Luiz Oliveira

Frontend Developer — React / Next.js

I transform ideas into functional, fast, and modern digital products, designed to be accessible, scalable, and easy to maintain, always paying attention to the details that enhance the user experience.

Experience4+ years of experience

LocationOurinhos, SP, Brazil

EducationSystems Analysis and Development

Projects

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MoveTasks2025

Application that allows the user to organize their tasks into columns

React TypeScript Tailwind CSS shadcn

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Cashly2025

Application that allows users to manage their expenses

Next.js TypeScript Tailwind CSS shadcn Prisma PostgreSQL

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Instaject2022

Application that allows users to publish their projects and see publications from other users

Next.js Tailwind CSS Firebase TypeScript

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Mediafy Mobile2022

Mobile application that lists films and series based on data provided by the TMDB API

React Native TypeScript

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Technologies

TypeScriptJavaScript with typing

ReactJavaScript Library

Next.jsReact Framework

Tailwind CSSCSS Framework

shadcnUI Component Library

Ant DesignUI Component Library

Redux ToolkitState Management Library

GitVersion Control System

JestJavaScript Testing Framework

Experience

Frontend Developer
CIGAM · Mar 2025 - present
- Structured the services layer by centralizing API integrations into a single HTTP client. This standardized error handling and internationalized messages, which were previously handled individually in each request.
- Created reusable templates for new modules, replacing manual structuring from scratch with a ready-made, standardized base, eliminating structural duplication and styling inconsistencies between modules.
- Structured the front-end architecture with a focus on componentization, reusability, and separation of concerns, making the project easier to maintain and increasing component reuse.
- Developed reusable form components, with base versions and versions integrated with React Hook Form, abstracting library-specific properties for other developers.
- Implemented a suite of 330 automated tests using Vitest and React Testing Library, covering components, hooks, contexts, and pages, including both new and existing functionality.
- Implemented accessibility improvements across the system, including full keyboard navigation, aria-label attributes, and visual focus indicators, resolving an outstanding item for the application.
Frontend Developer
Brajan Sistemas · Sep 2022 - Oct 2024
- Responsible for migrating the company's core system from desktop to web, developing more than 50 modules with React, TypeScript, Ant Design, styled-components, Redux, and RTK Query.
- Optimized application performance by identifying and reducing unnecessary re-renders caused by state updates in parent components, using React DevTools Profiler and memoization.
- Implemented production error monitoring with Sentry, enabling quick identification of the flow causing failures and reducing the need to manually reproduce reported issues.
- Implemented application responsiveness, which was initially desktop-only, expanding system access to tablets and other mobile devices.

Frontend Developer
CIGAM · Mar 2025 - present
- Structured the services layer by centralizing API integrations into a single HTTP client. This standardized error handling and internationalized messages, which were previously handled individually in each request.
- Created reusable templates for new modules, replacing manual structuring from scratch with a ready-made, standardized base, eliminating structural duplication and styling inconsistencies between modules.
- Structured the front-end architecture with a focus on componentization, reusability, and separation of concerns, making the project easier to maintain and increasing component reuse.
- Developed reusable form components, with base versions and versions integrated with React Hook Form, abstracting library-specific properties for other developers.
- Implemented a suite of 330 automated tests using Vitest and React Testing Library, covering components, hooks, contexts, and pages, including both new and existing functionality.
- Implemented accessibility improvements across the system, including full keyboard navigation, aria-label attributes, and visual focus indicators, resolving an outstanding item for the application.
Frontend Developer
Brajan Sistemas · Sep 2022 - Oct 2024
- Responsible for migrating the company's core system from desktop to web, developing more than 50 modules with React, TypeScript, Ant Design, styled-components, Redux, and RTK Query.
- Optimized application performance by identifying and reducing unnecessary re-renders caused by state updates in parent components, using React DevTools Profiler and memoization.
- Implemented production error monitoring with Sentry, enabling quick identification of the flow causing failures and reducing the need to manually reproduce reported issues.
- Implemented application responsiveness, which was initially desktop-only, expanding system access to tablets and other mobile devices.