Worked on the erigon repository to enhance the DataColumnSidecar API, focusing on aligning its behavior with beacon API specifications and improving event streaming capabilities. Used Go to update REST endpoints and SSE event payloads, ensuring that fields such as index, block_root, and slot matched official swagger paths and provided better event correlation. Addressed integration requirements for Caplin by resolving a DataColumnSidecar issue, achieving parity with Lighthouse and Nimbus event handling. Applied backend development and data structures expertise to deliver consistent REST and SSE responses, reducing client integration challenges and improving reliability for downstream services that depend on cross-project API consistency.