Worked on the opentdf/java-sdk repository, focusing on enhancing encryption reliability and developer efficiency. Addressed a cryptographic bug by ensuring the NanoTDF encryption process correctly honored ByteBuffer array offsets during GCM encryption, which guarantees that only the intended data segments are encrypted. Developed a new Collections API that enables batch encryption and decryption of TDF files, allowing for configurable collection modes and support for custom decryption stores. These updates, implemented in Java and leveraging skills in API design and file handling, improved both security and throughput, while also providing clearer example classes to support developer adoption and integration.