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Mateusz Czechowicz

@mateuszczechowicz

Message

I build React and TypeScript web applications, design systems, and reliable automated testing.

Poland

Message

I've spent eight years building React, TypeScript, and JavaScript web applications, with a focus on reusable UI systems and dependable product delivery.

At EcoVadis, I work with Product Designers to refine enterprise interfaces and co-develop a shared design system that improves visual consistency across applications.

I modernized legacy frontend areas, strengthened state-management patterns, and introduced a shared Cypress E2E solution that raised integration-test coverage from 0% to 70% while contributing to a 20% reduction in bugs.

I'm also co-building Savage Protocol, where I designed and released a React Native and Expo app for iOS and Android, delivering onboarding, authentication, localization, subscriptions, in-app purchases, and backend API integration.

Experience

Work history, roles, and key accomplishments

Current

Co-Founder and Mobile Engineer

Current

Savage Protocol

Dec 2025 - Present (9 months)

Designed and released a production iOS and Android app with React Native/Expo, managing architecture, implementation, and App Store/Google Play delivery. Built onboarding, authentication, localization, subscriptions, and in-app purchases.

React Native Expo Redux toolkit Redux RTK Query iOS Android app store Google Play In App Purchases Localization

Current

Front-End Engineer

Current

EcoVadis

Jan 2022 - Present (4 years 8 months)

Worked with Product Designers to build React/TypeScript interfaces, co-developed a design system, and introduced a shared Cypress E2E solution that increased test coverage from 0% to 70% and reduced bugs by 20%.