The adoption of lean product development (LPD) in knowledge intensive manufacturing contexts is bringing about profound consequences in terms of organizational forms and human resource management practices. Project-oriented units are increasingly overlapping with vertical arrangements and hierarchical distribution of work, which in the past rooted manufacturers in functionally oriented structures. In this paper we wish to address the issue of project manager competences in an LPD close-to-assembly line project, with the aim of understanding which competencies are considered as essential to get the job done, how they could be declined in a specific setting and what is the relationship between behavioural and technical competences. We locate our analysis in the automotive industry, since it represents one of the empirical settings where the discussion concerning the deployment of LPD and project competences occurs. We chose FCA, a multi-brand auto manufacturer whose product range covers different market segments, operating through companies located in 40 countries. Our research unfolds considering a single case study, as this approach was considered useful in gaining in-depth, holistic understanding of the phenomenon studied. Indeed, this method is more suitable for obtaining an in-depth understanding of complex phenomena, especially when the focus is on the social processes involved (Eisenhardt and Graebner, 2007), just as it is in our study. While in the traditional literature behavioural competences are essential and the technical ones are marginalised, this case shows how it is possible to look at the other way around. Behavioural competences are legitimized by and related to technical ones. Our results will show that while many organisations are stressing the behavioural dimension of competences, in certain contexts it is still fundamental to invest in terms of technical skills.