Worked on the aws-toolkit-jetbrains and aws-toolkit-vscode repositories to deliver AWS Toolkit 4.0 release readiness, focusing on backend development and plugin compatibility. Enhanced the CloudFormation Language Server and improved Node.js resolution to support evolving infrastructure needs, while introducing an in-app notification system for AWS Core plugin deprecation. Added IntelliJ IDEA 2026.1 support by updating build targets and run configurations, ensuring cross-IDE compatibility. Addressed Qodana linter compatibility with JDK 25 to maintain CI/CD reliability. Improved error handling in the VS Code extension’s detached server startup using Java, Kotlin, and Python, emphasizing robust asynchronous programming and configuration management practices.