Matija Salopek contributed to the cosmos/interchain-security and cosmos/gaia repositories by delivering features focused on documentation discoverability, validator functionality, and build stability. He implemented searchable documentation using Docusaurus and JavaScript, enhancing onboarding and support efficiency. For validator operations, he extended unjail support to pre-CCV networks in Go, refining logic to interact with standalone staking modules and updating test coverage for reliability. In cosmos/gaia, Matija managed dependency upgrades, updating Dockerfiles and CI workflows to ensure compatibility and reproducibility. His work demonstrated depth in backend development, blockchain systems, and build automation, resulting in maintainable code and improved operational readiness.