Javier Castiarena
Fractional CTO at Ontdek Buenos Aires
Buenos Aires, Autonomous City of Buenos Aires, Argentina
Summary
👤
Senior🎓
Top SchoolJavier 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 TellaEngineer, Information Systems, Engineer, Information Systems at Universidad Tecnológica Nacional
English, Spanish, Dutch, Italian, Portuguese
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (5)
django4
seo3
metadata3
python3
search-engine3
Programming languages (2)
Github contributions (5)
jcastiarena/sls-notification-service
Oct 2023 - Mar 2025
Contributions:1 review, 4 PRs, 12 pushes in 1 year 5 months
jcastiarena/sls-auction-service
Oct 2023 - Jun 2024
Contributions:1 review, 2 PRs, 4 pushes in 8 months
Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.