Guillermo Rebolledo

Frontend-focused Software Engineer with 7+ years of experience building accessible, high-performance, and user-centered web applications. Expert in React, TypeScript, Design Systems, and UI architecture. Led major frontend initiatives, improved lighthouse performance to near 100, reduced bundle size by 86%, and drove accessibility compliance to WCAG AA. Passionate about crafting high-quality interfaces, scalable component libraries, and great user experiences.

Open to work

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Core Skills

Frontend

  • React
  • Typescript / Javascript
  • Tailwind CSS
  • HTML / CSS
  • Accessibility
  • Storybook
  • Design Systems
  • UI Architecture
  • Performance Optimization
  • Jest & React Testing Library

Backend

  • Node.js
  • Express
  • Python
  • PostgreSQL
  • MySQL
  • Redis
  • REST
  • GraphQL

UI / UX Engineering

  • Figma
  • Accessibility (WCAG AA)
  • AXE
  • Lighthouse
  • Storybook
  • Interaction Design
  • Design Systems
  • Usage Metrics

Testing & Quality

  • Jest
  • React Testing Library
  • Lighthouse
  • Accessibility testing
  • Sentry
  • Datadog
  • Web vitals

AI Assisted Development

  • Claude Code
  • Cursor
  • GitHub Copilot (code reviews)
  • LLM powered debugging & test generation

Tools & Platforms

  • Git
  • Github Actions
  • Docker
  • React Profiler
  • Datadog
  • Mixpanel

Additional Skills

  • React Native
  • Swift (basic to intermediate)
  • Observability

Experience

Cerby

Software Engineer • Sep 2021 - Present

At Cerby, I led key frontend initiatives across the web app, browser extension, and mobile applications, focused on making them faster, more reliable, and genuinely enjoyable to use. I pushed accessibility to WCAG AA standards, introduced user metrics with Datadog and Mixpanel to guide smarter product decisions, and drove major performance wins, including an 86% reduction in bundle size and near-perfect Lighthouse scores. One of my favorite projects was leading the frontend for Cerby’s password-manager migration tool—from research to architecture to delivery—which played a part in landing one of the company’s largest customers. I also built core features across the platform, contributed heavily to our design system, and helped shape frontend best practices across the engineering org.

  • React
  • Typescript
  • Tailwind CSS
  • Python
  • REST
  • Jest
  • React Testing Library
  • Lighthouse
  • Accessibility (WCAG AA)
  • Sentry
  • Datadog
  • Web vitals
  • Design Systems

Wizeline

Software Engineer • July 2018 - Sep 2021

I had the chance to build products used around the world—from helping Google improve mobile onboarding experiences to shipping payment flows through the Stripe partnership. I developed tools for teams like the Golden State Warriors, improving the Chase Center’s suite rental platform with faster SSR and a smoother mobile experience, and contributed to the Wall Street Journal’s newsletter platform used by over 3 million readers. I also worked with Subterra.ai, cutting costs and boosting performance by rethinking how video was processed and delivered. I led a team to build internal tools—including a Slack-integrated employee recognition system and a mobile-first office map with custom animations—that streamlined how employees connected and navigated the workplace.

  • React
  • Typescript
  • HTML / CSS
  • Python
  • Jest
  • React Testing Library
  • GraphQL
  • Web vitals
  • Design Systems

Universidad de Guanajuato

Software Engineer • July 2017 - July 2018

Built a job placement platform used by hundreds of graduating students & partner companies.

  • jQuery
  • HTML / CSS
  • C#
  • SQL Server

Thanks for stopping by!

I'm always looking for new opportunities to grow and learn. If you have any questions or would like to connect, please feel free to reach out.

More about me: I love music 🎸, photography 📸, travel 🌍 and video games 🎮.