Hey there!πŸ‘‹πŸ»
I'm Sebastian Mera

Web UI Architect focused on accessibility. Based in ColombiaπŸ“
Got a project in mind? I'm all ears β€” reach out anytime.
My picture
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Overview πŸ”Ž

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!
React Native

Mobile developer

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React Native

React - Next.JS

Front-end developer

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React - Next.JS

Node.JS - Nest.JS

Back-End developer

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Node.JS - Nest.JS

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Work experience πŸ‘¨πŸ»β€πŸ’»

Yum! Brands - KFC / TACO BELL / PIZZA HUT

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.
Present
Razorfish - Publicis Groupe

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%.
FSB Technology (UK) Ltd - EveryMatrix

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.
Autopartes APP

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.
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Tech Stack πŸ’»

Reach Out and let’s talk! πŸ‘‹πŸ»