Developed rollout log analysis tooling for the openai/codex repository, focusing on backend development, data validation, and schema design using Rust and JSON. The work centered on introducing an internal JSON schema for RolloutLine, which enabled automated parser and validator generation for rollout logs. By resolving writer-reader schema mismatches, the developer ensured consistent data handling across the rollout tooling, directly improving data integrity and validation processes. These enhancements established a foundation for scalable rollout analytics and safer deployment workflows. The approach emphasized maintainability and reliability, consolidating changes to support more robust analytics and streamlined data validation within the codex project.