Worked on enhancing the stability of the PT2 compile path in the graphcore/pytorch-fork repository by addressing a critical issue with pending callbacks. Applied backend development and error handling skills in Python to increment the pending_callbacks_counter before initiating PT2 compile callbacks, which prevented assertion errors when exceptions occurred within callbacks. This adjustment ensured that the callback mechanism remained robust even in exception-heavy scenarios, reducing the likelihood of flaky builds. The fix improved the reliability and determinism of continuous integration processes, contributing to more predictable build outcomes and a smoother development workflow for teams relying on the PT2 compilation process.