Worked on the martinvonz/jj repository to implement dynamic configuration lookup within the config() template function, enabling retrieval of configuration values using dynamic, key-based expressions. This feature was achieved by introducing Stringify support, which allowed template parsing logic to handle dynamic keys and improved the flexibility of configuration management. The work included updating documentation and providing practical examples, such as retrieving configuration values with dynamically constructed keys. Utilizing Rust for both programming and template development, the changes addressed a specific issue to enhance reliability and maintainability, aligning the solution with business objectives and demonstrating technical depth in dynamic configuration management.