Profile
About me
Hello! My name is Rangel
Software Engineer | Developer | Android Specialist
Bachelor in Information Systems, passionate about learning, creating, and innovating. I develop technological solutions that transform ideas into efficient and modern digital products, optimizing processes and delivering high-impact functional experiences.
I work as a software engineer with a focus on mobile application development (Native Android), participating in all stages of the development cycle: requirements gathering, architecture, implementation, testing, publishing, and maintenance.
I have an established presence on the Google Play Store, with apps that have accumulated over 10,000 downloads and positive reviews. I am the creator of "Traveler’s Guide," an app for fans of the game Genshin Impact, available in Portuguese and English, with an average rating of 4.8 and praised by the community for its practicality and quality.
In addition to mobile development, I work with different technologies and platforms, contributing to collaborative projects and multidisciplinary teams, combining technical expertise and strategic vision to deliver robust, creative, and relevant solutions..
Skills
Software Engineering
Software Engineering
Architecture
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1+ MVC
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1+ MVVM
Methodologies
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1+ Scrum
Version Control
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1+ Git
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1+ GitHub
Quality
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1+ Unit Tests
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1+ Integration Tests
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1+ Automated Tests
Back-End
Back-End
Languages
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1+ PHP
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1+ Node.js
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1+ Python
Frameworks
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1+ Express
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1+ Laravel
Front-End
Front-End
Languages & Markup
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1+ HTML
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1+ CSS
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1+ JavaScript
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1+ TypeScript
Frameworks & Libraries
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1+ React
CSS Frameworks
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1+ Bootstrap
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1+ Tailwind CSS
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1+ Material UI
UI/UX
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1+ Responsive Design
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1+ Prototyping
Mobile (Android)
Mobile (Android)
Native
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1+ Java
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1+ Kotlin
Jetpack Architecture
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1+ ViewModel
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1+ LiveData
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1+ Room
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1+ WorkManager
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1+ Hilt
Jetpack UI Toolkit
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1+ Jetpack Compose
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1+ Material Design 3
Publishing
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1+ Google Play
Mobile (Cross-Platform)
Mobile (Cross-Platform)
Cross-Platform
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1+ React Native (JavaScript/TypeScript)
Publishing
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1+ Google Play
Databases
Databases
Relational
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1+ MySQL
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1+ PostgreSQL
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1+ SQL Server
Developed Projects
Projects designed, planned, developed and maintained by me.
Traveler's Guide
A tool for Genshin Impact players that gathers various useful information to help progress in the game, such as: characters and recommended builds, weapons and artifacts, materials and their sources, enemies and their rewards.
Available for Web and Mobile platforms, in Portuguese and English.
10+ thousand downloads on the Google Play Store.
Mobile
Native Android app built with MVVM architecture, combining Java and Kotlin to organize screens, business rules, and local persistence with SQLite/Room. The implementation includes game-data organization, content handling, multilingual support, Firebase, Google Analytics and AdMob integrations, plus publishing, maintenance, and LGPD-oriented privacy practices.
Links
Languages
Competencies
Web
Web application built with PHP, JavaScript, and Bootstrap, organized with an MVC structure to deliver the guide content responsively. The implementation covers SQL/SQLite and JSON data organization, auxiliary Python routines, Firebase and Google Analytics integration, multilingual support, Git/GitHub version control, and privacy care aligned with LGPD.
Links
Languages
Competencies
Profeed
A tool for Instagram users to organize their feed and ensure their media maintains high quality when published on the platform.
Available for the Mobile platform, in Portuguese.
5+ thousand downloads on the Google Play Store.
Mobile
Native Android app implemented with MVVM, Java/Kotlin, and local persistence with SQLite/Room to support visual media organization. The project integrates Instagram API-related resources, Firebase, Google Analytics, and AdMob, with a Google Play publishing flow, Git/GitHub version control, and privacy handling aligned with LGPD.
Links
Languages
Competencies
Web
Support web application developed with JavaScript, Node.js, Bootstrap, and Firebase, following an MVC organization for product presentation and integration. The implementation includes communication with external services, Google Analytics tracking, Git/GitHub version control, and attention to privacy and LGPD requirements.
Links
Languages
Competencies
Flappy Ninja
Flappy Ninja is a mobile application, a game developed with the goal of providing knowledge and participating in the SBGames Game Festival (2014). The game is available for Android devices on the Play Store.
Available for the Mobile platform, in Portuguese.
1+ thousand downloads on the Google Play Store.
Mobile
Android game developed in Java with AndEngine, structured for 2D rendering, collision handling, game loop, scoring, and local persistence with SQLite. The project also involved Google Play Store, AdMob, and Analytics integrations, code organization with Git/GitHub, and iterative development practices.
Links
Languages
Competencies
Projects Developed in Collaboration
Projects conceived, planned, implemented, and maintained by the entire team, of which I am a part as a researcher and technical leader.
Naepe Pesquisas
Website developed for NAEPE (Núcleo Aplicado de Estudos e Pesquisas Econômico-Sociais).
Publications
Web
Institutional website developed with PHP, JavaScript, Bootstrap, and Firebase, using an MVC organization to separate presentation, control, and data. The implementation includes responsive pages, content publishing, Google Analytics integration, Git/GitHub version control, and maintenance focused on communicating the center projects and research.
Links
Languages
Competencies
Sistema IPPC
A technical tool developed to solve a central problem in the field of Brazilian culture and cultural production: the lack of market data and reference value tables for cultural production.
Software Registration
Publications
Sistema IPPC - Programa de Computador
IFTO tem mais dois programas de computadores certificados pelo INPI
Pesquisadores do Tocantins criam software que promete transformar setor cultural brasileiro
NAEPE cria software que promete transformar o setor cultural brasileiro
Web
Full stack web system developed with PHP, JavaScript, SQL, JSON, Bootstrap, and Firebase, organized with MVC to support collection, structuring, querying, and presentation of reference data for cultural production. The implementation covers data modeling, business rules, responsive screens, information generation for analysis, Google Analytics tracking, and Git/GitHub version control.
Links
Languages
Competencies
Painel Agropecuário
A modern and accessible platform that centralizes strategic agricultural data in Tocantins, serving producers, researchers, and public managers with clear and up-to-date information.
Web
Full stack web platform created with PHP, Laravel, JavaScript, SQL, JSON, Python, Bootstrap, and Firebase to centralize and present agricultural indicators. The implementation involves MVC organization, data treatment and preparation, responsive visualization, Google Analytics integration, Git/GitHub version control, and maintenance of an accessible experience for technical consultation and decision-making.
Links
Languages
Competencies