December 2025: Implemented Executorch On-Call Annotation for Signal Handling and Monitoring in pytorch/executorch, enhancing observability and reliability for production workloads. This feature adds an on-call annotation to improve signal handling and monitoring capabilities, enabling faster incident detection and response. The change was implemented as commit f26f22844cebeae2f17adcaadaa3a84075828257, with Differential Revision D87476364, and merged via PR https://github.com/pytorch/executorch/pull/16135. This delivers business value by strengthening on-call readiness and reducing mean time to detection/repair for frequent signals. Demonstrates strong tooling and collaboration through code review, instrumentation, and end-to-end delivery. Technologies/skills demonstrated include Python instrumentation, signal handling, observability practices, and PR-driven workflows.