Worked on enhancing the Transaction Block RPC API within the MystenLabs/sui repository, focusing on improving transaction data accessibility and developer usability. The engineering effort centered on making response options optional, reducing the complexity for API consumers, and enriching transaction block responses with checkpoint numbers and timestamps aggregated from multiple data sources. Leveraging skills in API design, backend development, and data indexing, the work utilized Rust and Move to deliver more comprehensive analytics capabilities and facilitate auditing. These changes improved data fidelity and streamlined the developer experience, reflecting a thoughtful approach to backend API evolution and cross-source data integration.