Worked across five repositories to enhance code quality, security, and maintainability using Go, Python, and TypeScript. Improved readability and reduced maintenance friction in a2aproject/a2a-samples, google/A2A, and safedep/vet by correcting typos and standardizing naming conventions without altering functionality. In BerriAI/litellm, addressed a cost calculation bug for the Gemini model and strengthened API security by parameterizing SQL queries and improving input validation, supported by new tests. Enhanced onboarding and developer experience in Shubhamsaboo/adk-python through documentation cleanup and typo corrections. Focused on backend development, code refactoring, and SQL injection prevention to support safer, more maintainable deployments.