Carlos Mateus

Software Developer

Upwork • Freelance

Dec 2021 - Present • 4 yrs 8 mos

End-to-end product work plus browser bots and automation: clients who need clear interfaces, solid backends, and systems that survive real-world detection. - Built Selenium and browser bots for account flows, scraping, and repetitive workflows across Chrome and Edge. - Worked around Cloudflare and related bot-detection layers with stealth and resilient automation patterns. - Designed backend architectures with Node.js and Python (Django) for performance and scale. - Prototyped interfaces in Adobe XD and Figma aligned with client goals. - Shipped cross-platform apps with React Native and Expo alongside design and product teams. 06 Integrated REST APIs and data layers with Node.js, Python, Supabase, and Firebase. - Covered reliability with unit and integration tests using Jest and React Testing Library. I also care about UI/UX: interfaces that feel clear and elevate the finished product beyond the brief.

Software Developer

ADJ Pro • Part time

Aug 2023 - Feb 2024 • 6 mos

ADJ Pro is a dynamic startup specializing in website creation, mobile app development, and innovative digital marketing strategies. At ADJ Pro, I played a key role in designing and developing cutting-edge solutions that empowered businesses to enhance their digital presence and streamline operations. - Developed RESTful APIs and mobile app features using React Native, delivering scalable and robust solutions tailored to client needs. - Built dynamic and responsive websites and platforms using modern frameworks like ReactJS, NextJS, and TypeScript, ensuring optimal user experiences. - Led the creation of a comprehensive e-commerce platform, incorporating functionalities such as order management, advertising campaign creation, and automated invoicing, driving efficiency and client satisfaction. - Enhanced data management and user authentication processes by integrating Supabase and Firebase, ensuring secure and efficient applications. - Maintained high-quality code through rigorous testing, utilizing Jest (TypeScript, JavaScript) and Pytest (Python) for unit and integration tests.