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.jsTypeScriptNode.jsNest.jsExpress.jsGraphQLStorybookDockerTailwind CSSSassRedux

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.

Software Developer

Fides ConsultingReply / Mediaset Infinity
Milan, Italy
Jan 2025 – Present
  • I ensure millions of users across Europe can enjoy their favorite streaming content through a fast and stable platform.
  • Led a major technical modernization that made the application 35% faster, directly improving how long users stay engaged with the content.
  • Enhanced how search engines find our catalog, resulting in a 25% increase in organic traffic and making the platform more discoverable.
  • Established high-quality development standards and automated workflows to ensure every new feature is reliable and error-free.
  • Advocated for and implemented international accessibility standards, making the service inclusive for every subscriber, regardless of their abilities.

Full Stack Engineer

AvvaleENI
Milan, Italy
Jun 2022 – Jan 2025
  • Transformed complex operations in the energy sector into simple, real-time digital tools for technical teams.
  • Built a monitoring system that empowers operators to respond to service issues 40% faster, ensuring better reliability for the end-user.
  • Digitized critical HR and legal workflows, replacing slow, paper-based processes with secure, instant digital signature solutions.
  • Designed and developed internal interfaces that make daily tasks like time-tracking and resource management intuitive for hundreds of employees.

Software Developer

SOJACA EIRL
Santo Domingo, Dominican Republic
Aug 2020 – Dec 2020
  • Partnered with local businesses to bring their ideas to life, managing everything from the first concept to the final launch.
  • Crafted responsive and modern web interfaces that provide a seamless experience on both mobile devices and desktops.
  • Engineered secure systems to handle data flow, ensuring that the underlying technology is as robust as the visual design.

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.