Yonatan Appel

Co-Founder & CTO at Upstream Security

Yonatan is leading Upstream's product development, bringing 20 years of technology development and product management experience in industry-leading multinational companies. He brings deep experience in cybersecurity innovation in world-leading application security companies such as Check Point and Imperva, as well as experience in developing enterprise-grade cloud-based analytics technologies in Microsoft. He also served in an elite technological unit in the IDF Intelligence Corps. Yonatan holds a BA in Computer Science from the Open University of Israel (cum laude), and an LLB from Tel Aviv University.


Previous companies

Check Point logo
Microsoft logo
Imperva logo


  • Co-Founder & CTO

    Current role

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