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Resume · 2026

Ethan A. Mercado

Lead Front-End Developer · UI Engineer

I build scalable digital products where thoughtful engineering, clear UX, and refined visual craft work as one.

ethan.a.mm98@gmail.com(804) 484-5620

Metro Area, Puerto Rico

Professional Experience

Synergy LLC

Lead Front-End React Developer

March 2024 - Present

Hato Rey, San Juan, PR · Hybrid

  • Lead front-end development with React, Next.js, and TypeScript for scalable, high-performance web applications.
  • Architect new applications from the ground up while modernizing established client products.
  • Build responsive landing pages, CMS platforms, and internal administration tools with Tailwind CSS.
  • Implement real-time experiences and live data synchronization with SignalR.
  • Create rich-text workflows, data dashboards, visualizations, and advanced scheduling experiences.
  • Improve performance through code splitting, lazy loading, and scalable state-management patterns.
  • Maintain reusable component libraries and design systems across multiple products.

TECKpert LLC

Lead Front-End Developer · Internal Platforms

TECKpert LLC

September 2021 - July 2023

Miami, FL · Remote

  • Led front-end delivery for web and mobile applications supporting a technology freelancing platform.
  • Rebuilt legacy experiences with React and React Native to improve scalability, maintainability, and efficiency.
  • Owned delivery from requirements and system design through implementation and deployment.
  • Designed resolution-management tools and reusable interfaces connected to GraphQL and AWS services.
  • Contributed to Longbow, a React-based financial investment analysis platform.
  • Improved reliability and UX through focused debugging, optimization, and cross-functional collaboration.
References available upon request.