Worked on reliability and compatibility improvements for JetBrains/koog and langchain4j, focusing on backend development with Java and Kotlin. Addressed serialization issues in OpenAI requests by implementing a serializer supporting both camelCase and snake_case, ensuring consistent API integration across multiple clients. Enhanced the Ollama client to robustly parse JSON from text/plain responses, updating content negotiation logic for better interoperability. Improved SQL query correctness in langchain4j by refining operator precedence handling, preventing unintended matches in PostgreSQL and MariaDB. Enabled stateless MCP deployments by exposing session ID management, supporting scalable architectures. Emphasized thorough unit testing and serialization best practices throughout the work.