Skip to content
View guillermo-rebolledo's full-sized avatar
:octocat:
:octocat:

Highlights

  • Pro

Block or report guillermo-rebolledo

Block user

Prevent this user from interacting with your repositories and sending you notifications. Learn more about blocking users.

You must be logged in to block users.

Maximum 250 characters. Please don’t include any personal information such as legal names or email addresses. Markdown is supported. This note will only be visible to you.
Report abuse

Contact GitHub support about this user’s behavior. Learn more about reporting abuse.

Report abuse

Hi, I’m Guillermo Ortiz Rebolledo 👋

Senior Frontend Engineer focused on building accessible, high-performance web experiences with React + TypeScript.

I care a lot about:

  • Accessibility (WCAG-driven UI work)
  • Design systems and reusable component architecture
  • Performance (Lighthouse / Web Vitals mindset)
  • Product quality through testing, observability, and data-informed improvements

🚢 Side Projects Shipped

PerfLabs - A production-ready web performance monitoring application built with Next.js 15, featuring automated PageSpeed Insights audits, scheduled monitoring, and comprehensive performance analytics.

app link badge app repo badge

Marathon - An Electron app for running JavaScript and TypeScript snippets locally

app repo badge

ArcDB - Wiki-style site that helps Arc Raiders players have the perfect companion for the game. Used by hundreds of users weekly.

app link badge app repo badge

Personal Site

app link badge app repo badge


🧰 Tech I work with

Frontend

React Badge HTML5 Badge CSS Badge TypeScript Badge JavaScript Badge Next.js Badge Tailwind CSS Badge Storybook Badge TanStack Badge Astro Badge

Quality & Testing

Jest Badge Vitest Badge Testing Library Badge

Analytics & Observability

Mixpanel Badge Datadog Badge Sentry Badge

Backend & Cloud

Node.js Badge Python Badge PostgreSQL Badge GraphQL Badge GitHub Actions Badge Docker Badge

Tools

Webpack Badge Vite Badge

🚀 A few things I’ve worked on

  • Improved accessibility across core product onboarding flows, helping remove adoption blockers for enterprise customers
  • Raised Lighthouse scores on key flows through profiling and UI performance optimization
  • Led frontend delivery of a password manager migration tool (LastPass → 1Password / Dashlane expansion)
  • Evolved a shared design system used across Web, Extension, and Mobile
  • Added unit/integration coverage across key flows and supported QA automation for end-to-end tests

These are the kinds of problems I love: scaling UI quality, improving confidence in releases, and making products feel great to use.


💼 Work Experience

Cerby — Senior Frontend Engineer

Sep 2021 – Nov 2025

Worked on accessibility, performance, product instrumentation, design systems, and testing across enterprise-facing web experiences. Led a 4-person frontend effort to ship a migration tool and helped improve release confidence with stronger test coverage.

Wizeline — Software Engineer

Jul 2018 – Sep 2021

Built and maintained products for clients including Dow Jones / Wall Street Journal and Golden State Warriors / Chase Center, and led a Slack-integrated internal product used in onboarding and company culture workflows.


🌱 What I’m into right now

  • Frontend architecture for complex products
  • DX and tools to improve coding experiences and products
  • Accessibility-first UI patterns
  • Design systems and shared component APIs
  • Performance optimization and real-user metrics
  • Full-stack projects to keep sharpening backend skills

📫 Let’s connect


⚡ Fun fact

I’m a frontend engineer who loves the intersection of product polish + engineering quality — the sweet spot where good UX, performance, and maintainable systems all meet.

Pinned Loading

  1. arc-raiders-db arc-raiders-db Public

    TypeScript

  2. brut brut Public

    Astro

  3. web-perf web-perf Public

    TypeScript

  4. music-memo music-memo Public

    TypeScript

  5. marathon marathon Public

    JavaScript