Ermal Kaleci developed advanced cross-contract interoperability features for the paritytech/polkadot-sdk and paritytech/revive repositories, focusing on delegate_call capabilities within the PolkaVM environment. He implemented address-based delegate_call targeting with configurable resource limits, updating execution logic, fixtures, and benchmarking to support flexible contract orchestration and safer resource usage. Using Rust and Solidity, Ermal expanded integration tests and runtime API exposure, ensuring robust validation and reliable rollouts. His work addressed the need for more dynamic smart contract execution while preserving caller context, demonstrating depth in low-level programming and smart contract development. The features delivered enable faster iteration and stronger ecosystem tooling.