Sebastian
Guzman

Software Developer
I build web experiences that feel effortless and perform flawlessly at scale. I bridge the gap between complex engineering and the people who use it every day, ensuring that every click is fast, accessible, and meaningful.
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About Me

Engineering with a focus on people and performance

Creating digital tools that empower users at scale

I believe technology should serve people, not the other way around. My journey as an engineer is driven by a simple goal: making the web faster, more inclusive, and genuinely helpful. With over 4 years of experience, I've specialized in the React ecosystem to turn complex problems into intuitive digital solutions.Having built platforms that reach millions of users in the Media and Energy sectors, I've seen firsthand how a few milliseconds of performance or a thoughtful accessibility fix can change someone's day. I don't just write code; I build robust foundations that help businesses grow and teams thrive.
ReactNext.jsJavaScriptAngularPythonDartFlutterTypeScriptNode.jsNest.jsExpress.jsGitCSSHTMLGraphQLStorybookDockerTailwind CSSSassReduxZustandMicrofrontendsMicroservicesJestMongoDBPostgreSQL

Scalable Foundations

I write clean, organized code that is easy to maintain, allowing products to grow without technical friction.

Speed & Visibility

I optimize for people. By making sites 35% faster and more visible, I ensure users find what they need instantly.

Team-First Mindset

Great products are built by great teams. I champion Agile values and clear communication to reach shared goals.

Future-Proofing

I stay ahead of the curve, adopting modern tools like Next.js 15 to keep digital experiences fresh and reliable.

Featured Projects

A collection of digital solutions where architecture meets purpose. From streaming platforms for millions to mission-critical tools, these projects reflect my commitment to performance and user-centric design.
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Professional Experience

A journey of building scalable web ecosystems. My career is defined by leading technical modernizations and delivering measurable impact across the Media and Energy sectors.

Frontend Developer

Fides ConsultingReply / Mediaset Infinity
Milan, Italy
Jan 2025 – Jan 2026
  • Worked within the core team responsible for Mediaset Infinity, a leading OTT streaming platform for the Italian and Spanish markets.
  • Contributed to the modernization of the frontend architecture using Next.js 15 (App Router), helping improve scalability and maintainability.
  • Implemented dynamic metadata management and structured data (JSON-LD) to strengthen technical SEO and content discoverability.
  • Supported code quality improvements through CI workflows, code review practices, and frontend standards.
  • Identified and addressed accessibility issues to improve WCAG compliance across key user flows.
  • Technical Environment: Next.js 15, React, TypeScript, GraphQL, Jest, Storybook, Tailwind CSS.

Full Stack Developer

AvvaleENI
Milan, Italy
Jun 2022 – Jan 2025
  • Contributed to digital transformation projects in the Energy and HR domains.
  • Built a real-time monitoring dashboard using React and Node.js to support operational visibility and service health tracking.
  • Developed an internal platform for digital signatures, helping streamline HR workflows and reduce manual paperwork.
  • Designed user-friendly interfaces for timesheet and resource management applications.
  • Technical Environment: Angular, Python, React.js, Node.js, Redux, Fluent UI, Express.js, Agile/Scrum.

Full Stack Developer

SOJACA EIRL
Santo Domingo, Dominican Republic
Aug 2020 – Dec 2020
  • Developed custom web solutions for local businesses, covering both frontend and backend implementation.
  • Built responsive user interfaces with React and TypeScript.
  • Developed and maintained REST APIs with Node.js to support application features and data flows.
  • Technical Environment: React, TypeScript, Redux Toolkit, Node.js, REST APIs.

Let's Connect

I'm always open to discussing new challenges, technical leadership, or how we can build a faster, more inclusive web together. Let's start a conversation.

Let's start a conversation

Whether you have a specific project in mind, a technical challenge, or just want to talk shop, I'm all ears.