Wallace Ferreira

About me

My professional values

• Delivering high-quality software through clean architecture, thorough testing, and disciplined code review.

• Shipping solutions quickly and iteratively while maintaining quality and architectural integrity.

• Comfortable across the full stack, from domain modeling and APIs to UI, accessibility, and performance.

• Clear communication with teammates and stakeholders to align expectations and deliver with confidence.

Experience

• 

  Frontend Software Engineer

  FDTE - Fundação para o Desenvolvimento Tecnológico da EngenhariaOct 2024 - May 2026 (1 year 7 months)

  São Paulo, BrazilFull-timeRemote

  • Architected and built an embeddable AI chatbot widget using React, Vite, and TypeScript, delivered via script tag to run across client websites without depending on the host application stack.
  • Integrated the AI assistant with backend services to support tee time availability, waitlist flows, and FAQ interactions, contributing to a product used across a network of 800+ golf course clients.
  • Rebuilt a compiled vanilla JavaScript animation system into a state-driven React and Framer Motion implementation for a Shopify app, improving maintainability across multiple buyer offer states.
  • Diagnosed CSS leakage issues across unpredictable Shopify storefront themes and implemented Shadow DOM isolation, reducing integration risk and making the widget more reliable across merchant stores.
  • Contributed across storefront and merchant admin experiences using React, TypeScript, Vite, Shopify Polaris, App Bridge, and Theme App Extensions, helping deliver the MVP within a fixed deadline in a distributed Brazil/US team.

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  • TypeScript
  • React
  • +5
• 

  Frontend Software Engineer

  GalaxiesOct 2023 - Dec 2023 (2 months)

  São Paulo, BrazilPart-timeRemote

  • Owned the full rewrite of a dynamic survey builder from v1 to v2 in three weeks using React, TypeScript, GraphQL, and Material UI, delivering the new version to production within the agreed deadline.
  • Preserved full backward compatibility with legacy survey schemas, allowing existing forms to keep loading correctly without requiring data migration or downstream renderer changes.
  • Redesigned the form state management model to track only the active editing scope instead of keeping the entire form in memory, improving maintainability and performance for complex surveys.
  • Rebuilt the survey creation experience with a simpler and more predictable structure, enabling administrators to configure surveys independently without relying on the original developer.
  • Applied patterns from previous complex form-building experience to balance flexibility, usability, and technical simplicity under a tight delivery window.

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  • TypeScript
  • React
  • +1
• 

  Fullstack Software Engineer

  WESF IT ServicesSep 2023 - Apr 2024 (7 months)

  São Paulo, BrazilFull-timeRemote

  • Built a full-stack B2B e-commerce platform from greenfield to production using React, TypeScript, Node.js, Express, PostgreSQL, Docker, and AWS, covering both the public institutional website and the private retailer storefront.
  • Designed and implemented a gated B2B access flow with email confirmation, manual retailer approval, and authenticated catalog access, protecting negotiated pricing from public visibility and competitors.
  • Developed a custom B2B pricing engine to calculate customer-specific quotes at request time, supporting more complex commercial rules than a traditional public e-commerce flow.
  • Implemented catalog and quote workflows for approximately 2,000 SKUs across 6 represented brands, including bulk product import, cart, quote generation, order flow, and automatic quote expiration.
  • Deployed a containerized Node.js/PostgreSQL application on AWS, using S3 and CloudFront for product image delivery and Sentry for production monitoring.

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  • TypeScript
  • React
  • +6
• 

  Frontend Software Engineer

  FDTE - Fundação para o Desenvolvimento Tecnológico da EngenhariaMar 2020 - May 2023 (3 years 2 months)

  São Paulo, BrazilFull-timeHybrid

  • Contributed to Fieldlink, a workflow-driven platform, by building dynamic custom forms with React, Formik, and JSON schemas, enabling client-specific data collection flows generated and rendered at runtime.
  • Rebuilt a form builder from v1 to v2, supporting nested fields, complex field types, and real-time validation while preserving compatibility with the existing custom forms schema structure.
  • Architected a React MQTT integration library based on a previous JavaScript implementation, abstracting Flow Build framework methods, broker communication, and front-end integration points into a reusable package for client applications.
  • Contributed to the rebuild of a high-impact e-commerce platform that generated millions of BRL in monthly sales, helping define the front-end architecture and build design system components for scalable product interfaces.
  • Mentored junior developers by supporting onboarding, explaining front-end patterns, reviewing implementation approaches, and helping them navigate React, TypeScript, and project-specific architecture.

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  • TypeScript
  • React
  • +6