During June 2026, this developer focused on backend development for the safe-global/safe-client-gateway repository, building a Gas Tokens Retrieval API endpoint that enables clients to discover allowed gas tokens for specific chains. The implementation leveraged NestJS and TypeScript to create a scalable API surface, incorporating pagination to efficiently manage large token lists across multiple chains. Robust error handling was added to address invalid token requests, enhancing both reliability and developer experience. The work emphasized clean API design and maintainability, ensuring that the new endpoint integrates smoothly with existing infrastructure while supporting future scalability and ease of use for downstream consumers.