Anna Smirnova developed cross-language support for regulatory-compliant document formats in the diadoc/diadocsdk-csharp and diadoc/diadocsdk-java repositories, focusing on XML Proforma Invoices and XML Invoice Offers. She implemented new features in both C# and Java, updating protobuf definitions and code generation to enable seamless processing of these document types. Her work ensured compliance with regulation 29 and improved interoperability between systems. By aligning API changes and preparing sample files, Anna facilitated easier onboarding for customers integrating with either SDK. The depth of her engineering addressed both backend protocol alignment and practical integration needs, demonstrating strong skills in API integration and XML processing.