Built and maintained React/Svelte healthcare web apps with 100% test coverage using Jest/Vitest, eliminating entire categories of production bugs. Developed a Next.js application acting as a data integration layer between external financial market data services and internal systems, improving reliability and reducing service failures. Acted as Technical Leader, owning architectural decisions and coordinating frontend development across the team. Led a full refactor of a patient/practitioner scheduling system using React, Redux, Tailwind and GraphQL, building reusable components and improving maintainability and performance.

Redesigned and simplified a multi-step user onboarding flow using React, Redux and Tailwind for a B2C SaaS product, directly increasing registration conversion rate by 13%. Integrated GraphQL APIs on the frontend using Apollo Client to handle efficient data fetching and avoid over-fetching.

Built a full-stack internal HR application end to end, developing the React/Redux frontend and a Node.js/Express backend with MongoDB and PostgreSQL. Developed and maintained a client-facing React Native app, ensuring full compliance with WCAG 2.0 accessibility standards.

Worked in AWS-based environments, using S3, EC2, Route 53 and Elastic Load Balancing to support deployment and infrastructure for frontend tooling and applications. Kicked off the migration of Fury — MercadoLibre's largest internal frontend, a micro-frontend architecture where independently-deployed apps coexisted — from Angular 1 to React, adopting hooks API and modern function components. Built internal DevEx tooling to speed up frontend teams: NPM boilerplate packages and a CLI to scaffold WebDriverIO setups in a single command. Developed a dashboard that surfaced per-PR test coverage, reading CI-generated reports by commit hash and displaying an expandable per-file breakdown. Introduced and evangelized end-to-end testing across frontend teams, delivering hands-on talks at multiple MercadoLibre offices. Operated and maintained CI/CD pipelines in Jenkins — debugging build failures via log analysis, enforcing a 90% coverage threshold on GitHub checks, and running a rotating on-call to keep teams unblocked.

Built intive's test automation solution from the ground up as the company's first automation engineer, using C#, Selenium and the Page Object Model. Was the first engineer assigned to Intelligize — which grew into intive's largest project — running automated feature testing and manual regression testing for production releases.

Developed an internal C# application to help managers track expenses and cash flow. Led a proof of concept to migrate the team's UI automation from CodedUI to Selenium.