Matthijs specialises in drafting and prosecuting patent applications in the fields of software, computer-implemented inventions, and internet-related technologies. He also has wider experience in a wide range of other technologies, including optical technologies, semiconductors, medical systems and telecommunication.

Matthijs regularly represents clients in oral proceedings at the European Patent Office, including opposition and appeal proceedings. He has also given presentations about intellectual property before a variety of audiences, including investors, and at scientific conferences.

Matthijs was awarded a DPhil from Oxford University for research in atomic and laser physics, and he published his thesis work on related to quantum computation in Science. As a post-doctoral research associate in Oxford, Matthijs worked on optical interactions in new nano-materials. Matthijs worked for a year at Philips Research on medical imaging.

Having grown up in the Netherlands, Matthijs speaks fluent Dutch and maintains many professional relationships there.

Matthijs has been recognised as a rising star by Managing Intellectual Property, IP Stars, 2018, and is a Notable Practitioner in the 2021 edition.