Aleksandr Kuryshev developed and integrated new backend features for the Ecwid/ecwid-java-api-client repository, focusing on customer data retrieval and electronic invoicing support. He implemented a customer-facing API in Kotlin that enables efficient retrieval of a customer’s most recent order by email, streamlining support workflows and ensuring clear traceability through concise commits. In addition, Aleksandr extended the data model to support electronic invoicing compliance by adding PEC email, SDI code, and tax fields, enhancing B2B order data fidelity. His work demonstrated strong skills in API development, backend engineering, and data modeling, delivering robust, maintainable solutions without introducing new bugs.