PoSI (Proof-of-Skill Identity) is a full-stack platform that verifies real skills through live challenges, time-boxed tasks, and AI-assisted evaluation. It replaces traditional CVs and certificates with a trusted, immutable skill identity. Users earn verified “skill proofs” based on performance, difficulty, and behavior under pressure. The platform includes secure authentication, challenge engine, submission system, scoring logic, and a public shareable skill profile.