Purpose High-tech start-up creation is associated with complex challenges originating from quick transformations in technologies and markets. To raise start-up survival and success chances, founders need to ensure a rapid conversion of a venture idea into a working business. This paper aims to explore how identity-related characteristics of founders influence the speed of the start-up creation process. Design/methodology/approach For this study, a longitudinal multiple-case-study design was selected to identify a vivid flow of decisions and actions taken by high-tech start-ups for analysis in depth. Over 20 months, a series of interviews were organized with founders of six start-ups located in the same business incubator in Russia. Also, a set of additional data sources was engaged, including publicly available data and internal documents provided by businesses. Findings The findings reveal contrasting dynamics of start-up creation processes among founders with differing role identities. Identity fit and identity misfit are suggested to be serious pull and push factors in the process of organizational becoming through the impact they have on the situational regulatory focus of founders. Originality/value The current research contributes to the entrepreneurship stream of research by extending the knowledge of how cognition affects the process of new venture creation.