Juan Sebastián Zapata Front-end developer

Platform Engineer

RebelMouse

Dec 2023 - Jul 2025 (1 year 8 months)

Worked on a large-scale content platform serving millions of pageviews, focusing on performance, SEO, and Core Web Vitals optimization across complex, CMS-driven front ends. Designed and maintained resilient JavaScript architectures to handle highly dynamic DOMs, third-party injections, and frequent layout mutations without degrading UX or metrics. Led performance-critical initiatives including LCP optimization, render-blocking reduction, lazy loading strategies, and scripting cost control. Implemented advanced DOM observation patterns (MutationObserver, IntersectionObserver) to safely coordinate dynamic content loading, ad tech, analytics, and user interactions while preserving stability and crawlability. Collaborated closely with SE

Adjunct Professor - Web Programming

Universidad Icesi

Jul 2023 - Jul 2024 (1 year 1 month)

Created a React course from scratch and instructed advanced React architecture and Firebase integration for college students.

Front-end developer & Webmaster

Colegio Bolívar

Jul 2019 - Aug 2022 (3 years 2 months)

Led the complete overhaul of a legacy hard-coded infrastructure to a high-performance custom WordPress architecture, eliminating security vulnerabilities and code sprawl. Engineered a custom UI/UX redesign focused on speed and modularity, resulting in a 50% improvement in maintenance scalability and content update efficiency. Empowered non-technical staff by implementing a scalable CMS workflow, reducing the dependency on engineering for content updates and streamlining the deployment pipeline. Audited and patched the institutional portal's architecture, ensuring a robust and secure frontend environment for the school's digital presence.

Front-end Developer & Digital Resources Professor

Universidad Autónoma de Occidente

Oct 2013 - Dec 2017 (4 years 3 months)

Engineered interactive web interfaces and digital pedagogical tools using JS (jQuery), Bootstrap, and CSS3, focused on UX for learning environments. Developed and customized a web-based digital repository using DSpace (JSPUI), optimizing the delivery and indexing of academic assets. Instructed courses on Design Fundamentals and ICT-supported communications, bridging the gap between interface design and effective digital delivery.

Monitor académico

Universidad Icesi

Jan 2009 - Nov 2012 (3 years 11 months)

- Monitoría académica de cursos Fundamentos de programación y Diseñando con Algoritmos: Oportunidad dada por ICESI a los estudiantes destacados en dichas materias. - Acompañamiento a los estudiantes durante el curso en un espacio especifico, donde resolvía sus dudas y dificultades con respecto al curso.

Monitor de salas de computoAsistencia técnica a los profesores en las salas de computo de la Universidad ICESI. Preparac

Universidad Icesi

Jan 2009 - Nov 2011 (2 years 11 months)

- Asistencia técnica a los profesores en las salas de computo de la Universidad ICESI. Preparación técnica de las salas de computo antes de las clases ( computador maestro, videoBeam, cableado y funcionamiento).

Juan Sebastián Zapata

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