During January 2025, Najdenov delivered comprehensive token management capabilities for the hiero-ledger/hiero-sdk-java repository, focusing on the Hiero SDK TCK. He implemented a full suite of token lifecycle operations, including fee schedule updates, freeze and unfreeze, association and disassociation, pause and unpause, KYC management, minting, and burning. Using Java and gRPC, he refactored parameter parsing and introduced new parameter and response classes to support these features, enhancing the reliability of token governance workflows. His work expanded test coverage and improved transaction management within the SDK, demonstrating depth in API design and a strong understanding of tokenomics principles.