Andres focused on backend development for the block/goose repository, where he implemented a secure, token-based authentication pathway for AWS services using Rust and the AWS SDK. His primary contribution was adding support for the AWS_BEARER_TOKEN_BEDROCK environment variable, enabling bearer token authentication for Bedrock and related AWS services. This work involved integrating environment variable management, region validation, and configuration adjustments to ensure safe deployment across AWS regions. Andres also developed and executed tests to verify the new authentication flow and prevent regressions. The project demonstrated a depth of understanding in secure backend integration and environment-driven configuration management.