During April 2026, this developer delivered European region support for Vertex AI within the anthropic-sdk-go repository, enabling EU-based enterprise adoption and compliance with data residency requirements. The work involved introducing a dedicated EU base URL and updating the SDK’s configuration to support region-specific deployments, ensuring lower latency for European users. They expanded and refined the test suite to validate EU-region flows, demonstrating a test-driven approach and readiness for future multi-region expansion. The implementation leveraged Go for backend development, REST/HTTP integration, and robust testing practices, resulting in a codebase prepared for broader regional support and smoother onboarding for enterprise customers.