• Developed converter EMF to PDF converter to improve quality of PDF export (previously EMF image were converted to bitmaps on export) in the products that support embedding EMF files (e.g. Rich Edit, Spreadsheet, Repots).• Implemented API for adding accessibility information in the generated PDF files for various DevExpress products (Rich Edit, Spreadsheet, Repots).• Developed API for automatic generation of the PDF signature visual appearance.• Developed of UI for the PDF Viewer (comments panel and UI for text markup annotations manipulation (e.g. highlight, underline text)).• Implemented text layout engine to format Unicode text (with multiline bidirectional text, script specific shaping, soft hyphens, tab stops and text trimming support).• Improved Office File API cross-platform support by adding complex text layout support for Linux (via FontConfig, HarfBuzz, LibICU, FreeType libraries) and Azure (via DirectWrite since Azure doesn't support GDI API).• Implemented multiple digital signatures creation in PDF files.• Designed and developed API for adding PAdES signatures, TSA timestamps and LTV related information to PDF files.• Developed Skia based PDF renderer for PDF Document API.

• Developed Direct2D, DirectWrite and Direct3D based PDF renderer for PDF Viewer and Office File API.• Worked with the WPF team to develop Visual to PDF converter to improve quality of PDF exported by DevExpress WPF controls.• Designed and developed DirectX wrappers for COM Interop (since built-in COM Interop has a few issues which make it unusable in our case).• Implemented GUI for text markup annotations manipulation (e.g. highlight, underline text) for PDFViewer.• Developed image rendering pipeline that able to process very large images (by processing them without decoding whole image to the memory).• Ported Office File API to .NET Core.• Developed demo applications for .Net Core and ASP.NET Core MVC.

• Developed various feature (e.g. EMF+ export) for PDF export engine used in Office File API and other products that supports export to PDF.• Improved PDF renderer (support JPX images and Type3 fonts rendering).