During November 2025, Darpan Kakadia developed a Manual Instrumentation Mode for the vercel/vercel repository, focusing on improving observability and tracing reliability in complex deployments. He introduced an environment variable-driven configuration that allows teams to disable automatic fetch instrumentation when manual instrumentation is preferred, reducing conflicts and double instrumentation risks. This feature was implemented across multiple packages, demonstrating cross-package coordination and a scalable approach to backend development. Working primarily with TypeScript and leveraging serverless architecture principles, Darpan’s work addressed the need for predictable tracing by enabling clear separation between automatic and manual instrumentation modes, enhancing flexibility for advanced API development workflows.