Kai Viertel

Co-Founder & CMO, SendSeven

Kai Viertel is Co-Founder & CMO at SendSeven. Previously, he spent seven years leading demand generation and social media at Sinch (formerly MessengerPeople), Europe's leading messaging platform. With 15+ years in digital marketing, including roles at ProSiebenSat.1 and communications agency fischerAppelt, he helps businesses get the most out of messenger communication for marketing, e-commerce, and customer service.

  • WhatsApp Business API
  • Multichannel Messaging
  • Customer Engagement
  • Demand Generation
  • B2B SaaS Marketing
  • Conversational Marketing
  • WhatsApp Newsletter
  • Omnichannel Strategy
  • Messenger Marketing
  • Co-Founder & CMO — SendSeven (2026–heute)
  • Head of Demand Generation & Social Media — Sinch (formerly MessengerPeople) (2018–2025)
  • Digital Marketing — ProSiebenSat.1 (2014–2018)
  • Communications & Digital — fischerAppelt (2010–2014)

Articles by Kai Viertel