Jan 2025 – Jul 2025 · 6 mos · Brazil · Remote

• I was the senior developer responsible for implementing and deploying the e-commerce https://filomaisvoce.com.br/ platform using Shopify, integrating with payment and delivery in Brazil. With full coverage and support provided to CEO Gislene, the project was completed.

Aug 2024 – Dec 2024 · 4 mos · Remote

• As a Senior Software Engineer and Frontend Developer, I built a modern platform using Next.js and Tailwind CSS to deliver a high-performance legal services experience. The focus was on responsiveness, accessibility, and consistent behavior across devices.
• I implemented adaptive layouts, integrated Python APIs with LLMs for case management and real-time notifications, and applied SSR/SSG strategies to improve SEO and page load times. These efforts resulted in a 40% improvement in mobile usability and a 30% increase in speed for developing reusable components.
• Skills: Next.js, Tailwind CSS, TypeScript, SSR/SSG, Responsive Design, Python APIs, LLM Integration, SEO Optimization, Component Architecture

Jan 2022 – Feb 2024 · 2 yrs 1 mo · Remote

• As a Senior Software Engineer at Gliconline (acquired by Afya for around $22 million), I architected and scaled a high-impact web application using Ruby on Rails, focusing on broadcasting features and API integration. The backend infrastructure relied on PostgreSQL for data persistence and was deployed on AWS to ensure scalability and system reliability.
• I improved system performance by reducing load times and increasing user satisfaction. Using TDD with RSpec, I achieved 95% test coverage and implemented CI/CD pipelines to automate deployments and enhance code stability. I also collaborated with cross-functional teams to deliver features ahead of schedule and mentored junior developers to strengthen overall team performance.
• Skills: Ruby on Rails, PostgreSQL, AWS, TDD, RSpec, CI/CD, REST APIs, System Architecture, Team Mentorship, Performance Optimization, Scalable Infrastructure

Jan 2021 – Jan 2022 · 1 yr · Home-Office · Remote

• As a Senior Software Engineer at Cashway.io, I led the development of secure, high-performance financial applications using Ruby on Rails for the backend and React on the frontend, all deployed on AWS infrastructure. I focused on building scalable solutions that balanced system reliability with usability.
• I designed micro-applications for virtual banking, enhancing user accessibility and streamlining internal operations. Through TDD practices, I ensured 99.9% uptime for mission-critical services and transformed complex business requirements into user-centric, scalable systems. Additionally, I promoted team collaboration through code reviews and knowledge-sharing sessions.
• Skills: Ruby on Rails, React, PostgreSQL, TDD, RSpec, CI/CD, AWS, Microservices, System Architecture, Fintech, Cross-functional Collaboration

Jan 2019 – Dec 2020 · 1 yr 11 mos · Remote

• As a Senior Software Engineer at Yanksolutions, I developed robust web applications using Ruby on Rails and led projects through the entire software development lifecycle. I worked closely with product and business teams to translate strategic goals into technical deliverables.
• I also enhanced the company's digital infrastructure by optimizing PostgreSQL databases for high performance across various industries, including logistics and healthcare. I ensured 95% test coverage with RSpec and deployed scalable, reliable systems using Heroku, contributing to stable and maintainable operations.
• Skills: Ruby on Rails, PostgreSQL, RSpec, Heroku, Agile Development, System Design, API Integration, Test Automation, Cross-functional Collaboration

Jan 2017 – Jan 2019 · 2 yrs · HomeOffice · Remote

• As a Senior Software Engineer with Ruby on Rails and React Native Developer at ProxerTelecom (successfully acquired), I architected and maintained high-security web applications using Ruby on Rails, with a strong focus on secure API integrations tailored to telecom operations. I also led the development of the company’s React Native mobile app, delivering a seamless user experience across devices and expanding product accessibility.
• I implemented encrypted data workflows and robust payment gateways, always prioritizing a security-first approach. Through automated testing with RSpec and Capybara, along with well-structured CI/CD pipelines, I reduced deployment risks by 40%. My efforts helped solidify the company’s technical reliability and scalability, which played a key role in its acquisition.
• Skills: Ruby on Rails, React Native, RSpec, Capybara, CI/CD, Secure APIs, Encrypted Workflows, Payment Gateway Integration, Mobile Development, Performance Optimization

Jan 2012 – Jan 2017 · 5 yrs · HomeOffice · Remote

• As a Senior Software Engineer at Proteste, I architected and optimized high-availability payment systems using Ruby on Rails and PostgreSQL, achieving 99.99% uptime for mission-critical financial operations. I led the development of secure, scalable infrastructure to support the organization's high-volume transaction needs.
• I drove test automation with 95% RSpec coverage and implemented CI/CD pipelines, which reduced payment failures by 30% and accelerated deployment by 40%. Additionally, I led security enhancements that ensured PCI DSS compliance, enabling the platform to handle over R$10 million in monthly transactions. I also mentored junior developers on clean code practices, increasing overall team velocity by 25%.
• Skills: Ruby on Rails, PostgreSQL, CI/CD, RSpec, High Availability Systems, PCI DSS Compliance, Payment Gateway Integration, Infrastructure Scaling, Team Mentorship, Clean Code Practices

Jan 2011 – Jan 2014 · 3 yrs · HomeOffice · Remote

• As a Senior Software Engineer at Jera, I played a dual role in leading technical development and shaping the company’s technology strategy. I architected scalable Ruby on Rails applications and oversaw the evolution of our product roadmap to meet growing business needs.
• I designed high-performance MySQL/PostgreSQL databases processing over 50K monthly transactions with 99.9% uptime. I implemented 95% test coverage with RSpec and optimized Linux server deployments, reducing infrastructure costs by 35%. I also bridged technical and business efforts—leading client negotiations, aligning cross-functional teams, and driving product decisions.
• Skills: Ruby on Rails, PostgreSQL, MySQL, RSpec, Linux Server Management, Infrastructure Cost Optimization, System Architecture, Agile Leadership, Client Communication, Business Strategy Alignment

Jan 2008 – Dec 2010 · 2 yrs 11 mos · HomeOffice · Remote

• As a Senior Software Engineer and Tech Lead at Privalia, I spearheaded the development of high-performance e-commerce platforms using Ruby on Rails. My focus was to bridge Barcelona-based systems with the specific technical and operational needs of the Brazilian market.
• I engineered MySQL databases processing over 1 million daily transactions with 99.95% uptime and led the deployment of localized payment and logistics modules on Linux servers, which increased Brazilian conversion rates by 40%. I also achieved 95% test coverage with RSpec, ensuring international stability. Daily technical syncs with teams in Barcelona and weekly stakeholder alignment meetings ensured smooth cross-border collaboration.
• Skills: Ruby on Rails, MySQL, RSpec, Linux Server Management, Payment Integration, Logistics Systems, Distributed Teams, Cross-Border Development, Test Automation, E-commerce Architecture

Jan 2005 – Jan 2010 · 5 yrs · HomeOffice · Remote

• As a Software Engineer with Ruby on Rails and PHP, and Technical Coordinator at Agence (now a multinational: agence.global), I led full-cycle technical execution for web application projects. I also contributed directly as a Senior Developer, ensuring code quality and delivery excellence across Ruby on Rails and PHP stacks.
• I architected high-performance database systems, optimizing query response times by 35% and ensuring 99.9% data integrity. I established engineering standards with 95% RSpec/Capybara test coverage and implemented CI/CD pipelines that reduced deployment failures by 40%. Additionally, I mentored over 5 developers and facilitated agile ceremonies that improved team collaboration and reduced blockers by 50%.
• Skills: Ruby on Rails, PHP, MySQL, PostgreSQL, RSpec, Capybara, CI/CD Pipelines, Agile Leadership, Technical Mentorship, Software Architecture, Performance Optimization

Jan 2003 – Dec 2007 · 4 yrs 11 mos · Caratinga, Minas Gerais, Brazil · Remote

• As a Junior Software Engineer in PHP, I developed robust and scalable web applications using modern PHP frameworks. My work focused on delivering maintainable code and performance-oriented systems for various business domains.
• I designed and optimized MySQL and PostgreSQL databases using advanced indexing techniques, resulting in a 40% increase in query performance and 99.9% data integrity. Additionally, I led initiatives to promote secure coding practices, reducing system vulnerabilities by 60% across all deployed applications.
• Skills: PHP (Laravel, Symfony), MySQL, PostgreSQL, Secure Coding, Backend Architecture, Performance Optimization, RESTful APIs, Fullstack Development, Database Indexing