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eltonleao

About

Tech Lead at Cadastra. 7+ years of professional e-commerce development.

I lead implementation and evolution squads, running VTEX IO and FastStore for major brands. I built cadastra-docs and led the AIvengers Initiative.

Postgraduate student in Software Engineering with Applied AI (UniPDS). Always looking for connections across disciplines.

Based in Petrópolis, RJ.

Stack

Core — daily use
React Next.js TypeScript Node.js VTEX IO FastStore GraphQL Git AI/LLMs WordPress Python Firebase
Proficient — frequent use
Astro Tailwind CSS PHP Laravel PostgreSQL MySQL Docker AWS Figma
Explored — have worked with
Vue.js Angular MongoDB React Native Godot

Languages

Portuguese native
English fluent
Japanese N5
Spanish learning

Beyond the code

My obsession is Systems Thinking — understanding how systems work, self-organize and emerge. Code is just one of the lenses; the same logic shows up in organizations, ecosystems and consciousness itself. In practice, this shapes how I structure projects, spot bottlenecks and design architectures.

I study philosophy, theater and music, practice Tai Chi and I'm always trying to learn a new language.

I also write Code Poetry — code you read as literature and run as a program. The structure carries the emotional weight. A missing return isn't just a metaphor — it's literally why the program prints undefined.

Contact


Journey

Cadastra

Aug 2025 – present

Tech Lead

Technical leadership of multiple implementation and evolution squads across VTEX IO and FastStore. 20+ projects in the period for global brands and national leaders: B2B with financial integration (Panasonic + Credix CrediPay), O2O marketplace via WhatsApp (Bridgestone), high-volume omnichannel retail (Polishop), FastStore with quiz, loyalty and 50+ CMS sections (Mantecorp Skincare / Hypera Pharma), iHypera and Herbíssimo. I conceived the AIvengers Initiative (53% reduction in dev time using a scientific method) and built cadastra-docs (a centralized technical knowledge base).

VTEX IO FastStore React TypeScript Node.js GraphQL Apollo Tailwind CSS AI/LLMs Claude Code Figma MCP Docker GitHub Actions

EltonLeao Tech LTDA

2026 – present

Founder & Full Stack Developer

My own company. Custom software development, solution architecture consulting and technical training.

React Next.js Node.js TypeScript Tailwind CSS PostgreSQL

Cadastra (ex-Maeztra)

Jun 2024 – Aug 2025

Full Stack Developer

Front-end development and integrations for VTEX IO and FastStore e-commerce. Custom React components and GraphQL/Apollo integrations. Cases: Universal Music Brasil (B2C + B2B portal for distributors), Klabin ForYou (B2B+B2C with profile-based rules), TENA Multi-Country (monorepo ~15 apps across BR/AR/PE/CL), Madesa, Jequiti, Cassol Centerlar, Zona Sul Supermercados, Creamy Skincare, Casa do Fitness and For a Better World.

VTEX IO FastStore React TypeScript Node.js GraphQL Apollo Tailwind CSS

People Interactive Brasil

Jan 2024 – Jun 2024

Full Stack Developer (Outsourcing — Zona Sul Supermercados)

Outsourcing placement on the VTEX IO e-commerce team of Zona Sul Supermercados (a traditional RJ chain, 60+ years, 50+ stores). End-to-end work across the full scope of a VTEX IO store: React storefront components (PDP, PLP, Home, Cart, Checkout), Node.js backend apps with GraphQL resolvers, REST integrations, Site Editor, Store Framework, Master Data, analytics Pixel Apps, performance, SEO and troubleshooting.

VTEX IO React TypeScript Node.js GraphQL Apollo REST APIs Store Framework Site Editor Master Data Pixel Apps

Vinci Agência Digital

Oct 2022 – Jan 2024

Full Stack Developer

Worked in parallel on multiple VTEX (CMS and IO) and WordPress projects with direct client interaction. Integrations, store customizations, performance, UX/UI and conversion strategies. Cases: Otima Gráfica (VTEX IO), Carone (ES supermarket chain), Lecasa (home center), Catharine Hill, Kian Lighting/Store, Metallica Acessórios, Rayco, Rede Elétrica and Refitt.

VTEX IO VTEX CMS WordPress PHP React Apollo GraphQL JavaScript MySQL HTML/CSS

Maxisite Internet Solutions

Dec 2019 – Oct 2022

Full Stack Developer

Software factory with full stack deliveries. Cases: Cartão Fidelidade Digital (PHP web admin + Ionic/Angular mobile app published on the Play Store, with Firebase), 4Unik (PHP + Vue.js), Maxipost (logistics), Viterbo, Laboratório Baffi, Protetic, Village and Wilcos. Onboarding and technical mentoring of new team devs.

PHP Laravel Lumen CakePHP Vue.js Angular Ionic Cordova Firebase jQuery Sass Bootstrap MySQL Apache AWS

Happy Code Petrópolis

Jan – Dec 2019

Programming, Games, Robotics & Maker Teacher

Programming, games, robotics and maker teacher for children and teenagers, equipping them with 21st Century Skills through the Lean Education Technology (LET) method. Classes in Scratch and Godot 2D programming, Arduino prototyping, basic electronics, digital art and educational robotics. Lesson planning, learning assessment and developing original projects with students.

Scratch Godot GDScript Arduino Eletrônica HTML CSS JavaScript Método LET

Kumon Petrópolis Imperador

Aug 2014 – Jan 2019

Math, Portuguese, English & Japanese Tutor

Multidisciplinary tutor in the Kumon self-learning method, supporting students across all four subjects (Math, Portuguese, English and Japanese) over nearly 5 years. One-on-one support, progress tracking and building the first digital tools for internal student and materials management.

Método Kumon Didática multidisciplinar Japonês (JLPT N5) Gestão de alunos

Professor Particular

2014 – 2019

Physics, Math & Computing

Private tutoring tailored to each student's needs in Physics, Math and Computing (computer use, Office suite and introduction to programming). Focus on conceptual clarity, real problem-solving and building a logical-reasoning mindset alongside my Physics studies.

Física Matemática Informática Didática personalizada Word/Excel Lógica de programação

ILS Brechó (hoje ILS Ateliê)

Dec 2013 – Jan 2019

Co-founder & Sole Proprietor

My first business — I opened a fashion company in Petrópolis as a family partnership. Responsible for sales, cashier, inventory, marketing, visual identity and the store's physical operation. The business evolved into ILS Ateliê (party dress rentals), still active today with 3K+ Instagram followers.

Empreendedorismo Vendas Gestão de estoque Marketing Comunicação visual Atendimento direto

Education

Software Engineering with Applied AI

UniPDS

2026 – in progress

Systems Analysis and Development

Estácio

2022 – 2024

Information, Communication and Entertainment Technology

FAETERJ Petrópolis

2018 – 2020

Physics Teaching Degree

CEFET Petrópolis

2014 – 2016

Complementary courses

Next.js com Filipe Deschamps

curso.dev · 2023 – 2024

Ignite (React, Node.js, Java, Elixir)

Rocketseat · 2022 – 2024

Certifications

VTEX IO · 2025 Implementation Success Management · 2025 VTEX IO Descomplicado · 2025 Aprofundando em Hooks · 2025 Fundamentos do React · 2024 Programação para Internet · 2024 Programação de Sistemas de Informação · 2024 Programação de Algoritmos Escaláveis · 2024 Método Lean Education Technology (LET) · 2019 Ética — Prof. Clóvis de Barros Filho · 2014 JLPT N5 (日本語能力試験) · 2012 Concurso de Oratória de Língua Japonesa · 2009