< Software Engineer, Apryse />

Guust Ysebie

Guust is a software engineer at Apryse, specializing in PDF technologies and the iText SDK for Java and .NET. With nearly seven years of experience in backend development, he works on core PDF internals, standards compliance (PDF/A, PDF/UA), and performance‑critical features used in enterprise document workflows. He contributes to the PDF Association, authors technical content, and has presented work at events like PDF Days Europe. When he's not deep in document structures, Guust enjoys climbing, surfing, and riding motorcycles.