Guilherme Rosário Alves

Belém, Pará, Brazil

Development and maintenance of GOL RH, a people management platform used by public agencies and companies across Brazil, with payroll, eSocial, time tracking and employee portal modules.

• Full stack work in Java and JavaScript on the company's in-house architecture (Servlets and JSP on Tomcat), with SQL Server and Oracle.
• Introduced the first automated unit tests (JUnit 5) into the main product's build.
• Wrote transactional, re-runnable T-SQL scripts to fix customer data, validated by automated tests against database snapshots.

• Java
• JavaScript
• JSP
• Servlets
• jQuery
• SQL Server
• Oracle
• Tomcat
• JUnit

São Paulo, Brazil

Senior React, React Native and Python developer on the HR app of Rede Américas, a hospital network whose employees use the app for time tracking, documents, personal data and support.

• End-to-end owner of AméricasIA, the app's virtual HR assistant.
• On mobile, built the chat module with Expo/React Native, TypeScript and React Query, featuring voice input with real-time transcription, locally persisted history (MMKV) and personalized suggestions.
• On the backend, was the main author of the Python/FastAPI API integrated with Gemini 2.5 Flash, with an agent that queries internal systems, knowledge-base ingestion from PDFs and cost optimizations such as context caching.
• Wrote about 165 automated tests (Jest, React Native Testing Library and pytest), working with Docker, LocalStack, AWS and deployments through GitHub Actions.

• React Native
• Expo
• TypeScript
• React Query
• Zustand
• MMKV
• Python
• FastAPI
• Gemini
• AWS
• Docker
• Jest
• pytest

Palmas, Tocantins, Brazil

Technical lead on the modernization of nTask, a management ecosystem for notary offices with more than 12 integrated production modules, such as Protest, RTD, RCPJ and Finance.

• Led the gradual migration of legacy PHP systems to modern Laravel, Vue.js 3 and TypeScript, preparing services for serverless execution on Google Cloud (Cloud Run and Cloud SQL).
• Worked on the ecosystem's Identity Provider (OAuth2, OIDC and SSO) and on electronic invoice (NF-e) integrations, with REST APIs, PostgreSQL, containers and pipelines on GitHub and Cloud Build.
• Drove architecture decisions and reviews of critical changes with the DevOps and SRE teams, formalizing technical standards through ADRs.

• PHP
• Laravel
• Vue.js 3
• TypeScript
• PostgreSQL
• Docker
• Google Cloud
• OAuth2
• OIDC

Colombo, Paraná, Brazil

Front-end development and maintenance of the BNE group's job portals (Banco Nacional de Empregos, Trabalha Brasil and RedTrabaje), used by candidates and companies across Brazil and Latin America.

• Worked mainly with Angular and TypeScript, building flows and evolving reusable components, as well as server-rendered pages in ASP.NET Core MVC (Razor).
• Worked on performance and SEO focused on Core Web Vitals, cutting TTFB by 35% and contributing to production stability (99.9% SLA).
• Implemented automated tests with Jest and Cypress and API checks with Postman to prevent regressions.

• Angular
• TypeScript
• JavaScript
• SCSS
• ASP.NET Core MVC
• Jest
• Cypress
• Postman
• Mixpanel

São Paulo, Brazil

Maintenance and evolution of the Flutter mobile app integrated with SoftGreen's ERP, built for small and mid-sized manufacturers in the foundry, plastics and food industries.

• The app brings routines such as stock lookup and movements, production reporting and order tracking to the shop floor and the warehouse.
• Built new screens and features and integrated the app with the system's APIs to keep data in sync with the ERP.

• Flutter
• Dart
• REST APIs

Rio de Janeiro, Brazil

Maintenance and evolution of internal web systems at Omint, a health plan and insurance company.

• Bug fixes, screen improvements and business requests handled with JavaScript, jQuery, HTML5 and CSS3.
• Automated repetitive data processing routines, reducing operational effort by 25%.

• JavaScript
• jQuery
• HTML5
• CSS3