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Gilberto Freitas Junior

@gilbertofreitasjunior

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Fullstack Software Engineer focused on scaling web apps and improving conversion, performance, and productivity.

Brazil

Message

What I'm looking for

I’m looking to build and scale customer-facing web products where I can improve conversion, performance, and developer productivity—using React/TypeScript/Node.js, strong frontend architecture, and CI/CD automation in a collaborative, fast-moving team.

I’m a Fullstack Software Engineer with 5+ years of experience building and scaling web applications using React, TypeScript, Node.js, and SQL. I care about modern frontend architecture, performance optimization and automations that helps teams ship faster.

Most recently, at Crewfare, I developed and shipped customer-facing features for an event-travel platform serving over 100,000 monthly users. I rebuilt a legacy booking platform using React and TypeScript, contributing to a 2× increase in conversion rate, while reducing technical debt by modernizing the architecture.

At Harmonit, I implemented features and optimizations on an ERP system, driving a 60% decrease in page load times. I also enhanced UI performance by 40% with React, TypeScript, and TailwindCSS, and mentored 6 new developers to improve code quality and delivery efficiency.

Earlier at FRG Informática, I developed a scalable web ERP application for over 10,000 users and streamlined loading by creating a multi-modular microfrontend system with Single-SPA. My training strengthened my fundamentals across web programming, HTML/CSS/JavaScript, and REST APIs—so I bring both product impact and engineering rigor to every project.

Experience

Work history, roles, and key accomplishments

Current

Software Engineer

Current

Crewfare

Feb 2025 - Present (1 year 4 months)

Developed and shipped customer-facing features for an event-travel platform serving 100,000+ monthly users. Rebuilt the booking platform with React and TypeScript, doubling conversion rate, and reduced technical debt by modernizing legacy frontend architecture.

React TypeScript Frontend Architecture Performance Optimization Technical Debt Reduction Conversion Rate Optimization Travel Platform

Software Engineer

Harmonit

Nov 2023 - Oct 2024 (11 months)

Implemented ERP features and performance optimizations, reducing page load times by 60%. Improved UI performance by 40% with React, TypeScript, and TailwindCSS, collaborating with 20+ developers and mentoring 6 new developers.

React TypeScript TailwindCSS Performance Optimization ERP Systems Team Collaboration Mentorship

Software Engineer

FRG Informática

Apr 2021 - Nov 2023 (2 years 7 months)

Built and scaled a web ERP application for 10,000+ users using React and TypeScript, improving operational efficiency. Streamlined application loading by 60% through packaging enhancements and a multi-module microfrontend architecture with Single-SPA.

React TypeScript Performance Optimization

Trainee Developer

FRG Informática

Completed 40+ web development courses in 8 months, building a strong foundation in HTML, CSS, JavaScript, and REST APIs. Collaborated with teammates to troubleshoot and debug code to ensure software functionality.

HTML CSS JavaScript REST APIs Debugging Team Collaboration Troubleshooting