- Led full-stack development of Jock7, a national lottery platform for Promosport (Ministry of Youth and Sports), handling QR-based game participation, OTP authentication, and monthly prize draws for thousands of users. - Built dual React.js dashboards — client-facing for profile and lottery history management, admin-facing for user management, analytics, and draw administration. - Integrated a Python-based offline RNG desktop application ensuring cryptographically secure and fully auditable winner selection process.