Nikola Djoric developed interoperability and build optimization features across the paritytech/polkadot-sdk and paritytech/foundry-polkadot repositories. He implemented a Web3 RPC endpoint in Rust, exposing client metadata to align with Ethereum tooling and improve integration workflows. In addition, Nikola enhanced CI/CD reliability by introducing binary caching and optimizing pipeline stability using GitHub Actions and Shell scripting. His work focused on reducing redundant builds, minimizing flaky test behavior, and standardizing metadata exposure, resulting in more reproducible builds and streamlined external integrations. Over two months, Nikola delivered two targeted features that addressed integration friction and CI efficiency, demonstrating depth in build systems and RPC.