Worked on the Shopify/ruby repository to deliver Hybrid Public Key Encryption (HPKE) API support within the Ruby OpenSSL extension, focusing on secure message encryption and decryption using hybrid cryptographic techniques. The implementation involved C programming and Ruby development, with careful attention to cryptography standards such as RFC 9180. Developed comprehensive test coverage for DHKEM, validating encapsulation and decapsulation across both X25519 and NIST curves. Ensured compatibility with OpenSSL 3.5+ and support for non-FIPS builds, enhancing interoperability and reliability. No major user-facing bug fixes were recorded, as the work concentrated on strengthening security and test robustness for future development.