Summary
Javier Castiarena is a seasoned technology leader and fractional CTO based in Buenos Aires with 15+ years shaping high-performing engineering teams in fast-growing environments. He partners with product, design, and business leaders to translate vision into scalable, secure, user-focused solutions, and thrives on building teams and processes that scale while delivering measurable impact. In his current roles at Mol Hats and Ontdek Buenos Aires, he leads AI-driven MVP development and orchestrates cost- and SEO- optimized migrations from complex cloud setups to low-code solutions, slashing operational expenses by up to 20x. His track record includes co-founding Fetcher, where he built engineering hubs in Colombia and Argentina and steered the move from a monolith to microservices, plus leadership at MercadoLibre delivering site-performance and targeted advertising improvements. He combines an engineering foundation with an Executive MBA, enabling him to bridge technology strategy with business outcomes across startups, consulting, and growth-stage companies. Based in Argentina, he brings hands-on experience across Java, Spring, Node.js, and cloud-native architectures with a proven knack for aligning engineering with strategic goals.
10 years of coding experience
13 years of employment as a software developer
Executive MBA, Business Administration and Management, General, Executive MBA, Business Administration and Management, General at Universidad Torcuato Di Tella
Engineer, Information Systems, Engineer, Information Systems at Universidad Tecnológica Nacional
English, Spanish, Dutch, Italian, Portuguese