Hi, I am

Rafael Miguel

• FullStack Developer
• Mobile Developer
• Kotlin Tech Lead

FullStack and Mobile Developer with 3+ years of experience building scalable, high-performance web, desktop, and mobile applications. Currently serving as Kotlin Development Tech Lead, leading mobile delivery, prioritizing tasks, coordinating meetings, and guiding implementation decisions.

years of experience

3+

concurrent roles

2

spoken languages

3

01About

Strong background in React, Vue, Next.js, NestJS, Node.js, Kotlin, Flutter, PostgreSQL, Prisma, Firebase, AWS, Electron, and Web3 integrations using WalletConnect, Infura, Thirdweb, and Coinbase SDK. Experienced in accessibility-oriented digital products, EPUB and Web Publication workflows, secure authentication, responsive interfaces, and performance optimization across platforms. Also builds specialized AI agents with Claude, applied to development and code review workflows.

Technical skills

• Front-end

  Responsive UI, accessibility, and performance optimization.

  • React
  • Vue
  • Next.js
  • TypeScript

• Back-end

  REST APIs, authentication, and data modeling.

  • Node.js
  • Express
  • NestJS
  • Prisma

• Mobile / Desktop

  Cross-platform development for Android and desktop.

  • Kotlin
  • Android
  • Flutter
  • Electron

• Databases & Cloud

  Database modeling and scalability.

  • PostgreSQL
  • Firebase
  • AWS

• Web3

  NFT and token transactions, multi-wallet support.

  • WalletConnect
  • Infura
  • Thirdweb
  • Coinbase SDK

• AI & agents

  Specialized AI agents built with Claude for development and code review.

  • Claude
  • Claude Code

• Leadership

  Task prioritization, delivery planning, team coordination.

  • Tech leadership
  • Delivery planning
  • Mentoring

02Experience

1. 2024 — Present

   Tech Leader — Kotlin Development

   NEES — Núcleo de Excelência e Tecnologias Sociais

   • Lead the mobile application development team, coordinating delivery routines, task prioritization, and technical alignment for Kotlin-based development.
   • Lead meetings, organize deliverables, and support the team in translating product requirements into implementation plans.
   • Develop and maintain features across mobile, web, and desktop platforms using Kotlin, React, and Electron.
   • Implement accessibility-focused features including keyboard navigation, screen reader support, and inclusive user flows.
   • Build and maintain secure authentication flows with NestJS, contributing to stronger application security and maintainability.
   • Optimize front-end performance and responsiveness across different devices and usage contexts.
   • Kotlin
   • React
   • Electron
   • NestJS

2. 2025 — Present

   FullStack Web Developer

   EDGE — Centro de Inovação

   • Develop and maintain web applications using Vue, Node.js, Express, Prisma, and PostgreSQL.
   • Design and optimize database schemas with focus on integrity, scalability, and maintainable data relationships.
   • Implement RESTful APIs and integrate them with dynamic front-end interfaces.
   • Develop cross-platform mobile applications with Flutter in a parallel project within the same organization.
   • Collaborate with multidisciplinary teams to deliver features from concept to deployment.
   • Vue
   • Node.js
   • Express
   • Prisma
   • PostgreSQL
   • Flutter

3. 2023 — 2023

   FullStack Web3 Developer

   Labbit Space Inc.

   • Developed new features and maintained existing web platforms with focus on performance and user experience.
   • Implemented Firebase Authentication from scratch, improving application security and onboarding experience.
   • Optimized front-end performance using techniques such as lazy loading and tree shaking.
   • Integrated Web3 toolkits including Thirdweb, WalletConnect, Coinbase SDK, and Infura to support NFT transactions, token transactions, and multi-wallet functionality.
   • Firebase
   • Thirdweb
   • WalletConnect
   • Coinbase SDK
   • Infura

03Selected projects

• MathType

  Visit ↗

  Mental math competition, monkeytype style

  • Built with Next.js and Firebase, with server-signed scoring, a global leaderboard, and an interface translated into seven languages.
  • Next.js
  • TypeScript
  • Firebase
  • Tailwind

• PNLD Digital

  Mobile application for the National Textbook and Educational Materials Program

  • Developed mobile application features focused on accessibility, performance, and digital reading experiences.
  • Worked with EPUB and Web Publication concepts, supporting educational content delivery and inclusive reading flows.
  • Kotlin
  • Android
  • EPUB
  • Accessibility

• Freckle Live

  Live streaming platform

  • Developed front-end architecture and applied performance optimization techniques to deliver a responsive, fast experience across devices.
  • React
  • Performance

• PolyBots Game

  Web3 game platform

  • Integrated Web3 functionality including NFT support and wallet connectivity with Thirdweb and Infura, strengthening the platform blockchain capabilities.
  • Thirdweb
  • Infura
  • NFT