Christian Gati developed a feature for the apollographql/router repository that introduced per-stage coprocessor URL configuration, enhancing the flexibility and isolation of backend integrations. By enabling each processing stage—router, supergraph, execution, and subgraph—to specify its own coprocessor URL, Christian allowed teams to override global defaults and route requests to distinct coprocessor services as needed. This approach improved deployment safety and supported isolated environments for testing, staging, and production. The work leveraged Rust for backend development and focused on configuration management within API gateway contexts, demonstrating a thoughtful solution to complex deployment and integration challenges in distributed systems.