Siem (CTO) is an experienced tech director with a demonstrated history of working in the internet industry with niche focus on data, data visualization and information designs.
As founder and executive director of Zimmerman he leads the technical team. Responsible for the first version of IATI.cloud -the current formal IATI Datastore- that helped the Dutch Ministry of Foreign affairs publish their IATI data to a web-based portal, making the Dutch government’s one of the early adaptors in the open data domain.
He has been instrumental in providing data services to major organizations working on data transparency, data accountability, data analysis and data visualization.
His work has led him to deliver data services in the last decade to The Global Fund, Dutch Ministry of Foreign Affairs, UNOPS, UNESCO, UN-Habitat, Aids fonds, The Department for International Development (DFID), Overseas Development institute and many more.
Skilled in Design, Business Development, Interaction Design, Software Development and Strategy.