
Kostyantyn Rozenshtraus-Makarov took SendPulse to New York and learned how expensive a reluctant customer can be. His path from Chernihiv programmer to software co-founder runs through Brazil, shared offices and a habit of reconsidering the plan.

From chatbot flows to conference floors, the Ukrainian marketing executive has built a career around one practical question: how can a complicated system become useful to a real person?