Tiagra rear derailleurs have the same actuation ratio as Shimano 11 speed rear derailleurs, so you can use them with Tiagra 4700 10 speed shifters.
The cable pull on the shifters is different than an 11 speed, so this setup will only work on a 10 speed cassette.
The Tiagra 4700 rear derailleur works just fine, but you can replace it with a lighter one, or one with a Shadow+ clutch.
Speed
Shifters
Front derailleur