Technology entrepreneurship can be seen as building upon while also deviating from technological paths. Such deviation has primarily been described as singular events where individuals with prior knowledge discover a new opportunity. In this article, we will instead study deviation as a process of collective decision making, seen more as something mindful than singular. The purpose is to explore mindful deviation as decision-making by nascent technology entrepreneurs as they conceptualize an early platform technology. Based on case assignments undertaken by 13 teams in a venture creation program, C-K design theory is used to trace how nascent technology entrepreneurs in action combine causal and effectual decision-making logics. Individually answered questionnaires also offered insights on how the entrepreneurs perceived their decision-making in hindsight. The findings break with our received wisdom around how opportunities are recognized as well as how effectual and causal logics occur. As a result, mindful deviation through combinations of effectual and causal logic is suggested as a means to understand early-stage technology entrepreneurship.