Worked on security hardening for the MervinPraison/PraisonAI repository, focusing on upgrading cryptographic practices and stabilizing the production environment. Replaced all MD5 hash usages with SHA-256 across 22 files, ensuring backward compatibility for legacy session IDs and repository paths. Disabled debug mode in production to mitigate information leakage risks, aligning the codebase with security best practices and addressing CWE-328 and CWE-489 concerns. Validated improvements using security tooling such as Semgrep, which confirmed a reduction in weak hash findings. Utilized Python programming and hashing algorithms to deliver a comprehensive, cross-file upgrade that improved the repository’s overall security posture.