Antônio MascarenhasFrontend

Area of expertise

I worked as a frontend developer, developing and evolving web applications across the company's ecosystem—from custom-built products for clients to internal applications, as well as institutional sites and blogs. I worked both on maintaining systems already in production and on developing new products, from specific features to applications where I was the main person responsible for the frontend. I started with a focus on implementing interfaces and features and, over time, began taking part in defining flows, prototyping, and developing products from the ground up. In some projects, I joined discussions with Product, Design, and other teams to understand the problem, evaluate alternatives, and define how the solution would be implemented. I also became more directly involved with UI/UX and the Design System, creating prototypes, redesigning interfaces, proposing flow changes, and participating in reviews with the Design team. These decisions ranged from screen organization to usability, accessibility, visual feedback, and reducing the number of steps in a flow. Beyond implementation, I started taking on problems that required investigation and technical decision-making. For example, I implemented access rules on the frontend when the API didn't provide that control, investigated issues that only happened in production, and refactored existing applications, including legacy systems. I also built reusable solutions when I identified problems that repeated across different projects, such as interface inconsistencies and rework in component implementation. My work remained focused on frontend, but it gained more autonomy over time: from implementing defined features to also taking part in interface decisions, proposing solutions, investigating problems, and owning the frontend of products from initial development through their ongoing maintenance and evolution in production.