Masato James focused on backend security and resilience in Go-based blockchain infrastructure over a two-month period. In the erigon repository, he extended RPC batch size protection to WebSocket and IPC transports, enforcing limits, logging violations, and implementing safe shutdowns to prevent abuse and resource exhaustion. He wrote automated tests to validate WebSocket behavior under these constraints. In ethereum/go-ethereum, Masato introduced GraphQL query depth limiting to mitigate denial-of-service risks, setting a maximum depth and verifying enforcement with end-to-end tests. His work demonstrated depth in API security, backend development, and network security, addressing abuse vectors through robust, test-driven engineering solutions.