Worked on the tkhq/sdk repository to deliver two foundational features focused on security and user experience in Web3 development. Developed an embedded key non-extractable security mechanism, introducing a flag-based guard to prevent key extraction and refining the design to ensure correctness and auditability. Established the groundwork for a gasless transactions framework, implementing ABI utilities, sample transaction logic, and enhanced nonce handling to support delegated transfers, particularly for USDC. Leveraged TypeScript, Ethers.js, and smart contract development skills to improve cross-contract interoperability and observability, enabling streamlined integration paths for partners and laying a robust foundation for future SDK enhancements.