Michal Sokolowski developed runtime configuration file support for stack deployment and preview in the spacelift-io/spacectl repository. He introduced a new CLI flag to accept user-defined runtime configuration files, encapsulated settings in a dedicated input struct, and updated the run trigger logic to read and pass these configurations to the GraphQL mutation layer. This work, implemented in Go, focused on enhancing deployment flexibility and reproducibility by allowing users to specify environment-specific settings without manual intervention. Michal’s contributions leveraged his skills in CLI development, configuration management, and GraphQL integration, delivering a targeted feature that streamlines and standardizes stack operations for end users.