Job Description :
Having Objective-C and Swift experience is a MUST.
Client is using more Objective-C than Swift at this moment.
All new features that are being built are in Swift, and down the road the environment will be 50% Obj-C, 50% Swift.
They are on Swift v.3 right now, moving to v.4 soon.

They are doing transition from Objective C to Swift 3 / 4.