Hi, I'm Marcelo! 👋

• VTEX | January/2021 - Present

  Senior Software Engineer

  • I'm the main maintainer of the VTEX Admin, the business face of VTEX where customers manage their ecommerce operations. The VTEX Admin is a large micro-frontend framework capable of dealing with both legacy and modern applications.
  • I led the effort to rewrite the VTEX Admin from scratch using a modern stack and infrastructure, increasing its availability to 99.999% and eliminating significant technical debt from previous vendor lock-in. This transformation enabled the company to ship new features and products faster.
  • To empower engineering teams, I developed the VTEX Admin Apps SDK—an internal developer platform that allowed all engineering teams (+50 applications) to self-serve and ship Admin Apps with ease. The SDK abstracted complexity and provided the necessary tooling, reducing time-to-market by 10x. I also played a key role in building the Shoreline Design System, used by hundreds of developers, and defined the architecture and best practices for building Admin Apps.
  • I led an initiative to instrument the runtime of legacy Admin Apps, enabling us to reduce errors from these applications by approximately 70%.
  • I'm a pioneer in AI Engineering at VTEX, leading the development of AI-driven products. I designed key components of VTEX's internal AI Platform, including Building Blocks that enabled engineering teams across the company to ship AI Agents autonomously. Building on the Admin Apps SDK, I also created an AI assistant capable of rewriting legacy Admin Apps into modern ones or generating new Admin Apps from scratch via prompt.
  • Beyond platform work, I've shipped products of all kinds: CLI tools, JavaScript libraries, Node.js services, and React applications. Highlights include a Global Search feature that saves 360 hours of customer time per month, a CLI that automated the migration of +100k accounts to the new Admin and allows all engineering teams to quickly rollout or rollback any VTEX IO app to customers, and a micro-service that streamlined observability data ingestion for front-end applications from several teams.

  Other Initiatives I Contributed To

  

  Nov 2025

  New contextual help in the Admin

  Simplified access to documentation without leaving your workflow. The interface offers fast, intuitive navigation with instant access to relevant documentation.

  View announcement

  VTEX

  Jul 2025

  VTEX Shield: Custom SSL Certificates and mTLS

  New protection layers with custom SSL certificates and mutual TLS (mTLS) for enhanced security.

  View announcement

  

  Oct 2024

  New error screen in the Admin

  Improved error communication with simplified visual experience, hidden technical details, and automatic reconnection.

  View announcement

  VTEX

  Oct 2023

  Search for orders in the Global Search bar

  Enhanced global search functionality allowing users to search for orders directly from the Admin search bar.

  View announcement

  VTEX

  Apr 2023

  Welcome to the redesigned VTEX Admin

  A complete redesign of the VTEX Admin with a modern interface, improved navigation, and enhanced user experience.

  View announcement

  VTEX

  Jul 2022

  VTEX Admin now available in Thai

  Expanding accessibility with Thai language support in the VTEX Admin interface.

  View announcement

  VTEX

  May 2021

  Admin navigation restricted by user role

  Enhanced security with role-based navigation restrictions, ensuring users only see relevant sections.

  View announcement

• soy.chat | April/2025 - Present

  Founder

  • I'm the founder of soy.chat, a SaaS platform that enables users to create websites with personalized AI-powered chatbots. Users can customize the look, feel, and knowledge base of their chatbots with just a few clicks.
  • soy.chat was born from celo.chat, my personal AI-powered interactive CV where visitors can chat with an AI version of me to learn about my career and skills. After building celo.chat, I realized the concept could help others, so I platformized it into soy.chat.
  • Built with a privacy-first approach: all data is encrypted with bank-grade encryption and stored on secure servers in Europe. No data selling, no advertising profiles—users own their data.

• Eu tive um sonho | August/2022 - Present

  Founder

  • This social network is a personal endeavor that I've been working on in my free time. It's a platform where users can share their dreams (the ones we have while sleeping), and connect with others through their dreams.
  • This project is a way for me to learn new technologies and experiment with ideas and tools, especially in the AI and NLP fields.
  • I self-host it on my own infrastructure, using small (3B to 8B) open-source Language Models running on Ollama behind a LiteLLM proxy—the same infrastructure that powers soy.chat.
  • Both services are fully instrumented with OpenTelemetry: LLM traces are sent to a self-hosted Langfuse instance for AI observability, while application metrics and traces go to a self-hosted SigNoz instance.

• Cubos | May/2019 - January/2021

  Software Engineer

  • At Cubos, I had the chance to work and contribute to a variety of projects on the ecommerce, fintech and edtech industries, using frameworks and technologies such as React, Node.js and Django, among others.
  • While at Cubos, I developed the ecommerce of the largest dancing platform from Brazil, FitDance, and enabled them to efficiently manage their ecommerce operations for their (at the time) +200k customers.
  • I was also responsible for developing a series of backend services and frontend platforms for the largest "Crédito Consignado" (Payroll Deduction Loan) platform of Brazil's public sector workforce on the Northeast Region, Credcesta, enabling the company to manage and process thousands of loans per month for their (at the time) 40k customers.

Education

• Federal University of Bahia | January/2014 - June/2021

  B.A. in Human Sciences

  • My education at the Federal University of Bahia was multidisciplinary, with a strong emphasis on Philosophy, Sociology, and Psychology. This foundation allowed me to explore diverse experiences.
  • Research: I played a key role in a research project investigating the health impacts of violence among different populations (infants, young adults, women, elderlies, etc.). This project resulted in the development and implementation of educational materials aimed at high schoolers.
  • Leadership: I volunteered for AIESEC, where I managed and sold international exchange programs for students and professionals.
  • Engineering: As part of the Formula SAE Team, I contributed to the development of the vehicle's telemetry system.
  • Teaching: I served as a teaching assistant for the Introduction to Sociology course, where I had the opportunity to guide students on their sociological journey through instruction and support.

Skills