Mobile developer
|React Native
Hey there!👋🏻
I'm Sebastian Mera
Web UI Architect focused on accessibility. Based in Colombia📍 Got a project in mind? I'm all ears — reach out anytime.
Hey there!👋🏻
Web UI Architect focused on accessibility. Based in Colombia📍Got a project in mind? I'm all ears — reach out anytime.
Overview 🔎
Frontend-focused Full-Stack Engineer with 5+ years of experience building high-traffic, enterprise-scale web platforms for global brands including Razorfish and Yum! Brands. Strong foundation in web fundamentals (HTML, CSS, JavaScript), with deep expertise in modern React ecosystems, performance optimization, and accessibility-first development.
Let's collaborate to bring your vision to life!
Let's collaborate to bring your vision to life!
Front-end developer
|React - Next.JS
Back-End developer
|Node.JS - Nest.JS
Work experience 👨🏻💻
SR Front-end Developer
Yum! Brands - KFC / TACO BELL / PIZZA HUT
- Built a shared frontend SDK powering both web and mobile commerce experiences for kfc.com and tacobell.com, cutting duplicated logic by ~35%.
- Delivered high-performance ordering flows for 10K+ daily users, reducing runtime errors by ~20%.
- Implemented GraphQL + Apollo Client with automated type generation and a JWT auth layer.
- Contributed to Node.js services handling API orchestration in a distributed system.
SR Front-end Developer
Razorfish - Publicis Groupe
- Led frontend development on Wegmans.com digital commerce platform using Next.js SSR, improving load performance by ~30% and boosting SEO.
- Built a reusable React component library with Storybook, accelerating delivery by ~25%.
- Managed complex checkout flows and global state with Zustand.
- Enforced accessibility (ARIA) standards throughout, reducing a11y issues by ~40%.
SSR Front-end Developer
FSB Technology (UK) Ltd - EveryMatrix
- Built React.js sportsbook and casino interfaces supporting real-time betting for thousands of concurrent users.
- Developed a WebSocket-powered live chat reducing response latency by ~35%.
- Achieved 90%+ test coverage with Jest, cutting production regressions by ~40%.
- Delivered projects for clients like fitzdares.ca, betgoodwin.co.uk, and casinotime.ca.
Jr Fullstack Developer
Autopartes APP
- Built an e-commerce platform for the automotive market using React.js, React Router, and Styled-components.
- Contributed to Node.js APIs and database integrations.
- Wrote unit tests to ensure platform stability.
- Gained a solid foundation in both frontend and backend development.