Juan Gabriel Espinoza

About Me

I'm a front-end developer with a passion for crafting user-friendly interfaces using modern technologies like React, JavaScript, TypeScript, and Next.js. I've contributed to key projects such as digital wallets and e-commerce platforms, focusing on optimizing performance and enhancing user experiences. I thrive in collaborative environments and am committed to continuous learning and problem-solving.

Contact Me

Work Experience

Frontend Developer

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.
  • Provided technical support and guidance to new team members, assisting them with environment setup and project workflow.

Software Developer for AI Training

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.

Software Developer Intern

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.

Get in Touch

I'd love to hear from you! Feel free to reach out with any questions or work opportunities.