Over a two-month period, contributed to the anthropics/financial-services and anthropics/anthropic-sdk-typescript repositories by building and refining backend features focused on secure gateway integration, financial data parsing, and robust streaming. Leveraged TypeScript and Python to implement manifest-driven configuration, enhance error handling, and standardize API formats, ensuring accurate data processing and flexible authentication. Improved documentation to align with evolving code, supporting clear cross-team communication. Addressed edge cases in multiplier normalization for financial parsing and expanded validation for configuration keys. Enhanced streaming SDK reliability by introducing structured error handling and comprehensive tests, demonstrating a methodical approach to maintainability, security, and developer experience.