Worked on the JetBrains/rd repository to address a critical concurrency issue in proxy generation. Focused on improving the stability of multithreaded environments by implementing a thread-safety lock within the ProxyGenerator component, which prevented infinite loops and potential crashes during concurrent builds. Refactored module builder access to ensure thread safety while maintaining existing functionality, directly enhancing reliability for production deployments. Utilized C# as the primary language, applying skills in multithreading, dynamic programming, and reflection to deliver a targeted bug fix. This work reduced crash risk and support overhead, contributing to more robust and maintainable concurrent build processes.