Hi, I'm Guillermo 👋

Freelance (Remote)

• · Managed end-to-end project delivery for international clients, using asynchronous communication to ensure alignment across multiple time zones.
• · Drove a 12% increase in conversion rate by re-engineering the front-end with new React/Next.js components, improving overall page load speed by over 30% through image optimization and lazy loading.
• · Implemented a quality-first development lifecycle by architecting a comprehensive testing strategy with Vitest and React Testing Library. This reduced critical production bugs by 60% and increased code coverage to 90%, cutting manual testing time by 50%.

Stack: React, Next.js, TypeScript, Vitest, React Testing Library, JavaScript

Santiago, Chile (Remote)

• · Architected and delivered the company's first internal operations platform using React, Next.js, and TailwindCSS, launching the MVP in under 2 months.
• · Accelerated deployment time by 54% by migrating the entire CI/CD process from AWS pipelines to GitHub Actions, reducing the average build times from 15 to 7 minutes.
• · Architected and shipped critical platform services for MACH Business B2B website, including a role-based access control (RBAC) system and a dynamic QR generation API to enable new commercial features.
• · Enhanced developer efficiency by creating a reusable component library with 45+ components, standardizing design patterns across the team, and accelerating feature development.
• · Drove a more predictable development cycle, achieving a consistent 87% sprint completion rate by identifying and resolving technical bottlenecks, which streamlined team workflows and minimized carryover.

Stack: React, NextJS, TypeScript, Tailwind CSS, Vitest, Shadcn UI, AWS, Firebase, Git.

Online

• · JavaScript, TypeScript, React, NextJS, NodeJS, Git, Modern Web Practices, etc.

Duoc UC, Santiago, Chile

• · Completed Bachelor of Computer Science Engineering program.

CertiProf International

• · Validated foundational knowledge in Scrum principles and practices.

CertiProf International

• · Committed to continuous professional development and learning.

SCRUMstudy

• · Certified understanding of Scrum framework fundamentals.

6sigmastudy

• · Certified in Six Sigma methodologies for process improvement.

ETS

• · International Advanced English Certificate, demonstrating proficiency in English communication for professional environments.