Pop-up shop service co-founder envisions free shop space for brands and entrepreneurs – landlords could recoup investment with commissions Six years ago, Mohamed Haouache left Wall Street after working as an investment banker for nearly 10 years. He jumped into the technology world in 2014 and founded Oui Open, an online platform to directly connect landlords and brands, designers and entrepreneurs, with an ambition to optimise use of retail space and make it easy and cheaper to find short-term leases.