oracle SQL / PL-SQL Oracle WebLogic REST & SOAP

Skills & Tech Stack

Specialized in architecting high-throughput distributed systems, microservices, and enterprise applications using modern Java technologies and cloud ecosystems.

High-performance enterprise services, RESTful APIs, and clean modular domain models built for scalability.

Java 8 / 11 / 17 / 21 Spring Boot Spring Cloud Hexagonal Architecture Microservices Clean Code Design Patterns

Decoupled asynchronous processing, event streaming, and resilient message queue broker integrations.

Apache Kafka RabbitMQ Event-Driven Architecture Distributed Caching Fault Tolerance Asynchronous Messaging

Automated continuous delivery pipelines, containerization, and production container orchestration.

Kubernetes (K8s) Docker CI / CD Pipelines Git / GitHub Actions Linux & Bash Agile / Scrum

Relational schema design, robust transaction management, complex queries, and ORM mapping.

PostgreSQL Oracle DB Spring Data JPA Hibernate SQL Optimization Database Migrations

Automated unit/integration testing ensuring code reliability, alongside modern single-page applications.

JUnit 5 Mockito Integration Testing Angular TypeScript / JavaScript HTML5 & SASS

B.S. in Computer Science

Federal University of Campina Grande (UFCG)

Scrum Fundamentals Certified

SCRUMstudy (SFC™)

DevOps Essentials

CertiProf Certified

Technical Articles & Insights

Sharing deep architectural reflections, system design trade-offs, and practical lessons from engineering high-throughput distributed systems.

Architecture 7 min read

Microservices Are Not Always the Answer: When a Modular Monolith Makes More Sense

A pragmatic analysis of architecture trade-offs. Why microservices introduce operational complexity, and when a well-structured modular monolith is a superior, more resilient design choice.

#Architecture #Microservices #ModularMonolith #SystemDesign

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Design Strategy 6 min read

Hexagonal Architecture: The Genesis of a Disruptive Idea

Tackling excessive coupling between business logic and external infrastructure. How Ports & Adapters provide true modularity, testability, and technology independence in microservices.

#HexagonalArchitecture #CleanCode #Modularity #DDD

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Best Practices 8 min read

Design Patterns & Anti-Patterns: A Structured Approach

A structured examination of GoF design patterns paired with the crucial discipline of identifying and eliminating architectural anti-patterns in complex enterprise software.

#DesignPatterns #AntiPatterns #CleanCode #Refactoring

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Concurrency 7 min read

Multithreading: Concepts, Benefits, and Implementation

Mastering thread lifecycle, synchronization, parallel execution, and thread pools. Practical techniques for engineering high-concurrency, race-condition-free Java systems.

#Multithreading #Concurrency #Parallelism #Java

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Frameworks 7 min read

Inside the Spring Framework: Foundation of Modern Java

From J2EE alternatives to the modern enterprise backbone. How Inversion of Control, Spring Boot, and Spring Security power resilient, production-ready distributed architectures.

#SpringBoot #SpringFramework #Java #Backend

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Ecosystem 6 min read

The Journey of JAVA’s Evolution: From Inception to Modern Era

From "Write Once, Run Anywhere" to Virtual Threads, Z Garbage Collector, and Pattern Matching. Exploring the key milestones that keep Java dominant in modern enterprise engineering.

#Java21 #VirtualThreads #JVM #Ecosystem

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Hi, my name is Wellington Araújo
Senior Software Engineer.

About me

Professional Experience

Senior Software Engineer

Software Engineer

Senior Software Engineer

Mid-Level Software Engineer

Skills & Tech Stack

Backend & Microservices

Distributed Systems

Cloud & DevOps

Data & Persistence