Jan Joost Kalff is an angel investor and operator angel based in Netherlands. The known portfolio is one company, Katanox.
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Investment focus
- Stage
- Seed
- Sector
- Healthcare
- Focus
- Digital HealthHealthcare OperationsInteroperability
Contacts
Jan Joost Kalff portfolio company (1)
- Katanox
Investor Profile
The listing covers sector Healthcare, and focus areas Digital Health, Healthcare Operations and Interoperability. Startups operating in these areas may find Jan Joost Kalff relevant.
The stage tag on this profile is Seed.
The portfolio and focus above give founders context on whether Jan Joost Kalff matches their raise.
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Frequently asked questions
Who is Jan Joost Kalff?
Jan Joost Kalff is an angel investor and operator angel based in Netherlands with one known investment on file, Katanox. The sections above list the sectors and stages attached to that record.
What does Jan Joost Kalff invest in?
Listed sectors include Healthcare; listed focus areas include Digital Health, Healthcare Operations and Interoperability. Those tags come from the companies attached to this profile, so they read as a record of what has been backed rather than a stated preference for what comes next.
What stage does Jan Joost Kalff invest at?
The database lists Jan Joost Kalff for Seed rounds. Stage is the strongest single filter when you build a target list: an investor with no record at your stage rarely starts with you.
How do I contact Jan Joost Kalff?
An email address, a phone number and a LinkedIn page are on file for Jan Joost Kalff. The address stays masked on this page and is readable inside RaiseHunt after you create an account.
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Data: RaiseHunt investor dataset · Snapshot 6 September 2026 · How this data is built · Report a correction or request removal