Worked on enhancing interoperability and robustness within the ethereum/go-ethereum repository by addressing a specific issue in the Ethclient RPC filter. Focused on backend development using Go, the contribution involved modifying the RPC filter logic to omit empty address and topic fields from requests, thereby improving compatibility with non-Geth Ethereum nodes. This change prevented non-Geth environments from rejecting requests containing empty address arrays. The update also included expanding the test suite to cover scenarios with empty address slices, ensuring consistent behavior across different node implementations. The work demonstrated attention to cross-client compatibility, JSON serialization, and reliable RPC communication in distributed systems.