These interviews took place behind the scenes and introduce the protagonists and their startups in more detail. Petar Stefanov is CTO and co-founder of Spectroplast. http://www.spectroplast.com. Interviews are also available as a podcast: https://www.startup-documentary.com/podcast.

Full interview

Podcast link

Short clips from the interview

Still

Still interview Petar Stefanov, Spectroplast, from Start-up, a film by Manuel Stagars