Juan Gabriel Espinoza - Frontend Developer

Work Experience

Globant | Nov. 2024 - Present, Buenos Aires, Argentina

Developed and maintained React and Next.js features for the 2026 World Cup football platform, including the creation of team management views, match control, fixture handling, live match monitoring, and API integrations using React Query, with unit tests in Jest and accessibility tests in Axe DevTools.
Led the migration of an entire design system from SASS to Chakra UI, including TanStack Table integration, along with the project’s overall architecture, Next.js setup, Storybook configuration, and the migration of design tokens, colors, and core UI foundations.
Responsible for the creation and maintenance of a landing page for the Asian Cup of football website, built from scratch with Next.js, Tailwind CSS, Sitecore CMS, and multilingual support.
Led the initial development and project structure for a football website built from scratch with React, Next.js, and TypeScript, then continued developing and maintaining React components for several customer-focused views, including authentication flows such as login, registration, password reset, and OTP verification, as well as favorite team selection, seat-based ticket purchasing, several API integrations, Sitecore as a content management system, and Redux for global state management.

Valtech | Dec. 2021 - Nov. 2024, Buenos Aires, Argentina

Contributed to the back-office development of a wallet from Panama, implementing key features such as user management, virtual card tracking, and secure login/logout systems using React, Next.js, and TypeScript.
Engaged in the development of a leading telecommunications and media company in Mexico, focusing on satellite TV, mobile plans, and internet services. Utilized React, Next.js, TypeScript, MaterialUI, XState, and NX within a large-scale mono repo architecture to create and maintain shared components across web and mobile applications.
Developed and maintained frontend components for a leading provider of RF and microwave components. Worked with Adobe AEM, JavaScript, and jQuery to improve the checkout pay flow, fix existing components, and implement content changes. Reached the MVP stage with the project, leading to a 40% increase in traffic. Provided demos to showcase the fixes and improvements, ensuring the client’s requirements were met effectively.

Scale | May 2023 - October 2023, Remote, Argentina

Reviewed and corrected code written in JavaScript, React, HTML5, and Python, utilizing libraries such as Matplotlib, Pandas, and PyTorch. Focused on algorithms and data structures, particularly in the context of training LLMs through human reinforcement learning.
Collaborated closely with other team members to ensure code quality and consistency across projects. Assisted in onboarding new team members and participated in war rooms to troubleshoot and resolve critical issues during project rollouts.

Rodamientos Misiones Sociedad Anónima | June 2021 - August 2021, Misiones, Argentina

Used HTML, CSS, and JavaScript to develop and redesign an attractive, interactive, and intuitive company website
Created and optimized a customer-focused website with 95% customer satisfaction and an average 5% increase in sales due to improved functionality and reduced page load times.
Incorporated responsive web design techniques to ensure the optimization of the company's website for viewing on mobile and desktop devices.
Developed and tested the company's website to ensure a high level of accessibility, scalability, and browser compatibility.