Sebastian Fantini
Full Stack Engineer @Tallo
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WORK HISTORY
Full Stack Engineer @Tallo
Led the end-to-end migration of a large-scale production application from a client-side React SPA to a server-side rendered architecture using Remix.js and Express.js, significantly improving performance, SEO, and scalability. Architected and implemented the full AWS production infrastructure to support SSR, including Docker, CodeBuild CI/CD pipelines, Elastic Beanstalk, Application Load Balancer (ALB), CloudFront, ECR, and IAM, ensuring high availability and zero-downtime deployments. Drove frontend platform modernization by replacing Ant Design with a custom design system built on Radix UI, improving accessibility, reusability, and long-term maintainability across the application. Delivered measurable business impact by improving application performance by ~40% and increasing SEO effectiveness by ~50% on core user journeys. Partnered with backend, product, and infrastructure teams to redesign data-fetching and rendering strategies for SSR, aligning technical solutions with business goals. Mentored and guided junior engineers through code reviews, architectural discussions, and best practices, elevating team standards and technical maturity. Acted as a technical owner for critical systems, influencing architectural decisions, reducing technical debt, and improving overall platform reliability.
EDUCATION
Universidad de Palermo
Licenciatura, Administración/Administrador de sistemas, redes y comunicaciones LAN/WAN
ABOUT SEBASTIAN FANTINI
Full-stack Software Engineer with 7+ years of experience building scalable web applications using React and Node.js. Strong background in server-side rendering (SSR), performance optimization, and maintainable architectures. Experienced in delivering production-ready features across the stack while collaborating closely with product and design teams.
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