Paul Hong developed the MCP JSON REST Bridge feature for the envoyproxy/envoy repository, focusing on seamless integration between MCP JSON-RPC and standard JSON-REST HTTP requests. He engineered a new filter in C++ that translates MCP requests, allowing existing REST backends to operate as MCP servers without requiring native MCP support. The solution leveraged Protocol Buffers for efficient data serialization and included deployment-time configurability through a new filter configuration option. By enabling incremental MCP adoption and reducing migration friction, Paul’s work addressed enterprise reliability needs and preserved REST-based investments, demonstrating depth in API development and protocol translation within a short timeframe.