Guillermo Paz

Principal Engineer @ Mercado Libre

About

Hello! 👋 I'm a frontend developer with a creative vision and a great passion for technology. I love and keep close track of frontend trends, web standards, web performance, and digital accessibility. Currently, I work as Principal Engineer at Mercado Libre, where I'm part of the team building the frontend platform used company-wide to create applications with React and Node.js. Responsibilities: I lead the Frontend Web Platform team. I continue to spend part of my time coding. I coordinate the implementation of significant frontend core features. I review of merge requests made by frontend engineers. I help to defines best practices and coding standards for frontend group. I ensure that the technical decisions and process are followed. I participate in architecture discussions guiding our use of web technologies. I help to scale the team, tooling and workflows. I interview candidates for frontend engineers positions. I help engineers to actively develop their skills. Specialties: Expert level knowledge of the JavaScript language. Experience at developing JavaScript libraries. Experience at writing Node.js modules and packages. Expert understanding of web technologies. Expert level knowledge of HTML y CSS. Experience with site-speed improvements. Experience at working with graceful degradation y progressive enhancement. Experience with GIT. Experience with the latest and greatest web standards.

Country

City

Argentina

Industry

Computer Software

Skill

CSS3, HTML, CSS, JavaScript, jQuery, PHP, SQL, Git, Jade, Pair Programming, JSON, Web Standards, Front-end Development, Design Patterns, Web Development, Object Oriented Design, JavaScript Libraries, JavaScript Frameworks, Web Applications, Cross-browser Compatibility

Experience

Principal Engineer

Mercado Libre

2023-3 - Present · 3 yrs 7 mos

Buenos Aires, Argentina

I work as Principal Engineer at Mercado Libre (Individual Contributor), where I'm part of the team building the frontend platform used company-wide to create web applications (React / Node.js) and native applications (Jetpack Compose / SwiftUI). I’ve been a key driver in bringing AI to the organization. A journey that required unlearning and learning again. Currently 100% focused on AI-native development, I leverage Specs, MCPs, Skills and emerging "standards" to bridge LLMs with our internal tools and libraries. My work defines the strategy for LLM-powered interfaces, focusing on seamless AI-driven interactions and automated frontend delivery.

Frontend Senior Expert

Mercado Libre

2020-3 - 2023-3 · 3 yrs 1 mo

Buenos Aires, Argentina

I'm a Frontend Senior Technical Manager leading the Frontend Web Platform Team. I’m currently leading the team who builds the Mercado Libre's platform for building universal applications with React and Node.js. So, I work closely with our frontend engineers and UI designers to make sure our web applications are built consistently across the whole company.

Frontend Expert

Mercado Libre

2018-1 - 2020-3 · 2 yrs 3 mos

Buenos Aires, Argentina

I'm a Frontend Technical Manager working on the Frontend Platform Team. I work building the Mercado Libre's platform for building universal React / Node.js applications. So, I work closely with our frontend engineers and UI designers to make sure our web applications are built consistently across all teams. Also, I maintain all of our collaborative front end UI Components, UI Libraries, Widgets and Node.js modules.

Frontend Tech Lead

Mercado Libre

2016-2 - 2017-12 · 1 yr 11 mos

Buenos Aires, Argentina

I'm a Frontend Technical Lead working on the Frontend Architecture Department. I build the Mercado Libre's platform for building universal React / Node.js applications. So, I work closely with our frontend engineers and UI designers to make sure our web applications are built consistently across all teams. Also, I maintain all of our collaborative front end UI Components, UI Libraries, Widgets and Node.js modules.

Senior Frontend Developer

Mango Payments Inc.

2014-3 - 2016-2 · 2 yrs

Buenos Aires, Argentina

Frontend Developer

Mercado Libre

2008-11 - 2014-2 · 5 yrs 4 mos

Buenos Aires, Argentina

I was a Frontend Developer at Mercado Libre. I built Chico UI (MercadoLibre's UI framework). I reviewed the front end code. Also, I researched the best practices and teach it to others frontend teams to improve their code. I gave speeches about web standards, best practices and how do you improve your front end code (patterns, design, performance, etc).