Engineered by Jimmy Leonardo

JISMO (Japan International Science and Mathematics Olympiads) is an international academic competition for elementary school students, held across 10 countries including Japan, Indonesia, Singapore, Thailand, Malaysia, Vietnam, the Philippines, India, and Australia.
Architected and deployed JISMO's full-stack infrastructure as a freelance project in 2018, including the registration platform for parents and schools, the exam platform, and the scoring system. Designed the database schema, backend, CMS, and encrypted middleware to harden the platform against fraud and DDoS attacks, then published the accompanying mobile apps to Google Play and the App Store.
The original architecture still powers JISMO Olympiad across all 10 countries today.
Jimmy Leonardo
Senior Mobile Engineer & Full-Stack Developer
15+ years architecting and scaling production mobile applications and web systems across OTA, fintech, and enterprise domains.