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JOÃO VINÍCIUS GUERBER DE SOUZA

@joovinciusguerberdes

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Senior Software Engineer at Invillia who cut Casas Bahia Pay crashes by 98% and app loading time by 75%.

Brazil

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At Invillia, I work on Casas Bahia Pay, where I reduced weekly crashes by 98%, optimized memory use by 55%, and cut app loading time by 75% through React Native optimization and native code re-engineering.

I also developed AI-driven tools for PR reviews, test generation, and business documentation, and helped move automated test coverage from 0% to 40%. I’ve built a shared enterprise Design System and native React Native modules, and contributed to web and mobile products at WiiD – Work in Ideas.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer (Front-end & Mobile)

Current

Invillia

Sep 2025 - Present (1 year 1 month)

Engineered system-wide stabilization reducing weekly crashes by 98% and optimizing memory footprint by 55%. Led technical strategy, mentored developers, and implemented AI-driven tools to automate workflows.

React Native React TypeScript Kotlin Swift Fastlane GitHub Actions Azure DevOps Appdome Jest

Mid-Level Software Engineer (Front-end & Mobile)

Invillia

Sep 2024 - Sep 2025 (1 year)

Architected an enterprise Design System using Storybook and distributed it via GitHub Packages. Developed native modules and maintained robust mobile applications with a focus on scalability and testing.

React Native React TypeScript Storybook GitHub Packages Kotlin Swift Fastlane GitHub Actions Azure DevOps Jest

Mid-Level Mobile & Front-end Developer

WiiD – Work in Ideas

Jan 2024 - Sep 2024 (8 months)

Developed and maintained cross-platform applications and web interfaces using React, Next.js, and React Native (Expo). Owned feature implementation from design to deployment and mentored junior developers.

React React Native Next.js Expo TypeScript Jest Vitest

Junior Front-end Developer

WiiD – Work in Ideas

Dec 2021 - Jan 2024 (2 years 1 month)

Contributed to the development and maintenance of web and mobile products built with React, React Native, and TypeScript. Implemented unit tests with Jest to maintain code quality standards.

React React Native TypeScript Jest

Web Developer

Freelance

Dec 2020 - Dec 2021 (1 year)

Provided on-demand web development solutions for digital marketing agencies and clients. Developed and maintained applications using PHP, JavaScript, and CSS, and created conversion-optimized landing pages.

PHP JavaScript CSS HTML WordPress