Jakub developed a configurable operation caching and Automatic Persisted Queries (APQ) feature for the grafbase/grafbase repository, focusing on backend development and configuration management. He integrated these capabilities into both the engine and gateway runtime, allowing users to enable or disable APQ and set operation cache size limits for flexible performance tuning. Using Rust and TOML, Jakub ensured the new configuration surface could be adjusted without code changes, supporting experimentation with caching strategies. His work laid the foundation for future optimization and cost control, addressing deployment resource management while maintaining stability and depth in the system’s core execution path.