OpenSooq is the #1 classifieds marketplace in MENA that connects buyers and sellers using mobile-first technologies. It has experienced exponential growth with over 20 million Android installs and consistently ranks in the top 100 iOS apps. OpenSooq's iOS app has a rating of 4.7 stars from nearly 150,000 reviews and its Android app has a 99% crash-free rate and high user engagement of 62 screens per session on average. The document discusses selecting optimal programming languages and technologies for OpenSooq's consumer platforms including iOS, Android, desktop, and a progressive web app for mobile/tablet to provide high performance experiences across different environments and device capabilities.