Side Door Ventures | 1,125 followers on LinkedIn. Side Door Ventures is a global VC firm backing audacious founders building tomorrow’s life-changing companies. | Side Door Ventures is a global venture capital firm backing audacious founders building tomorrow’s life-changing companies. The Future Starts at the Fringe. We take a generalist approach and invest in companies across software, life sciences, space, deep tech, blockchain, logistics, gaming, media, security, food, and financial services that aim to transform industries and improve lives.