Open to opportunities

João Guilherme

@jooguilherme

Senior full-stack software engineer building scalable, serverless, high-traffic web platforms with AI-assisted delivery.

Brazil

Message

What I'm looking for

I’m looking to grow into technical leadership by owning scalable, high-traffic products end-to-end—serverless and performance-focused—while collaborating cross-functionally to ship reliable features on time and within budget.

I’m a Senior Software Engineer with over 8 years of experience designing scalable solutions for high-traffic platforms. I specialize in serverless architecture, headless e-commerce, and performance optimization using React, Next.js, Node.js, and TypeScript—building systems focused on reliability and fault tolerance.

In recent roles, I architected serverless MVPs with AWS Lambda, Node.js, and Next.js, built APIs handling thousands of daily transactions, and used Claude Code and Cursor (with MCP integrations) to accelerate implementation, testing, documentation, and code review. I’ve also delivered measurable impact in international e-commerce (e.g., performance and analytics with SSR, caching, GA4, micro-frontends with Turborepo) while pursuing an MBA in Strategic IT Management at PUC Minas to prepare for technical leadership roles.

Experience

Work history, roles, and key accomplishments

Current

Full Stack Engineer

Current

SI Tickets

Mar 2025 - Present (1 year 4 months)

Architected and developed a serverless MVP using AWS Lambda, Node.js, and Next.js for a high-traffic ticketing platform. Built scalable APIs and database/backend logic for high-volume transactions, adopting AI coding tools across the development workflow.

AWS Lambda Node.Js Development Next.js Serverless Architecture DynamoDB PostgreSQL API Development Database Design TypeScript React Performance Optimization Fault Tolerance Claude Code Cursor MCP Testing Documentation Code Review

Full Stack Engineer

VML

Sep 2024 - Mar 2025 (6 months)

Architected headless e-commerce solutions with Next.js, GraphQL, BigCommerce, and Bloomreach, focusing on personalization and performance. Implemented GTM with GA4 event tracking and built micro-frontend and optimization strategies for enterprise environments.

Next.js React TypeScript GraphQL BigCommerce TurboRepo Caching GTM GA4 I18next

Frontend Software Engineer

Renner

Sep 2023 - Sep 2024 (1 year)

Developed and maintained Renner’s website using React and Next.js, improving user experience and increasing website traffic through internationalization. Implemented micro-frontends with Turborepo, integrated GraphQL APIs, and added automated testing with Jest to reduce production bugs.

React Next.js TypeScript TurboRepo I18next GraphQL Jest Context API Zustand

Frontend Software Engineer

Evino

Jan 2023 - Sep 2023 (8 months)

Built and maintained e-commerce platforms with React, Redux, and Styled Components to support responsive, high-transaction experiences. Implemented testing and CI/CD with Jest, React Testing Library, and tools including CircleCI, Rancher, and AWS, and contributed to migrating legacy systems to Magento and to internal A/B testing tooling.

React Redux styled components Jest React Testing Library GitHub CircleCi Rancher AWS CI CD Magento MongoDB A B Testing

Frontend Software Engineer

Movidesk

Mar 2022 - Jan 2023 (10 months)

Developed and managed online/offline helpdesk chats supporting millions of daily visits using React, Redux, and WebSocket. Created an internal design system library with Styled Components, Storybook, and Turborepo, and migrated a legacy jQuery application to React to improve performance and scalability.

React Redux Redux Saga WebSockets styled components Storybook TurboRepo Jest React Testing Library Cypress Migration jQuery

Frontend Software Engineer

Jussi

Jun 2021 - Mar 2022 (9 months)

Developed and maintained e-commerce platforms for Whirlpool using React and Vtex, including new front-end features with React, Redux, and Styled Components. Ran testing with Jest and React Testing Library and leveraged metrics analysis and A/B tests to boost B2B sales conversion.

React Redux styled components Jest React Testing Library VTEX A B Testing Metrics Analysis

Software Engineer

DPC

Nov 2019 - Jun 2021 (1 year 7 months)

Developed front-end functionalities for e-commerce platforms using Vue, improving user navigation and shopping efficiency. Implemented backend functionalities with Laravel and MongoDB and built microservices using React, Redux, and Styled Components.

Vue Vuex SASS React Redux Redux Saga Laravel Docker Postgres MongoDB Microservices

Software Engineer

VersaTec

Apr 2018 - Mar 2019 (11 months)

Developed and maintained websites and e-commerce platforms using WordPress and created responsive landing pages to support digital marketing. Provided technical support and training to clients.

WordPress HTML CSS JavaScript Responsive Design