Worked on reliability improvements and new provider integration for feature flag management in the open-feature/flagd and open-feature/java-sdk-contrib repositories. Addressed error handling by implementing robust logic for missing or null default values in flag evaluation, ensuring that absent defaults return a FlagNotFound error and improving evaluation correctness. Developed the OFREP provider integration for the Java SDK, adding provider classes, API communication, and comprehensive unit tests. Enhanced the in-process resolver to handle missing or empty variants with clearer error messaging and expanded test coverage. Utilized Java, JSON processing, and API integration to strengthen backend workflows and enterprise feature flag capabilities.