Worked on expanding multi-chain support in the argotorg/sourcify repository by integrating Soneium and WorldChain blockchains, focusing on robust API integration and blockchain development. Updated configuration files and RPC settings using TypeScript and JSON to enable contract verification and data fetching across new ecosystems. Enhanced end-to-end testing to ensure stable, predictable workflows and reduce chain-specific issues, aligning integrations with Etherscan and Alchemy providers. Improved test coverage and CI visibility, supporting scalable onboarding of additional blockchains. The work emphasized reliability and maintainability, allowing the platform to verify contracts on new chains and streamline onboarding for future blockchain integrations.