Sure. This particular project was 2 engineers working about 4 months from concept to shipping. One engineer had done iOS development since iOS 5 and was familiar with Swift and Obj-C and only vaguely familiar with JS, React and Redux. The other engineer came from a web background using mostly Angular 1.x and jQuery with no native mobile development experience.

Edit: 4 months because many novel solutions needed to be developed. Particularly a coarse indoor location that uses iBeacons and works without internet access and a statistics based learning audio player that alters content order based on what you have previously listened to.