Kayo Souza

Full Stack Developer

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I'm a Frontend-focused Full Stack Developer with over 8 years of hands-on experience building scalable web applications with React.js, Next.js, TypeScript, and Node.js. I have delivered high-performance interfaces and full stack solutions across different industries. I also volunteered at Brainly, where I created tools that automated content moderation on the platform.

Languages and tools

  • JavaScript
  • TypeScript
  • Node.js
  • React
  • Next.js
  • Electron
  • HTML
  • CSS
  • Sass
  • Tailwind CSS
  • Python
  • C
  • C++
  • C#
  • Go
  • Java
  • Android Studio
  • React Native
  • MySQL
  • PostgreSQL
  • MongoDB
  • PHP
  • Vue
  • Vite
  • Vitest
  • Mantine
  • Git
  • Jest
  • Mocha
  • Cypress
  • Gulp
  • Figma
  • Styled Components

Experience

Front-End Developer

Estúdio Haus · Montes Claros, MG, Brazil · Remote

April/2024 — Present
  • Developed responsive web applications using React.js and Next.js, improving Lighthouse performance score from 55 to 98 on mobile.
  • Built reusable UI components with Tailwind CSS, Styled-Components, and Material UI (MUI).
  • Implemented secure authentication flows with access and refresh tokens.
  • Integrated REST APIs using Next.js Server Functions and resolved production CORS and browser compatibility issues.
  • Developed CI/CD pipelines on Azure and collaborated in Agile (Scrum) processes.

LLM AI Trainer

Revelo · Miami, FL, USA · Remote

December/2025 — Present
  • Evaluated AI-generated outputs for technical accuracy across TypeScript, Python, Java, and Go.
  • Provided structured feedback on code quality and correctness.
  • Designed prompts from real technical scenarios to guide LLM refinement and alignment.

Full Stack Developer

Suporte Leilões · Montes Claros, MG, Brazil · Remote

September/2023 — December/2025
  • Developed full stack features using PHP, Symfony, Vue.js, and Twig.
  • Built a CLI automation tool reducing manual tasks by up to 15 minutes per operation.
  • Created scripts for ERP data processing using RegExp.
  • Built and maintained API endpoints for frontend integration.

Education

Universidade Anhanguera

Associate's Degree in Systems Analysis and Development

July/2023 — December/2025
IFNMG

Technical Degree in Internet and Web Technologies

August/2023 — March/2025
SENAI

Technical Degree in Quality Control

August/2022 — July/2023

Contact

Email: +p