Matija Salopek contributed to the cosmos/interchain-security and cosmos/gaia repositories by delivering features that improved documentation usability and system reliability. He implemented searchable documentation using Docusaurus and JavaScript, enabling users to efficiently find information, and extended validator unjail functionality for pre-CCV networks in Go, ensuring robust test coverage and maintainable code. In cosmos/gaia, Matija focused on build stability by upgrading key dependencies, updating Dockerfiles, and refining CI workflows to enhance deployment consistency and security. His work demonstrated depth in backend and blockchain development, with careful attention to documentation, testing, and the operational impact of each change.