Worked on enhancing customization for AWS Config rules in the awslabs/landing-zone-accelerator-on-aws repository by introducing a new TypeScript interface model for defining Lambda-based custom rules. Refactored the existing ConfigRule implementation to support cases where customRule can be undefined, allowing for more flexible and maintainable rule definitions. Updated documentation using typedoc to improve type safety and developer experience, ensuring that the new CustomRule interface was clearly described. Focused on infrastructure as code practices with AWS and TypeScript, the work addressed the need for optional rule configurations and improved the clarity and traceability of changes through targeted documentation and commits.